From owner-freebsd-current@FreeBSD.ORG  Wed Mar  3 18:36:04 2004
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Date: Wed, 3 Mar 2004 18:36:04 -0800 (PST)
From: Doug White <dwhite@gumbysoft.com>
To: Nathan Seven <scosol@yahoo.com>
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cc: current@freebsd.org
Subject: Re: Strange sound issues with CURRENT
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On Mon, 1 Mar 2004, Nathan Seven wrote:

> I've synced to CURRENT to attempt to solve the other
> sound issues I was having with 5.2.1.RC2.
>
> Anyway- I can't yet tell if the stuttering and
> distortion  is fixed yet because, ~30 seconds after
> boot, a horrible cycling sample comes out of my
> speakers.
> It sounds to me like a looped chunk of something, like
> some buffer is filling without emptying and then its
> just freaking out.

You aren't running with WITNESS and INVARIANTS, are you? That tends to
cause lots of interrupt latency which freaks out sound.

Every 30s is the softupdates flush, which generates a fair amount of disk
I/O, and therefore interrupts.

-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite@gumbysoft.com          |  www.FreeBSD.org