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Message-ID: <20080229155741.GF27248@elte.hu> Date: Fri, 29 Feb 2008 16:57:41 +0100 From: Ingo Molnar <mingo@...e.hu> To: Ray Lee <ray-lk@...rabbit.org> Cc: "Carlos R. Mafra" <crmafra2@...il.com>, kernel list <linux-kernel@...r.kernel.org>, Arjan van de Ven <arjan@...radead.org> Subject: Re: Interactivity issue in 2.6.25-rc3 * Ray Lee <ray-lk@...rabbit.org> wrote: > But it's good to keep in mind that the scheduler can't do anything > about slowdowns due to tasks being swapped out or waiting on reads > from the disk. I mention this as shortly after CFS got into mainline, > something changed in the VM that seems to make my system spend a lot > more time in IO wait, causing the system to be much less responsive > than it used to be. > > Unfortunately it seems to be dependent upon the history of what tasks > I've run and their memory usage, so it's been hard to come up with a > reproducible test case (well that and a complete lack of time). All I > can say is that I've seen what you've reported as well, though it had > nothing to do with using any 3d applications, just a browser, editor, > gcc, etc. what does latencytop say about those delays, what causes them? It should be able to capture all sorts of latency sources in the system. Ingo -- 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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