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Message-Id: <200910051613.32631.elendil@planet.nl> Date: Mon, 5 Oct 2009 16:13:31 +0200 From: Frans Pop <elendil@...net.nl> To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Cc: Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>, linux-wireless@...r.kernel.org Subject: Re: [.32-rc3] scheduler: iwlagn consistently high in "waiting for CPU" On Monday 05 October 2009, Frans Pop wrote: > With .32-rc3 I'm getting occasional skips from amarok while playing > music from an NFS share (3 today so far), something I've not had in a > long time. > > The reason looks to be that latencytop consistently shows 'iwlagn' as > the top affected process with "Scheduler: waiting for CPU". > Values of 100-140 ms occur frequently, but I've also seen higher values > (180, 207). I don't remember seeing iwlagn high in the list before, but > I have not checked earlier kernels yet. > > Added to that 'phy0' also frequently shows high with values of 25-75 ms. > > The system is otherwise essentially idle. Other processes typically show > a latency < 5 ms. If I give the system some work to do (like compiling a kernel), the latencies on iwlagn and phy0 disappear (values < 5 ms). Is this related to ondemand frequency scaling? -- 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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