DAC1 / DAC2 for ex137x - ES1370/1/2/3 , CT5880/CT4730(EV1938)

Alexander Leidinger Alexander at Leidinger.net
Fri Oct 7 00:43:46 PDT 2005

Ariff Abdullah <skywizard at MyBSD.org.my> wrote:

> 'Buzz'ing or continuous stuttering/crackling is another issue, mostly
> related to non-PREEMPTION kernel or PCI latency timing issue (which is
> why you get hw.snd.pcm0.latency_timer on es137x).

A thought comes into my mind...

Stupid as I am sometimes, I thought so far the bad sound quality of my
SoundBlaster PCI (128 or 512 ... damn, I have to look it up at home) is some
kind of hardware problem in my PC... I thought this, because in Windows it
sounds as bad as with FreeBSD. Ok, Windows is bad, but regarding the
multimedia topic I've never seen such bad behavior from Windows XP. That's
the reason for thinking it's a hardware problem.

But now I'm not sure anymore. I have PREEMPTION in my kernel. And it doesn't
sound like stuttering. It sounds like distortion. I don't know how to
describe this further. It seems it is related to activity on the PCI bus.

Does this sound like a problem which can be solved with latency_timer/slave

I think I have to get some time at Sunday to give it a try...


http://www.Leidinger.net  Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org     netchild @ FreeBSD.org  : PGP ID = 72077137
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