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Date: Mon, 16 Apr 2007 23:05:56 +0200 From: Ingo Molnar <mingo@...e.hu> To: Andi Kleen <andi@...stfloor.org> Cc: linux-kernel@...r.kernel.org Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS] * Andi Kleen <andi@...stfloor.org> 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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