On Wed, 2007-10-31 at 22:53 +0100, Andi Kleen wrote: > Peter Zijlstra <[EMAIL PROTECTED]> writes: > > > Use HR-timers (when available) to deliver an accurate preemption tick. > > > > The regular scheduler tick that runs at 1/HZ can be too coarse when nice > > level are used. The fairness system will still keep the cpu utilisation > > 'fair' > > by then delaying the task that got an excessive amount of CPU time but try > > to > > minimize this by delivering preemption points spot-on. > > This might be costly when hrtimers happen to use an more expensive > to reprogram time source. Even an APIC timer access is fairly slow. > And you'll potentially add the to lots of context switces. > > Not sure that is a good idea for performance in general.
Well, me neither, it was just an idea, and a challenge to get working :-) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
