Subject: Re: [linux-audio-user] Which kernel for low latency and kernel 2.6.1-mm# problems
From: Robert Jonsson (robert.jonsson_AT_dataductus.se)
Date: Wed Jan 21 2004 - 12:07:45 EET
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.
Now, how do we proceed, are there any evidence that we can forward to the
kernel folks?
Regards,
Robert
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.
> >>
> >>Now, if I whip up my 2.4.2 with Andrew Morton's Low latency patch,
> >>install alsa-lib, alsa-driver and alsa-utils version 1.0.1with the
> >>gentoo ebuilds, then compile jack like above... presto, no problems.
> >>So I'm thinking somethings missing in the kernel somewhere. Or perhaps
> >>the system settings are disagreeing with the way the kernel is setup.
> >
> >Ah.. I have just tried 2.4.23 with the low latency patch again.. and I
> >agree.. Jack is much more stable. I am not sure I was getting as many
> >xruns as you, but in 2.4.23 I am getting absolutely none, even being
> >quite rough with opening and closing things.. Even running kernel
> >compile in the background!
>
> phew, it's good to see I'm not the only one.
>
> >This paired with the kernel panics I was getting on shutdown makes me
> >think that 2.6.x is not quite ready for audio yet.
> >
> >James
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