Subject: Re: Overruns are killing my recordings.
From: Lee Revell <rlrevell@joe-job.com>
To: Mark Knecht <markknecht@gmail.com>
Cc: lkml <linux-kernel@vger.kernel.org>
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Date: Fri, 28 Oct 2005 14:43:25 -0400
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On Fri, 2005-10-28 at 07:52 -0700, Mark Knecht wrote:
> On 10/27/05, Lee Revell <rlrevell@joe-job.com> wrote:
> > On Thu, 2005-10-27 at 17:00 -0700, Avuton Olrich wrote:
> > > aggh. Sorry for all the noise,
> > >
> > > I have all my drives on a linear raid and I had hdparm set to put my
> > > IDE drives to sleep after a while, I didn't put it together because it
> > > was happening in the middle of recording.
> >
> > Hey, I think it's a testament to the progress that has been made in the
> > past year and a half that people now consider audio dropouts in a "known
> > good" app like ecasound to be a kernel bug.  For the longest time the
> > answer was "linux isn't an RTOS, deal with it".
> >
> > Lee
> 
> Lee, et. all,
>    Could this possibly be part of what is causing my xrun problems? I
> had a huge rash of xruns yesterday. I seem to run into issues after
> longer times of inactivity. I hadn't considered this possibility
> before.

I really doubt it.  It's more likely that the xruns are caused by a bug
in the new ktimers system.  I am seeing "xruns" here too with -rt1, but
the latency tracer does not report anything over ~120 usecs.  Previous
to all the ktimers/HRT stuff going in, I was xrun free for months.

The reason I think it's a ktimers bug is because sometimes JACK reports
an xrun of negative length which I'd NEVER seen before.

I suspect this might all be fixed in the latest -rt patch but I have not
had time to build it.

Lee

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