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Message-ID: <20070207141919.C19581@unix-os.sc.intel.com> Date: Wed, 7 Feb 2007 14:19:19 -0800 From: "Siddha, Suresh B" <suresh.b.siddha@...el.com> To: mingo@...e.hu Cc: Ingo Molnar <mingo@...e.hu>, vatsa@...ibm.com, clameter@....com, tglx@...utronix.de, arjan@...ux.intel.com, linux-kernel@...r.kernel.org Subject: Re: [RFC] Patch: dynticks: idle load balancing On Tue, Jan 30, 2007 at 01:57:09PM -0800, Siddha, Suresh B wrote: > Please let me know if you still see this issue with the latest -rt kernel. > > On Tue, Jan 16, 2007 at 12:35:05PM +0100, Ingo Molnar wrote: > > on the latest -rt kernel, when the dynticks load-balancer is enabled, > > then a dual-core Core2 Duo test-system increases its irq rate from the > > normal 15/17 per second to 300-400/sec - on a completely idle system(!). > > Any idea what's going on? I'll disable the load balancer for now. Ok. got time to look into this. The answer is simple. load_balancing in the recent kernels is happening using SCHED_SOFTIRQ and in -rt tree that happens not in the idle process context but in the context of softirqd for SCHED_SOFTIRQ. This breaks the dynticks load balancer and also the regular idle load balancing too :( Am on to fixing the problem now :) thanks, suresh - 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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