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Add a separate set of token buckets for relayed traffic. Right
now that's just defined as answers to directory requests. svn:r9881
This commit is contained in:
Roger Dingledine
parent
4ab0b979b2
commit
b4f743562f
17
doc/tor.1.in
17
doc/tor.1.in
@ -65,8 +65,7 @@ bandwidth usage to that same value. (Default: 3 MB)
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.TP
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\fBBandwidthBurst \fR\fIN\fR \fBbytes\fR|\fBKB\fR|\fBMB\fR|\fBGB\fR|\fBTB\fP
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Limit the maximum token bucket size (also known as the burst) to the
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given number of bytes in each direction. This value should be at least
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twice your BandwidthRate. (Default: 6 MB)
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given number of bytes in each direction. (Default: 6 MB)
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.LP
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.TP
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\fBMaxAdvertisedBandwidth \fR\fIN\fR \fBbytes\fR|\fBKB\fR|\fBMB\fR|\fBGB\fR|\fBTB\fP
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@ -77,6 +76,20 @@ advertised bandwidth rate) can thus reduce the CPU demands on their
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server without impacting network performance.
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.LP
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.TP
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\fBRelayBandwidthRate \fR\fIN\fR \fBbytes\fR|\fBKB\fR|\fBMB\fR|\fBGB\fR|\fBTB\fP
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If defined, a separate token bucket limits the average incoming bandwidth
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usage for _relayed traffic_ on this node to the specified number of
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bytes per second, and the average outgoing bandwidth usage to that same
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value. Relayed traffic is currently defined as answers to directory
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requests, but that may change. (Default: 0)
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.LP
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.TP
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\fBRelayBandwidthBurst \fR\fIN\fR \fBbytes\fR|\fBKB\fR|\fBMB\fR|\fBGB\fR|\fBTB\fP
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Limit the maximum token bucket size (also known as the burst) for
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_relayed traffic_ to the
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given number of bytes in each direction. (Default: 0)
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.LP
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.TP
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\fBConnLimit \fR\fINUM\fP
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The minimum number of file descriptors that must be available to
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the Tor process before it will start. Tor will ask the OS for as
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@ -216,6 +216,8 @@ static config_var_t _option_vars[] = {
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VAR("RecommendedClientVersions", LINELIST, RecommendedClientVersions, NULL),
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VAR("RecommendedServerVersions", LINELIST, RecommendedServerVersions, NULL),
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VAR("RedirectExit", LINELIST, RedirectExit, NULL),
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VAR("RelayBandwidthBurst", MEMUNIT, RelayBandwidthBurst, "0"),
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VAR("RelayBandwidthRate", MEMUNIT, RelayBandwidthRate, "0"),
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VAR("RendExcludeNodes", STRING, RendExcludeNodes, NULL),
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VAR("RendNodes", STRING, RendNodes, NULL),
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VAR("RendPostPeriod", INTERVAL, RendPostPeriod, "1 hour"),
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@ -2666,6 +2668,19 @@ options_validate(or_options_t *old_options, or_options_t *options,
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*msg = tor_strdup(r >= 0 ? buf : "internal error");
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return -1;
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}
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if (options->RelayBandwidthRate > options->RelayBandwidthBurst)
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REJECT("RelayBandwidthBurst must be at least equal "
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"to RelayBandwidthRate.");
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if (options->RelayBandwidthRate &&
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options->RelayBandwidthRate < ROUTER_REQUIRED_MIN_BANDWIDTH) {
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r = tor_snprintf(buf, sizeof(buf),
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"RelayBandwidthRate is set to %d bytes/second. "
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"For servers, it must be at least %d.",
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(int)options->RelayBandwidthRate,
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ROUTER_REQUIRED_MIN_BANDWIDTH);
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*msg = tor_strdup(r >= 0 ? buf : "internal error");
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return -1;
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}
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}
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if (options->BandwidthRate > options->BandwidthBurst)
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@ -1105,11 +1105,28 @@ connection_is_rate_limited(connection_t *conn)
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}
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extern int global_read_bucket, global_write_bucket;
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extern int global_relayed_read_bucket, global_relayed_write_bucket;
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/** Did our global write bucket run dry last second? If so, we are
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* likely to run dry again this second, so be stingy with the tokens
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* we just put in. */
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static int global_write_bucket_empty_last_second = 0;
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/** Did our either global write bucket run dry last second? If so,
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* we are likely to run dry again this second, so be stingy with the
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* tokens we just put in. */
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static int write_buckets_empty_last_second = 0;
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/** Return 1 if <b>conn</b> should use tokens from the "relayed"
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* bandwidth rates, else 0. Currently, only OR conns with bandwidth
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* class 1, and directory conns that are serving data out, count.
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*/
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static int
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connection_counts_as_relayed_traffic(connection_t *conn)
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{
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#if 0
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if (conn->type == CONN_TYPE_OR && TO_OR_CONN(conn)->bandwidth_class)
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return 1;
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#endif
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if (conn->type == CONN_TYPE_DIR && DIR_CONN_IS_SERVER(conn))
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return 1;
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return 0;
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}
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/** Helper function to decide how many bytes out of <b>global_bucket</b>
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* we're willing to use for this transaction. <b>base</b> is the size
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@ -1153,16 +1170,25 @@ connection_bucket_read_limit(connection_t *conn)
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CELL_NETWORK_SIZE : RELAY_PAYLOAD_SIZE;
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int priority = conn->type != CONN_TYPE_DIR;
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int conn_bucket = -1;
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if (connection_speaks_cells(conn) && conn->state == OR_CONN_STATE_OPEN) {
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int global_bucket = global_read_bucket;
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if (connection_speaks_cells(conn)) {
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or_connection_t *or_conn = TO_OR_CONN(conn);
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conn_bucket = or_conn->read_bucket;
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if (conn->state == OR_CONN_STATE_OPEN)
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conn_bucket = or_conn->read_bucket;
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}
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if (!connection_is_rate_limited(conn)) {
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/* be willing to read on local conns even if our buckets are empty */
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return conn_bucket>=0 ? conn_bucket : 1<<14;
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}
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if (connection_counts_as_relayed_traffic(conn) &&
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global_relayed_read_bucket <= global_read_bucket)
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global_bucket = global_relayed_read_bucket;
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return connection_bucket_round_robin(base, priority,
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global_read_bucket, conn_bucket);
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global_bucket, conn_bucket);
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}
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/** How many bytes at most can we write onto this connection? */
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@ -1172,24 +1198,31 @@ connection_bucket_write_limit(connection_t *conn)
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int base = connection_speaks_cells(conn) ?
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CELL_NETWORK_SIZE : RELAY_PAYLOAD_SIZE;
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int priority = conn->type != CONN_TYPE_DIR;
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int global_bucket = global_write_bucket;
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if (!connection_is_rate_limited(conn)) {
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/* be willing to write to local conns even if our buckets are empty */
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return conn->outbuf_flushlen;
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}
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return connection_bucket_round_robin(base, priority, global_write_bucket,
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if (connection_counts_as_relayed_traffic(conn) &&
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global_relayed_write_bucket <= global_write_bucket)
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global_bucket = global_relayed_write_bucket;
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return connection_bucket_round_robin(base, priority, global_bucket,
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conn->outbuf_flushlen);
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}
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/** Return 1 if the global write bucket is low enough that we shouldn't
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* send <b>attempt</b> bytes of low-priority directory stuff out to
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* <b>conn</b>. Else return 0.
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/** Return 1 if the global write buckets are low enough that we
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* shouldn't send <b>attempt</b> bytes of low-priority directory stuff
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* out to <b>conn</b>. Else return 0.
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* Priority is 1 for v1 requests (directories and running-routers),
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* and 2 for v2 requests (statuses and descriptors). But see FFFF in
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* directory_handle_command_get() for why we don't use priority 2 yet.
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*
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* There are a lot of parameters we could use here:
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* - global_relayed_write_bucket. Low is bad.
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* - global_write_bucket. Low is bad.
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* - bandwidthrate. Low is bad.
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* - bandwidthburst. Not a big factor?
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@ -1203,22 +1236,26 @@ connection_bucket_write_limit(connection_t *conn)
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int
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global_write_bucket_low(connection_t *conn, size_t attempt, int priority)
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{
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int smaller_bucket = global_write_bucket < global_relayed_write_bucket ?
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global_write_bucket : global_relayed_write_bucket;
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if (authdir_mode(get_options()) && priority>1)
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return 0; /* there's always room to answer v2 if we're an auth dir */
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if (!connection_is_rate_limited(conn))
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return 0; /* local conns don't get limited */
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if (global_write_bucket < (int)attempt)
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if (smaller_bucket < (int)attempt)
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return 1; /* not enough space no matter the priority */
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if (global_write_bucket_empty_last_second)
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if (write_buckets_empty_last_second)
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return 1; /* we're already hitting our limits, no more please */
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if (priority == 1) { /* old-style v1 query */
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/* Could we handle *two* of these requests within the next two seconds? */
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int64_t can_write = (int64_t)global_write_bucket
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+ 2*get_options()->BandwidthRate;
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or_options_t *options = get_options();
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int64_t can_write = (int64_t)smaller_bucket
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+ 2*(options->RelayBandwidthRate ? options->RelayBandwidthRate :
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options->BandwidthRate);
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if (can_write < 2*(int64_t)attempt)
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return 1;
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} else { /* v2 query */
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@ -1227,14 +1264,28 @@ global_write_bucket_low(connection_t *conn, size_t attempt, int priority)
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return 0;
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}
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/** We just read num_read onto conn. Decrement buckets appropriately. */
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/** We just read num_read and wrote num_written onto conn.
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* Decrement buckets appropriately. */
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static void
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connection_read_bucket_decrement(connection_t *conn, int num_read)
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connection_buckets_decrement(connection_t *conn, time_t now,
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int num_read, int num_written)
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{
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global_read_bucket -= num_read;
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if (connection_speaks_cells(conn) && conn->state == OR_CONN_STATE_OPEN) {
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TO_OR_CONN(conn)->read_bucket -= num_read;
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if (!connection_is_rate_limited(conn))
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return; /* local IPs are free */
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if (num_read > 0)
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rep_hist_note_bytes_read(num_read, now);
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if (num_written > 0)
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rep_hist_note_bytes_written(num_written, now);
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if (connection_counts_as_relayed_traffic(conn)) {
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global_relayed_read_bucket -= num_read;
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global_relayed_write_bucket -= num_written;
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}
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global_read_bucket -= num_read;
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global_write_bucket -= num_written;
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if (connection_speaks_cells(conn) && conn->state == OR_CONN_STATE_OPEN)
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TO_OR_CONN(conn)->read_bucket -= num_read;
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}
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/** If we have exhausted our global buckets, or the buckets for conn,
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@ -1242,21 +1293,23 @@ connection_read_bucket_decrement(connection_t *conn, int num_read)
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static void
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connection_consider_empty_read_buckets(connection_t *conn)
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{
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const char *reason;
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if (global_read_bucket <= 0) {
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LOG_FN_CONN(conn, (LOG_DEBUG,LD_NET,
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"global read bucket exhausted. Pausing."));
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conn->wants_to_read = 1;
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connection_stop_reading(conn);
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return;
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}
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if (connection_speaks_cells(conn) &&
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conn->state == OR_CONN_STATE_OPEN &&
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TO_OR_CONN(conn)->read_bucket <= 0) {
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LOG_FN_CONN(conn,
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(LOG_DEBUG,LD_NET,"read bucket exhausted. Pausing."));
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conn->wants_to_read = 1;
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connection_stop_reading(conn);
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}
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reason = "global read bucket exhausted. Pausing.";
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} else if (connection_counts_as_relayed_traffic(conn) &&
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global_relayed_read_bucket <= 0) {
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reason = "global relayed read bucket exhausted. Pausing.";
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} else if (connection_speaks_cells(conn) &&
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conn->state == OR_CONN_STATE_OPEN &&
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TO_OR_CONN(conn)->read_bucket <= 0) {
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reason = "connection read bucket exhausted. Pausing.";
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} else
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return; /* all good, no need to stop it */
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LOG_FN_CONN(conn, (LOG_DEBUG, LD_NET, "%s", reason));
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conn->wants_to_read = 1;
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connection_stop_reading(conn);
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}
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/** If we have exhausted our global buckets, or the buckets for conn,
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@ -1264,26 +1317,28 @@ connection_consider_empty_read_buckets(connection_t *conn)
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static void
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connection_consider_empty_write_buckets(connection_t *conn)
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{
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const char *reason;
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if (global_write_bucket <= 0) {
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LOG_FN_CONN(conn, (LOG_DEBUG,LD_NET,
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"global write bucket exhausted. Pausing."));
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conn->wants_to_write = 1;
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connection_stop_writing(conn);
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return;
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}
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reason = "global write bucket exhausted. Pausing.";
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} else if (connection_counts_as_relayed_traffic(conn) &&
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global_relayed_write_bucket <= 0) {
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reason = "global relayed write bucket exhausted. Pausing.";
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#if 0
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if (connection_speaks_cells(conn) &&
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conn->state == OR_CONN_STATE_OPEN &&
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TO_OR_CONN(conn)->write_bucket <= 0) {
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LOG_FN_CONN(conn,
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(LOG_DEBUG,LD_NET,"write bucket exhausted. Pausing."));
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conn->wants_to_write = 1;
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connection_stop_writing(conn);
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}
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} else if (connection_speaks_cells(conn) &&
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conn->state == OR_CONN_STATE_OPEN &&
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TO_OR_CONN(conn)->write_bucket <= 0) {
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reason = "connection write bucket exhausted. Pausing.";
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#endif
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} else
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return; /* all good, no need to stop it */
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LOG_FN_CONN(conn, (LOG_DEBUG, LD_NET, "%s", reason));
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conn->wants_to_write = 1;
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connection_stop_writing(conn);
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}
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/** Initialize the global read bucket to options->BandwidthBurst. */
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/** Initialize the global read bucket to options-\>BandwidthBurst. */
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void
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connection_bucket_init(void)
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{
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@ -1291,8 +1346,28 @@ connection_bucket_init(void)
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/* start it at max traffic */
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global_read_bucket = (int)options->BandwidthBurst;
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global_write_bucket = (int)options->BandwidthBurst;
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if (options->RelayBandwidthRate) {
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global_relayed_read_bucket = (int)options->RelayBandwidthBurst;
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global_relayed_write_bucket = (int)options->RelayBandwidthBurst;
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} else {
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global_relayed_read_bucket = (int)options->BandwidthBurst;
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global_relayed_write_bucket = (int)options->BandwidthBurst;
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}
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}
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static void
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connection_bucket_refill_helper(int *bucket, int rate, int burst,
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int seconds_elapsed, const char *name)
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{
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if (*bucket < burst) {
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*bucket += rate*seconds_elapsed;
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if (*bucket > burst)
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*bucket = burst;
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log(LOG_DEBUG, LD_NET,"%s now %d.", name, *bucket);
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}
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}
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/** A second has rolled over; increment buckets appropriately. */
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void
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connection_bucket_refill(int seconds_elapsed)
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@ -1301,23 +1376,36 @@ connection_bucket_refill(int seconds_elapsed)
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connection_t *conn;
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connection_t **carray;
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or_options_t *options = get_options();
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int relayrate, relayburst;
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if (options->RelayBandwidthRate) {
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relayrate = (int)options->RelayBandwidthRate;
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relayburst = (int)options->RelayBandwidthBurst;
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} else {
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relayrate = (int)options->BandwidthRate;
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relayburst = (int)options->BandwidthBurst;
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}
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tor_assert(seconds_elapsed >= 0);
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write_buckets_empty_last_second =
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global_relayed_write_bucket == 0 || global_write_bucket == 0;
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/* refill the global buckets */
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if (global_read_bucket < (int)options->BandwidthBurst) {
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global_read_bucket += (int)options->BandwidthRate*seconds_elapsed;
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if (global_read_bucket > (int)options->BandwidthBurst)
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global_read_bucket = (int)options->BandwidthBurst;
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log(LOG_DEBUG, LD_NET,"global_read_bucket now %d.", global_read_bucket);
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}
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if (global_write_bucket < (int)options->BandwidthBurst) {
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global_write_bucket_empty_last_second = global_write_bucket == 0;
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global_write_bucket += (int)options->BandwidthRate*seconds_elapsed;
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if (global_write_bucket > (int)options->BandwidthBurst)
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global_write_bucket = (int)options->BandwidthBurst;
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log(LOG_DEBUG, LD_NET,"global_write_bucket now %d.", global_write_bucket);
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}
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connection_bucket_refill_helper(&global_read_bucket,
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(int)options->BandwidthRate,
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(int)options->BandwidthBurst,
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seconds_elapsed, "global_read_bucket");
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connection_bucket_refill_helper(&global_write_bucket,
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(int)options->BandwidthRate,
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(int)options->BandwidthBurst,
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seconds_elapsed, "global_write_bucket");
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connection_bucket_refill_helper(&global_relayed_read_bucket,
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relayrate, relayburst, seconds_elapsed,
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"global_relayed_read_bucket");
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connection_bucket_refill_helper(&global_relayed_write_bucket,
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relayrate, relayburst, seconds_elapsed,
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"global_relayed_write_bucket");
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/* refill the per-connection buckets */
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get_connection_array(&carray,&n);
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@ -1337,19 +1425,25 @@ connection_bucket_refill(int seconds_elapsed)
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if (conn->wants_to_read == 1 /* it's marked to turn reading back on now */
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&& global_read_bucket > 0 /* and we're allowed to read */
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&& (!connection_counts_as_relayed_traffic(conn) ||
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global_relayed_read_bucket > 0) /* even if we're relayed traffic */
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&& (!connection_speaks_cells(conn) ||
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conn->state != OR_CONN_STATE_OPEN ||
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TO_OR_CONN(conn)->read_bucket > 0)) {
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/* and either a non-cell conn or a cell conn with non-empty bucket */
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LOG_FN_CONN(conn, (LOG_DEBUG,LD_NET,
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"waking up conn (fd %d) for read",conn->s));
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||||
"waking up conn (fd %d) for read", conn->s));
|
||||
conn->wants_to_read = 0;
|
||||
connection_start_reading(conn);
|
||||
}
|
||||
if (conn->wants_to_write == 1 &&
|
||||
global_write_bucket > 0) { /* and we're allowed to write */
|
||||
|
||||
if (conn->wants_to_write == 1
|
||||
&& global_write_bucket > 0 /* and we're allowed to write */
|
||||
&& (!connection_counts_as_relayed_traffic(conn) ||
|
||||
global_relayed_write_bucket > 0)) {
|
||||
/* even if we're relayed traffic */
|
||||
LOG_FN_CONN(conn, (LOG_DEBUG,LD_NET,
|
||||
"waking up conn (fd %d) for write",conn->s));
|
||||
"waking up conn (fd %d) for write", conn->s));
|
||||
conn->wants_to_write = 0;
|
||||
connection_start_writing(conn);
|
||||
}
|
||||
@ -1561,18 +1655,7 @@ connection_read_to_buf(connection_t *conn, int *max_to_read)
|
||||
edge_conn->n_read += n_read;
|
||||
}
|
||||
|
||||
if (connection_is_rate_limited(conn)) {
|
||||
/* For non-local IPs, remember if we flushed any bytes over the wire. */
|
||||
time_t now = time(NULL);
|
||||
if (n_read > 0) {
|
||||
rep_hist_note_bytes_read(n_read, now);
|
||||
connection_read_bucket_decrement(conn, n_read);
|
||||
}
|
||||
if (n_written > 0) {
|
||||
rep_hist_note_bytes_written(n_written, now);
|
||||
global_write_bucket -= n_written;
|
||||
}
|
||||
}
|
||||
connection_buckets_decrement(conn, time(NULL), n_read, n_written);
|
||||
|
||||
if (more_to_read && result == at_most) {
|
||||
bytes_in_buf = buf_capacity(conn->inbuf) - buf_datalen(conn->inbuf);
|
||||
@ -1762,18 +1845,7 @@ connection_handle_write(connection_t *conn, int force)
|
||||
edge_conn->n_written += n_written;
|
||||
}
|
||||
|
||||
if (connection_is_rate_limited(conn)) {
|
||||
/* For non-local IPs, remember if we flushed any bytes over the wire. */
|
||||
time_t now = time(NULL);
|
||||
if (n_written > 0) {
|
||||
rep_hist_note_bytes_written(n_written, now);
|
||||
global_write_bucket -= n_written;
|
||||
}
|
||||
if (n_read > 0) {
|
||||
rep_hist_note_bytes_read(n_read, now);
|
||||
connection_read_bucket_decrement(conn, n_read);
|
||||
}
|
||||
}
|
||||
connection_buckets_decrement(conn, time(NULL), n_read, n_written);
|
||||
|
||||
if (result > 0) {
|
||||
/* If we wrote any bytes from our buffer, then call the appropriate
|
||||
|
||||
@ -34,12 +34,18 @@ static int conn_close_if_marked(int i);
|
||||
int global_read_bucket; /**< Max number of bytes I can read this second. */
|
||||
int global_write_bucket; /**< Max number of bytes I can write this second. */
|
||||
|
||||
/** Max number of relayed (bandwidth class 1) bytes I can read this second. */
|
||||
int global_relayed_read_bucket;
|
||||
/** Max number of relayed (bandwidth class 1) bytes I can write this second. */
|
||||
int global_relayed_write_bucket;
|
||||
|
||||
/** What was the read bucket before the last call to prepare_for_pool?
|
||||
* (used to determine how many bytes we've read). */
|
||||
static int stats_prev_global_read_bucket;
|
||||
/** What was the write bucket before the last call to prepare_for_pool?
|
||||
* (used to determine how many bytes we've written). */
|
||||
static int stats_prev_global_write_bucket;
|
||||
/* XXX we might want to keep stats about global_relayed_*_bucket too. Or not.*/
|
||||
/** How many bytes have we read/written since we started the process? */
|
||||
static uint64_t stats_n_bytes_read = 0;
|
||||
static uint64_t stats_n_bytes_written = 0;
|
||||
|
||||
@ -804,7 +804,7 @@ typedef struct or_connection_t {
|
||||
int n_circuits; /**< How many circuits use this connection as p_conn or
|
||||
* n_conn ? */
|
||||
struct or_connection_t *next_with_same_id; /**< Next connection with same
|
||||
* identity digest as this one. */
|
||||
* identity digest as this one. */
|
||||
/** Linked list of bridged dirserver connections that can't write until
|
||||
* this connection's outbuf is less full. */
|
||||
struct dir_connection_t *blocked_dir_connections;
|
||||
@ -1697,6 +1697,10 @@ typedef struct {
|
||||
* to use in a second? */
|
||||
uint64_t MaxAdvertisedBandwidth; /**< How much bandwidth are we willing to
|
||||
* tell people we have? */
|
||||
uint64_t RelayBandwidthRate; /**< How much bandwidth, on average, are we
|
||||
* willing to use for all relayed conns? */
|
||||
uint64_t RelayBandwidthBurst; /**< How much bandwidth, at maximum, will we
|
||||
* use in a second for all relayed conns? */
|
||||
int NumCpus; /**< How many CPUs should we try to use? */
|
||||
int RunTesting; /**< If true, create testing circuits to measure how well the
|
||||
* other ORs are running. */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user