From owner-freebsd-amd64@FreeBSD.ORG  Fri Mar 23 18:41:56 2007
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Date: Fri, 23 Mar 2007 19:41:59 +0100
From: Julien Cassignol <freebsd-amd64@calaquendi.org>
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Subject: Re: Very slow performance while compiling/using X software
 on	AMD64/Nforce3 7.0-CURRENT
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Roland Smith wrote:

> Try enlarging the sound driver's DMA buffer, as documented on the
> following page: http://www.xs4all.nl/~rsmith/freebsd/#sound

# sysctl -a | grep pcm
[snip]
dev.pcm.0.buffersize: 16384
dev.pcm.0.vchans: 4
dev.pcm.0.vchanrate: 48000
dev.pcm.0.vchanformat: s16le

Still clicking, unfortunately. But it's a little better it seems. It's less sensitive, but when I launch firefox, for 
example, still hearable.

For example, I rebooted with your suggestion. Played some music, launched firefox (clic-clic), exited firefox : 2 
seconds of lag with no music.

-- 
Julien Cassignol