On 29 Sep 2002, Peter Osterlund wrote:
> Vladimir Dergachev <[EMAIL PROTECTED]> writes:
>
> > On 7 Jul 2002, Sean Walker wrote:
> >
> > > If I try and record with an alsa device selected, I get the following
> > > error:
> > >
> > > Audio reader: overrun occurred, resetting pcm device
> > >
> > > repeated multiple times until I stop recording. The sound system is
> > > working just fine except for this.
> >
> > Try reducing the sample rate, maybe your card cannot handle it.
>
> I have the same problem with a 2.2GHz P4 as soon as I use the computer
> for anything else during recording. It turns out to be caused by the
> ALSA stop_threshold defaulting to 768, which corresponds to 16ms at a
> 48kHz sampling rate. 16ms is much smaller than the linux scheduler can
> handle, unless you use realtime priority and low-latency patches.
> Increasing this threshold to something bigger fixed the problem for
> me. 8192 was enough on my system but I don't think a big value will
> cause any harm, so I suggest using 32768.
Interestingly enough I don't have any problems and my card's default is
16384. I would say this is probably a bug in the alsa driver - it should
set a reasonable default without requiring adjustments by a program that
simply reads data.
Or, maybe, I did not read some paragraph in ALSA docs.
Could ALSA folks comment ?
>
> Here is a patch I used while experimenting with this. (It obviously
> needs cleaning up before being applied.)
>
Thanks ! - merged.
best
Vladimir Dergachev
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