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Date: Sat, 8 Mar 2008 22:00:07 GMT
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To: net@FreeBSD.org
From: Anton Yuzhaninov <citrin@citrin.ru>
Cc: 
Subject: Re: kern/93378: [tcp] Slow data transfer in Postfix and Cyrus IMAP
 (workaround known)
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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