Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

[Ingo Molnar]

* Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:

> > i'm pleased to announce the first release of the "Modular Scheduler 
> > Core and Completely Fair Scheduler [CFS]" patchset:
> > 
> >    http://redhat.com/~mingo/cfs-scheduler/sched-modular+cfs.patch
> 
> I would suggest to drop the tsc.c change. The "small errors" can be 
> really large on some systems and you can also see large backward 
> jumps.

actually, i designed the CFS code assuming a per-CPU TSC (with no global 
synchronization), not assuming any globally sync TSC. In fact i wrote it 
on such systems: a CoreDuo2 box that has stops the TSC in C3 and the 
different cores have wildly different TSC values and a dual-core 
Athlon64 that quickly drifts its TSC. So i'll keep the sched_clock() 
change for now.

> BTW with all this CPU time measurement it would be really nice to 
> report it to the user too. It seems a bit bizarre that the scheduler 
> keeps track of ns, but top only knows jiffies with large sampling 
> errors.

yeah - i'll fix that too if someone doesnt beat me at it.

	Ingo
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