Re: 2.6.19-rc6-rt8: alsa xruns

Daniel Walker
2006-11-28T22:01:49Z

On Tue, 2006-11-28 at 21:14 +0100, Ingo Molnar wrote:
> * Lee Revell <rlrevell@joe-job.com> wrote:
>
> > On Tue, 2006-11-28 at 11:58 -0800, Fernando Lopez-Lezcano wrote:
> > > Hi, I'm trying out the latest -rt patch and getting alsa xruns when
> > > using jackd and jack clients. This is a sample from the output of
> > > qjackctl / jackd (jack 0.102.25, qjackctl 0.2.21):
> >
> > Any improvement if you disable high res timers?
> >
> > Also, the latency tracer does not work on dual core AMD machines due
> > to the TSC drift. Might as well disable it.
>
> i fixed this in -rt8: the latency tracer now uses the time of day
> clocksource - pmtimer in this case. (that means function tracing is
> slower than with the TSC, but latency figures are more reliable.)

I have a patch set to make the using the clocksources a little nicer..
Is there anything I should add to that interface to help enable latency
tracing, or are you satisfied with using the timekeeping clocksource?
It might get constrictive after a while.

Daniel