Sound (micro-)interrupts with 8.0 stable/snd_hda/mplayer/vlc

Thomas Hummel googhummel at
Sun Jan 17 14:07:40 UTC 2010

On Sun, Jan 17, 2010 at 1:03 AM, Pieter de Goeje <pieter at> wrote:

Thanks for your reply,

Try increasing the hw.snd.latency sysctl:

Going from 5 to 10 doesn't change anything (actually, it seems worse on the
file I tried). So the mystery still stands...

Note that the micro-interrupts don't occur always at the same timestamp in
the file which is playing.
If I play one, let's say 3 times in a row, sound may drop around the same
moment each time but not necessary...

Just thinking out loud here, but maybe you have some non-standard HZ
> configured or powerd configured to clock the CPU back by an extreme amount,
> both could theoretically cause buffer underruns.

I'm not quite sure I understand what you're thinking of. Anyway, I haven't
changed any defaults :

% cat /boot/loader.conf

# nividia

# sound

# k3b


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