commit f186e16241f7d6a0090260f87ce412a0fb7ec47a Author: Nick Mathewson nickm@torproject.org Date: Wed Aug 24 17:18:25 2011 -0400

Add write watermarks to filtered bufferevents. --- changes/bug3804 | 9 +++++++-- src/common/tortls.c | 5 +++++ 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/changes/bug3804 b/changes/bug3804 index d498db8..7ad091c 100644 --- a/changes/bug3804 +++ b/changes/bug3804 @@ -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. diff --git a/src/common/tortls.c b/src/common/tortls.c index 2aaa2c4..1bb9c74 100644 --- a/src/common/tortls.c +++ b/src/common/tortls.c @@ -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);