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Add write watermarks to filtered bufferevents.

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This commit is contained in:
Nick Mathewson 2011-08-24 17:18:25 -04:00
parent 59d0f750c9
commit f186e16241
2 changed files with 12 additions and 2 deletions
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9
changes/bug3804
View File

@ -1,4 +1,9 @@
o Major bugfixes (bufferevents):
- Apply rate-limiting only at the bottom of a chain of filtering
bufferevents. This prevents us from filling up internal memory
buffers. Bugfix on 0.2.3.1-alpha; fixes bug 3804.
bufferevents. This prevents us from filling up internal read
buffers and violating rate-limits when filtering bufferevents
are enabled. Bugfix on 0.2.3.1-alpha; fixes part of bug 3804.
- Add high-watermarks to the output buffers for filtered
bufferevents. This prevents us from filling up internal write
buffers and wasting CPU cycles when filtering bufferevents are
enabled. Bugfix on 0.2.3.1-alpha; fixes part of bug 3804.

5
src/common/tortls.c
View File

@ -51,6 +51,7 @@
#ifdef USE_BUFFEREVENTS
#include <event2/bufferevent_ssl.h>
#include <event2/buffer.h>
#include <event2/event.h>
#include "compat_libevent.h"
#endif
@ -1905,6 +1906,10 @@ tor_tls_init_bufferevent(tor_tls_t *tls, struct bufferevent *bufev_in,
state,
BEV_OPT_DEFER_CALLBACKS|
BEV_OPT_CLOSE_ON_FREE);
/* Tell the underlying bufferevent when to accept more data from the SSL
filter (only when it's got less than 32K to write), and when to notify
the SSL filter that it could write more (when it drops under 24K). */
bufferevent_setwatermark(bufev_in, EV_WRITE, 24*1024, 32*1024);
} else {
if (bufev_in) {
evutil_socket_t s = bufferevent_getfd(bufev_in);