Re: sound problem

["Sepherosa Ziehau" <sepherosa@xxxxxxxxx>]

On 8/13/06, Thomas Nikolajsen <thomas.nikolajsen@xxxxxxx> wrote:
> Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > :Playing sound using pcm(4)/snd(4) gives bad quality: hiss
> > and hops, like sound isn't playing for very short time
> > periods.
> Problem is a scratz every 10 seconds;
> this was easier to hear with 440Hz sinus vs music.
> > :
> > :This is experienced:
> > : - not having SMP in kernel config (eg GENERIC)
> Ie. no problem when using SMP;
> but problem is still heard having SMP without APIC_IO.
> > : - from dfly-1.5 26th December '05 (24th is ok using
> > kernels from chlamydia);
> > :including HEAD.
> > :
> > :dfly-1.4 is ok, including 1.4.4.
> > :
> > :Using audio/mpg123 for MP3, 'cp test.raw /dev/dspW' or
> > pcmplay for decoded sound.
> > :Buffering audio data with mpg123 -b doesn't sound like
> > making any difference.
> > :
> > :CPU load doesn't sound like making any difference.
> > :Problem experienced on several systems, using snd_via8233
> > and snd_ich.
> I was wrong; only one pc experienced problem.
> (other systems has bad speakers)
> > :
> > :No X11 used.
> > :
> > : -thomas
> >
> >     Hmm.  That's quite odd.  There aren't any significant
> > source code changes
> >     bewteen the 24th and 26th of December (I diff'd the 23rd
> > and 27th to be
> >     conservative).
> >
> >                                       -Matt
> >                                       Matthew Dillon
> >                                       <dillon@xxxxxxxxxxxxx>
> It turns out problem is irq sharing: pcm0/re0 (too any NICs in test box).
>
> From 26th December '05: when ip-addr is configured on re0 problem is there;
> no problem without ip-addr configured.

Try:
sysctl kern.polling.enable=1
ifconfig re0 polling

See whether the problem still exists

Best Regards,
sephe

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