Sound performance problems in FreeBSD

Markus Hästbacka midian at
Thu Sep 9 03:15:43 PDT 2004

On Thu, 9 Sep 2004, Ulrich Spoerlein wrote:
> Not repdrocueable here on 5.3-BETA3. Even extracting the Mozilla sources
> no longer produces skips ind mp3 playback.
> pcm0: <Intel ICH4 (82801DB)> port 0xbc40-0xbc7f,0xb800-0xb8ff mem 0xf4fff400-0xf4fff4ff,0xf4fff800-0xf4fff9ff irq 5 at device 31.5 on pci0
> pcm0: [GIANT-LOCKED]
> pcm0: <SigmaTel STAC9750/51 AC97 Codec>
> % cat /dev/sndstat
> FreeBSD Audio Driver (newpcm)
> Installed devices:
> pcm0: <Intel ICH4 (82801DB)> at io 0xb800, 0xbc40 irq 5 bufsz 16384 kld snd_ich (1p/1r/4v channels duplex default)
is your buffersize higher than 4k? The MP3 playing worked well when I had 
16k buffer, but that meant high sound latency for games, and it wouldn't 
be a solution to fix it by highing the sound buffersize. So the only thing 
I can live with is 4k at the moment.


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