[linux-audio-user] Which kernel for low latency and kernel 2.6.1-mm# problems

Andrew Morton akpm at osdl.org
Wed Jan 21 05:20:04 EST 2004

Robert Jonsson <robert.jonsson at dataductus.se> wrote:
> Hi,
> It seems we have quite a few reports of 2.6 working badly with realtime 
> scheduling. 
> I haven't tried 2.6 myself yet, but, I would say there are problems that we 
> need to find and eliminate. (Still, it could be configuration issues, but we 
> need to find these too.) Last I heard Andrew (cc:ed) thought it worked as 
> good as 2.4, except for some rare corner cases.

Not as rare as one would like.  But not too bad unless you're doing heavy
filesytem work at the same time.

> On Wednesday 21 January 2004 03.38, Glenn McCord wrote:
> > James Stone wrote:
> > >>I run jack with:
> > >>jackstart -R -v -d alsa -d hw:0
> > >>
> > >>...and I get xruns whenever I open a program, move windows around. Hell
> > >>sometimes it does it when I'm just looking at it. More specifically, if
> > >>I want to record in ardour, jack chokes up an xrun after about 2 seconds.
> > >>

Is `jack' running with realtime priority, or is it merely SCHED_OTHER?

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