[PlanetCCRMA] jackd xruns problem: solved? (FC2 2.6.7rc4 O7 kernel)

Fernando Pablo Lopez-Lezcano nando@ccrma.Stanford.EDU
Sun Aug 15 16:56:01 2004

On Sun, 2004-08-15 at 15:26, Steve Harris wrote:
> On Sat, Aug 14, 2004 at 06:14:02 -0700, Fernando Pablo Lopez-Lezcano wrote:
> > Ok, Steve and other Fedora Core 2 bleeding edge users, I have the latest
> > and greatest (as of yesterday, 2.6.8 final was released in between :-)
> > over the fence. Has been tested to boot on all of two (2) machines, a P4
> > latop and an Athlon64 desktop...
> This kernel looks good.
> I had to run everything as root, as I couldn't build network drivers for
> this kernel and I couldn't remeber how to run the realtime lsm, but I got

/sbin/modprobe realcap allcaps=1
(to get the behavior that enables you to run jackstart)

> an AMS, jack-rack (with 6 or 7 plugins) and a JAMin running at 256
> samples, while doing some CPU and disk intensive non-realtime things and
> without a single xrun. It was running for about an hour with me changing
> things in the apps at random moments. I tested briefly at 128, but JAMin
> wasn't happy running at 128, so I couldn't test with much load, and I dont
> run that low for real anyway.

Good news! Very good news!

> I also wasn't using the LD_ASSUME_KERNEL trick (I forgot), I'l try with
> that tommorow.

I'm not using that myself in my tests. After all, we probably want to be
able to run the thing using nptl (long term). 

> I couple of times when I started up jackd I got the storm of "blah, blah
> exceeded, restarting" messages when I connected the first client, but
> oddly, quiting and restarting jackd git rid of them, so maybe theres a
> race condition on some priority setting stuff?

Strange. Anyway, it is encouraging that you are getting better results.
On to downloading and voluntary P0 (new series, Ox is already

-- Fernando