From owner-freebsd-performance@FreeBSD.ORG  Fri Mar 30 09:04:37 2007
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Date: Fri, 30 Mar 2007 04:25:06 -0400
To: Tek Bahadur Limbu <teklimbu@wlink.com.np>, freebsd-performance@freebsd.org
From: Gary Stanley <gary@velocity-servers.net>
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Subject: Re: FreeBSD-6.1 reboots due to high mbufs
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At 02:43 AM 3/30/2007, Tek Bahadur Limbu wrote:

>I have squid proxy server running on a FreeBSD-6.1 (amd) box. I have 
>been facing this problem for sometime now. It's related to mbufs. 
>For some reasons, my mbufs usage is extremely high. This high mbufs 
>usage causes slow responses from Squid and in rare occasions, it 
>even causes my server to reboot or locks out SSH sessions.
>
>This FreeBSD-6.1 squid box serves about 3000-4000 users.
>

Lower your net.inet.tcp.{recv,send}space to 32768, or 16384