[linux-audio-dev] ALSA performance issues?

Clemens Ladisch cladisch at fastmail.net
Thu Dec 21 15:07:27 UTC 2006

Mario Lang wrote:
> I just tried to get sound working on a LinkSys NSLU2 (ARM) running
> Debian Etch using a USB sound card.
> What I discovered I find pretty strange, and would like to know some
> more details.  Apparently, all ALSA native clients don't
> manage to play sound click-free, they actually have underruns all the
> time.  However, if I use OSS (via the snd-pcm-oss module) and set
> libao to use the oss driver, I get perfect playback with about
> 20% CPU use at maxiumum by the user-space app playing/decoding files.

Does the same happen when ALSA clients play to device "hw:0" as
opposed to the default dmix device?


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