Sound performance problems in FreeBSD

Ulrich Spoerlein q at uni.de
Thu Sep 9 01:25:30 PDT 2004


On Thu, 09.09.2004 at 02:47:40 -0400, Suleiman Souhlal wrote:
>   FYI, after a few IRC discussions with Markus, we've discovered that 
> turning off the memory part of Gnome's System Monitor applet, would get 
> rid of the skips. I believe the problem is that both sysctl and the 
> sound drivers are Giant-locked, and so there is some contention. An 
> easy way to reproduce these skips is to run `while true; do sysctl 
> vm.vmtotal; done`, while playing an mp3.

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)


Ulrich Spoerlein
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