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Date: Tue, 7 Nov 2006 12:59:05 -0800 (PST) From: Christoph Lameter <clameter@....com> To: Ingo Molnar <mingo@...e.hu> cc: "Siddha, Suresh B" <suresh.b.siddha@...el.com>, akpm@...l.org, mm-commits@...r.kernel.org, nickpiggin@...oo.com.au, linux-kernel@...r.kernel.org Subject: Re: + sched-use-tasklet-to-call-balancing.patch added to -mm tree On Tue, 7 Nov 2006, Ingo Molnar wrote: > Per-CPU tasklets are equivalent to softirqs, with extra complexity and > overhead ontop of it :-) > > so please just introduce a rebalance softirq and attach the scheduling > rebalance tick to it. But i'd suggest to re-test on the 4096-CPU box, > maybe what 'fixed' your workload was the global serialization of the > tasklet. With a per-CPU softirq approach we are i think back to the same > situation that broke your system before. What broke the system was the disabling of interrupts over long time periods during load balancing. - 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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