linuxaudio.org

On Sunday 09 March 2008 12:12:24 Hartmut Noack wrote:

quoted text
> > James Stone hat gesagt: // James Stone wrote:

> >> Do you have any idea what kind of latency under jack I would

> >> expect from a CM-106 based card vs. a "Burr-Brown from TI"

> >> chipset (Behringer UCA 202).

> >

> > All USB cards (in ALSA) have the same latency.

>

> Is that a fact? [SHOCK] So, if I use a Edirol UA-101 for appr. 550 Eur

> it would force me to use the same settings for jack (for 17ms that is)

> as my crude Behringer U-Control??

You should be able to achieve much better latencies than that, even with the

U-Control.

I can run all my USB devices, including the crappy UCA 202, at 4ms latency

(48000/64/3). I don't get any xruns, except when starting some JACK clients

(but there a higher latency doesn't help much either).

This is with a -rt kernel, of course, and tuning the IRQ priorities with chrt

made a huge difference. I got the best results when I increased the

priorities for rtc and usb, but not for the machine's built-in soundcard

(which I don't use at the same time).
Dominic

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