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BUG: compression: disable auto-close and enable MSG_MORE during transfer

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We don't want the lower layer to forward a close while we're compressing,
and we want the system to fuse outgoing TCP segments using MSG_MORE as
much as possible to save round trips that can emerge from sending short
packets with a PUSH flag.

A test on a remote busy DSL line consisting in compressing a 100MB file
on the fly full of zeroes only showed a transfer rate of a few kB/s due
to these round trips.
This commit is contained in:
Willy Tarreau 2012-10-27 01:36:34 +02:00
parent 70737d142f
commit 08b4d79d31
1 changed files with 2 additions and 2 deletions
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4
src/proto_http.c
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@ -5729,7 +5729,7 @@ int http_response_forward_body(struct session *s, struct channel *res, int an_bi
* Similarly, with keep-alive on the client side, we don't want to forward a
* close.
*/
if ((msg->flags & HTTP_MSGF_TE_CHNK) ||
if ((msg->flags & HTTP_MSGF_TE_CHNK) || s->comp_algo ||
(txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_KAL ||
(txn->flags & TX_CON_WANT_MSK) == TX_CON_WANT_SCL)
channel_dont_close(res);
@ -5742,7 +5742,7 @@ int http_response_forward_body(struct session *s, struct channel *res, int an_bi
* flag with the last block of forwarded data, which would cause an
* additional delay to be observed by the receiver.
*/
if (msg->flags & HTTP_MSGF_TE_CHNK)
if ((msg->flags & HTTP_MSGF_TE_CHNK) || s->comp_algo)
res->flags |= CF_EXPECT_MORE;
/* the session handler will take care of timeouts and errors */