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new link padding scheme

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we're now much more robust when bandwidth varies: instead of forcing a
fixed bandwidth on the link, we instead use what the link will give us,
up to our bandwidth.


svn:r53
This commit is contained in:
Roger Dingledine 2002-07-16 18:24:12 +00:00
parent 53cec4caef
commit ccdef66b68
2 changed files with 21 additions and 7 deletions
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18
src/or/connection.c
View File

@ -364,6 +364,10 @@ int connection_state_is_open(connection_t *conn) {
void connection_send_cell(connection_t *conn) {
cell_t cell;
int bytes_in_full_flushlen;
/* this function only gets called if options.LinkPadding is 1 */
assert(options.LinkPadding == 1);
assert(conn);
@ -385,7 +389,17 @@ void connection_send_cell(connection_t *conn) {
}
#endif
#if 1 /* experimental code, that sends padding cells too. 'probably' works :) */
connection_increment_send_timeval(conn); /* update when we'll send the next cell */
bytes_in_full_flushlen = conn->bandwidth / 100; /* 10ms worth */
if(bytes_in_full_flushlen < 10*sizeof(cell_t))
bytes_in_full_flushlen = 10*sizeof(cell_t); /* but at least 10 cells worth */
if(conn->outbuf_flushlen > bytes_in_full_flushlen - sizeof(cell_t)) {
/* if we would exceed bytes_in_full_flushlen by adding a new cell */
return;
}
if(conn->outbuf_datalen - conn->outbuf_flushlen < sizeof(cell_t)) {
/* we need to queue a padding cell first */
memset(&cell,0,sizeof(cell_t));
@ -395,9 +409,7 @@ void connection_send_cell(connection_t *conn) {
conn->outbuf_flushlen += sizeof(cell_t); /* instruct it to send a cell */
connection_watch_events(conn, POLLOUT | POLLIN);
#endif
connection_increment_send_timeval(conn); /* update when we'll send the next cell */
}
void connection_increment_send_timeval(connection_t *conn) {

10
src/or/main.c
View File

@ -344,10 +344,10 @@ int prepare_for_poll(int *timeout) {
if(!connection_state_is_open(tmpconn))
continue; /* only conns in state 'open' have a valid send_timeval */
while(tv_cmp(&tmpconn->send_timeval,&now) <= 0) { /* send_timeval has already passed, let it send a cell */
log(LOG_DEBUG,"prepare_for_poll(): doing backlogged connection_send_cell on socket %d (%d ms old)",tmpconn->s,
(now.tv_sec - tmpconn->send_timeval.tv_sec)*1000 +
(now.tv_usec - tmpconn->send_timeval.tv_usec)/1000
);
// log(LOG_DEBUG,"prepare_for_poll(): doing backlogged connection_send_cell on socket %d (%d ms old)",tmpconn->s,
// (now.tv_sec - tmpconn->send_timeval.tv_sec)*1000 +
// (now.tv_usec - tmpconn->send_timeval.tv_usec)/1000
// );
connection_send_cell(tmpconn);
}
if(!conn || tv_cmp(&tmpconn->send_timeval, &soonest) < 0) { /* this is the best choice so far */
@ -424,11 +424,13 @@ int do_main_loop(void) {
/* poll until we have an event, or it's time to do something */
poll_result = poll(poll_array, nfds, timeout);
#if 0 /* let catch() handle things like ^c, and otherwise don't worry about it */
if(poll_result < 0) {
log(LOG_ERR,"do_main_loop(): poll failed.");
if(errno != EINTR) /* let the program survive things like ^z */
return -1;
}
#endif
if(poll_result > 0) { /* we have at least one connection to deal with */
/* do all the reads first, so we can detect closed sockets */