[linux-audio-user] MOre realtime!
J M Needham
J.M.Needham at bath.ac.uk
Wed Dec 20 09:27:55 EST 2006
Ok, thanks Lars. I guess I'll be treating myself to an audiophile for
Christmas unless anyone's got a better idea.
On Wed, 20 Dec 2006, Lars Luthman wrote:
> On Wed, 2006-12-20 at 10:34 +0000, J M Needham wrote:
> > So I've just installed Ubuntu 6.09, and followed the instructions on
> > http://fort2.xdas.com/~kor/oss2jack/install.html to install the
> > realtime-lsm module and I've added
> > @audio - rtprio 80
> > @audio - memlock 500000
> > to /etc/security/limits.conf and set the realtime mode on Jack. Seems ok,
> > the only thing is that I can't get below 5.8 ms latency. Jack's behaving
> > nicely with very few xruns, but won't do any better. The output of the
> > messages with 32 frames for capture, for example, is:
> > 10:41:35.039 Startup script...
> > ...
> > configuring for 44100Hz, period = 32 frames, buffer = 2 periods
> > ALSA: cannot set period size to 32 frames for capture
> > ALSA: cannot configure capture channel
> > cannot load driver module alsa
> It looks like your hardware simply can't handle buffer sizes that small.
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