Date: Sat, 8 Mar 2008 22:00:07 GMT From: Anton Yuzhaninov <citrin@citrin.ru> To: net@FreeBSD.org Subject: Re: kern/93378: [tcp] Slow data transfer in Postfix and Cyrus IMAP (workaround known) Message-ID: <200803082200.m28M07bZ069830@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
The following reply was made to PR kern/93378; it has been noted by GNATS. From: Anton Yuzhaninov <citrin@citrin.ru> To: bug-followup@FreeBSD.org, jollyroger@one.lv Cc: Subject: Re: kern/93378: [tcp] Slow data transfer in Postfix and Cyrus IMAP (workaround known) Date: Sun, 09 Mar 2008 00:43:45 +0300 Probably it is interact between delayed ack and Nagle's algorithm. They shouldn't be used together: http://developers.slashdot.org/comments.pl?sid=174457&cid=14515105 So application which may be affected by this problem should disable Nagle's algorithm for via socket option TCP_NODELAY. As I can see current postfix uses setsockopt TCP_NODELAY so consider to upgrade postfix to 2.4.7 or 2.5.1 first. Postifx 2.2.8 is too old. -- WBR, Anton Yuzhaninov
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200803082200.m28M07bZ069830>