Date: Sat, 18 Mar 2006 06:03:31 +0800 From: Ariff Abdullah <ariff@FreeBSD.org> To: dick hoogendijk <dick@nagual.st> Cc: freebsd-questions@FreeBSD.org Subject: Re: soundcard optimize Message-ID: <20060318060331.6c7292ae.ariff@FreeBSD.org> In-Reply-To: <20060317222148.f387e46a.dick@nagual.st> References: <20060317222148.f387e46a.dick@nagual.st>
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On Fri, 17 Mar 2006 22:21:48 +0100
dick hoogendijk <dick@nagual.st> wrote:
> Running FreeBSD-6.0 on an older AMD duron800 (512Mb). Sometimes the
> sound stutters. It's an older soundcard (es137x / SB PCI 128)
>=20
> I *know* the sound support is much better in FreeBSD-6.1 but I can't
> update yet (production server).
The idea of having sound and multimedia facilities on production
server is quite disturbing :)
>=20
> So I wonder, are there sysctl setttings that will improve the sound
> support in fbsd-6.0 that I can set?
>
1) Enable virtual channels
# sysctl hw.snd.maxautovchans=3D10
# sysctl hw.snd.pcm0.vchans=3D1
2) Increase PCI Latency Timer, either through BIOS, or using
pciconf(8). You can use this:
http://people.freebsd.org/~ariff/utils/pcilattimer
.. to avoid cryptic nature of pciconf(8) (it is just a wrapper to
pciconf, by the way).
3) Use SCHED_ULE .. wait, that is production server ;)
--
Ariff Abdullah
FreeBSD
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