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Date: Wed, 26 Jan 2005 02:15:56 -0600
From: Nikolas Britton <freebsd@nbritton.org>
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To: Derek <derekm@rogers.com>
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cc: collin.mcclendon@hotmail.com
Subject: Re: Xmms FreeBSD and buzzing or skipping sound
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Derek wrote:

> Collin McClendon wrote:
>
>> I've noticed for quite some time (at least on 5.x even before 
>> -CURRENT) that if I'm unzipping or tarring a file that it is enough 
>> to make xmms play mp3s with intermittent buzzing. I have a fairly 
>> fast machine, dual athlon 1.53 Ghz with 1 GB of ram and a fully scsi 
>> setup, 4 10K maxtors in a Raid 0 stripe set.
>
>
> Did you ever find a solution to this Collin?
>
> I've got a 5.3-STABLE SMP machine, with a promise RAID controller,
> RAID1, with snd_emu10k1.ko, and I get the same results...  Re-nicing
> xmms doesn't help either...
>
> Cheers,
> Derek
>
I noticed that no one has suggested this thus far so...

#sysctl hw.snd

#man sound
Runtime Configuration
     The following sysctl(8) variables are available:

           hw.snd.pcm%d.buffersize     Configure the amount of DMA 
bufferspace
                                       available for a device.

           hw.snd.targetirqrate        Set the default block size such that
                                       continuous playback will achieve this
                                       IRQ rate.  This value can be tuned to
                                       improve application performance.
                                       Increase this value when the 
sound lags
                                       and decrease it if sound stutters or
                                       breaks up.


My /boot/loader.conf:
hw.snd.targetirqrate=48
hint.pcm.0.buffersize="8192"