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Date: Wed, 03 Aug 2005 10:38:58 +0200
From: Pieter de Boer <pieter@thedarkside.nl>
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Cc: Dave+Seddon <dave-sender-1932b5@seddon.ca>, freebsd-net@freebsd.org
Subject: Re: running out of mbufs?
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Mike Silbersack wrote:

>> net.inet.tcp.sendspace=1024000
>> net.inet.tcp.recvspace=1024000
>> kern.ipc.maxsockbuf=20480000
> I don't think large socket buffers have been tested well, it's possible 
> that you're exhausting almost all of your mbufs with just a few 
> connections - if you're really stuffing that much data in.  I'd go back 
> to the default settings for the above and try again.

With the added note that the send/recv spaces should be 65535 * 2^x 
(which 1024000 isn't). I might add that there's still a bug in the 
calculation of the TCP window scale option with regards to the set 
window size, leading to a FreeBSD system advertising a too large 
recvspace, which makes setting this option right even more necessary. 
(http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/82470)

-- 
Pieter