[linux-audio-dev] Re: [Jackit-devel] =?ISO-8859-1?Q?2=2E4=2E20-rc1=C2?= + lowlat +preempt + alsa + jack = dead computer

Fernando Pablo Lopez-Lezcano nando at ccrma.Stanford.EDU
Fri Dec 6 22:05:01 UTC 2002


> > > > Have you tried anything in between pre10-ac3 and pre4? I know pre4 works
> > > > fine. I probably should post to the lkml with as much detail as we can
> > > > get (unless some kernel hacker is actually reading these messages).
> > >
> > > I've tried every kernel from 2.4.20-pre5 up to 2.4.20-pre10, and again
> > > 2.4.20-pre10-ac3, which caused a lockup on my system in the past, this
> > > afternoon. And I couldn't reproduce even _one_ lockup. I use another IDE
> > > interface though: a cmd649 add-on controller. The lockups happened with
> > > the onboard IDE interface (VIA KT333 chipset, vt8235 southbridge).
> > 
> > To add one more datapoint to the thread and (apparently good news): I'm
> > testing 2.4.20 (final) + lowlat + preempt + acpi + alsa + jack and the
> > computer seems to be chugging along nicely. This is with today's alsa. A
> > slighly older alsa did lock the computer after 5 or so minutes of jack
> > activity but I managed to reboot it with the sysrq magic key. With the
> > newest alsa I got jack + freqtweak + ams (with the demo patch) running
> > for 50 minutes until for some reason jack died due to a watchdog
> > interrupt. Not bad.
> 
> Where are the lowlat and preempt patches for 2.4.20? 

Not on the net at this point. I have been hand tweaking the originals to
patch cleanly (trying to fix the failing chunks). I can email them to
you, use at your own risk :-)

BTW, results in my current tests are inconclusive, a couple of times I
managed to freeze the machine soon after I started just jackd and
qjackconnect. I'm currently trying to see if I can stat the stuff from
the text console so that I can try to catch some register dumps through
the sysrq magic key...

-- Fernando





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