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Date: Sun, 20 Jan 2008 17:52:50 -0600 (CST)
From: Mike Silbersack <silby@silby.com>
To: s3raphi <seraphi.lord@gmail.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: FreeBSD 7 TCP syncache fix: request for testers
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On Sun, 20 Jan 2008, s3raphi wrote:

> I am running web polygraph against a FreeBSD7.0-RC1 squid server and
> experiencing problems. I have run the same test against the same hardware on
> FreeBSD 6.1 without issue. This seems to be specific to FreeBSD 7.
> The problem is related to the number of client connections:
> 250 Clients - runs great.
> 500 Clients- scores well in polygraph, but does have a few errored requests
> 750-2000 Clients - Error rate spikes way up and performance takes a
> nosedive.
>
> This looks similar to what is described in  this thread. Has your fix been
> rolled in to RC1?

The syncache in 7.0-RC1 has all known bugs fixed, so either you are 
encountering a new bug or simply having a lot of packet loss.  Please try 
to use tcpdump to capture traffic while these errors are occuring, and 
include info as to whether you are using any firewalls of any sort 
anywhere in the connection.

Then send that to me and I'll get to it as soon as I can, which may be a 
week from now.

-Mike