Messages in this thread | | | Date | Thu, 7 May 2009 10:54:41 -0700 | From | "Paul E. McKenney" <> | Subject | Re: [PATCH] x86: Reduce the default HZ value |
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On Thu, May 07, 2009 at 01:20:29PM -0400, Christoph Lameter wrote: > On Thu, 7 May 2009, Peter Zijlstra wrote: > > > Another user is RCU, the grace period is tick driven, growing these > > ticks by a factor 50 or so might require some tinkering with forced > > grace periods when we notice our batch queues getting too long. > > One could also schedule RCU via hrtimers with a large fuzz period?
You could, but then you would still have a periodic interrupt introducing jitter into your HPC workload. The approach I suggested allows RCU to be happy with no periodic interrupts on any CPU that has only one runnable task that is a CPU-bound user-level task (in addition to the idle task, of course).
Thanx, Paul
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