Re: [patch] voluntary-preempt-2.6.8-rc3-O5

Ingo Molnar
2004-08-11T12:44:29Z

* Florian Schmidt <mista.tapas@gmx.net> wrote:

> > i'm currently running a loop of mlockall-test 100MB on a 466 MHz
> > Celeron, and not a single blip on the radar with a 1000 usecs
> > threshold, after 1 hour of runtime ...
>
> I suppose you're not using jackd. As i have noticed that these
> critical sections only get reported when jackd is running. It seems
> jackd is producing a certain kind of load which exposes them..

so you can only trigger the latencies via mlockall-test if jackd is also
running? Or do the latencies only trigger in jackd (and related
programs)?

if the later, then i'm wondering whether any of the audio code turns off
caching for specific pages or does DMA to user pages, or mmap()s device
(PCI) memory?

Ingo