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Date:      Tue, 01 Apr 1997 15:48:34 -0800
From:      David Greenman <dg@root.com>
To:        Robert Withrow <witr@rwwa.com>
Cc:        hackers@freebsd.org
Subject:   Re: Can anyone here help these people? 
Message-ID:  <199704012348.PAA20241@root.com>
In-Reply-To: Your message of "Tue, 01 Apr 1997 17:16:05 EST." <199704012216.RAA04747@spooky.rwwa.com> 

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>There is an order of magnitude difference in the performance of
>postgress between FreeBSD and Linux, with FreeBSD loosing.  Here
>is a ktrace that shows the problem...
...
>Here it's almost 1/5 of a second between getting the "Pblank" (I don't
>know what that signifies, maybe it's a clue to something.) after the

   The problem is caused by the Nagle Congestion Avoidence algorithm. See
pages 269-270 of TCP/IP Illustrated, Volume 1. The problem can be eliminated
by setting the TCP_NODELAY socket option.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project



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