Implement THREAD_PRIORITY_TIME_CRITICAL

[Willie Sippel]

Am Dienstag, 4. April 2006 16:46 schrieb Andreas Mohr:
> Hi,
>
> On Wed, Apr 05, 2006 at 12:36:06AM +1000, Con Kolivas wrote:
> > On Wednesday 05 April 2006 00:34, Andreas Mohr wrote:
> > > And this all should work perfectly well with NON-soft-realtime
> > > scheduling, as clearly said before.
> > > Well, in theory, at least...
> >
> > Andi just out of interest, how does normal scheduling on current ck
> > (2.6.16-ck3) perform with this?
>
> Hmm, difficult :-\
> I don't have any game candidate here, and frankly I don't even have a
> current Wine install...
>
No need for a full-blown game, I use this great free 5.9MB demo to test audio 
on Wine:
http://www.pouet.net/prod.php?which=18359

Unbearable with regular Wine (kernel 2.6.13/ amd64, gentoo r5 patchset - can't 
test with later kernels, as there's a problem with the SCSI-subsystem as of 
2.6.14), just dandy with Mikes patch and realtime-lsm...

> I'd think it's much easier for someone with such a Wine testcase to use a
> new kernel:
> - locate the .config file of the currently installed kernel package
> - get 2.6.16, patch to 2.6.16-ck3
> - run "make oldconfig" to answer all differences from current kernel
>   to 2.6.16-ck3 only
> - make bzImage modules modules_install
> - (update bootloader)
>
> About my sys call preemption latency rantings:
> It would be very useful to experiment with various CONFIG_PREEMPT settings
> here. And if some anomalies turn up, then it might be useful to add Ingo
> Molnar's latency tracing patch to a kernel and debug it further.
>
> Stuff like that really shouldn't happen given that many people (among
> those also Windows core developers) say that our scheduling and thread
> creation performance usually beats Windows XP hands down.
>
> Andreas

-- 
Willie Sippel

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