[linux-audio-user] dipping toes in 2.6 waters

[Fernando Pablo Lopez-Lezcano]

On Fri, 2004-08-06 at 22:24, Lee Revell wrote:
> On Mon, 2004-08-02 at 19:57, Florian Schmidt wrote:
> 
> > I think that this is the right mooment to grab a vanilla 2.6.8-rc2 and
> > just try one of Ingos new volountary preemption patches. You might be
> > positively surprised.. If not, send a report to Ingo. Lee Revel is also
> > busy testing Ingos patches and reporting all latencies he found. But
> > more testers are needed.
> 
> Hey,
> 
> I would have commented earlier but was out of town all week.
> 
> As Ingo's patches stabilize, it is very important for more people to
> test them.  With 2.6.8+voluntary-preempt-O3, using voluntary_preempt=3,
> kernel_preemption=1, and the soundcard and RTC irqs non-threaded, it
> works for me (tm) - I have been unable to produce a latency over 50
> usecs, even while punishing the machine with parallel builds and iozone
> -a.
> 
> We need people to test with different hardware configurations and
> workloads.  Especially needed are testers with ACPI,

That would be my laptop, probably :-)

> APIC, SMP, HT
> machines.  There are still some ACPI related bugs, more testers are
> needed to nail these down.  There are some reports of lockups which I
> cannot reproduce. 

I'm starting to test 2.6.7 rc2-mm2 + voluntary preempt O3 (at Planet
CCRMA). So far my limited tests have been very promising. I still have
to build a debugging version of alsa (and probably add your patches to
jack - very nice histograms!). 

Hopefully I'll be able to contribute some data...

While I see a much decreased latency I still have weird problems with
jack and the combinartion of qjackctl, jack, several jack clients
loading the system, 2.6.x and nptl. 

Many thanks for the work you have been doing! (I've been in a trip and
then too busy but was trying to monitor email and was looking at all
those posts without having time to test anything :-)

-- Fernando