[LAU] UA25 and xruns

[hollunder at gmx.at]

On Wed, 26 Nov 2008 06:45:46 -0500
Dave Phillips <dlphillips at woh.rr.com> wrote:

> Greetings,
> 
> I received my UA25 yesterday. The system recognizes it immediately,
> and audio I/O appears to be working fine. The MIDI ports show up in 
> QJackCtl's ALSA connections panel, but I haven't tested them.
> 
> Nice unit, but there's one big trouble with it: I get a lot of xruns 
> from JACK. I've Googled for solutions, tried every suggested setting, 
> got no joy. The only setting that works without xruns at all yields a 
> latency of more than 30 ms (-p 512 -n 4 -r 44100). If I lower the
> period size to 256 I can get the latency down to 23.2 ms and suffer
> only an occasional xrun. Btw, the rtirq script doesn't seem to help
> this unit.
> 
> I thought this device would get lower latency than the on-board 
> soundchip, but the HDA chipset runs at ~17 ms latency with no xruns
> at all. Am I missing something ? The UA25's Advanced switch is on,
> the sample rate is set correctly. Any further suggestions ?
> 
> Best,
> 
> dp

At least -p 128 -n 3 -r 44100 should work fine, at least it does so on
my ubuntu system.
I wouldn't try to get much lower.
Haven't configured arch for audio yet, will do so soon and see what the
stock kernel can do.

Philipp