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Message-ID: <20110908132756.GT31717@ics.muni.cz> Date: Thu, 8 Sep 2011 15:27:56 +0200 From: Lukas Hejtmanek <xhejtman@....muni.cz> To: Kiyoshi Ueda <k-ueda@...jp.nec.com> Cc: "Jun'ichi Nomura" <j-nomura@...jp.nec.com>, agk@...hat.com, linux-kernel@...r.kernel.org Subject: Re: request baset device mapper in Linux On Mon, Aug 01, 2011 at 06:31:02PM +0900, Kiyoshi Ueda wrote: > Hi Lukas, > > Lukas Hejtmanek wrote: > > On Sat, Jul 23, 2011 at 04:28:06PM +0900, Jun'ichi Nomura wrote: > >> As Kiyoshi suggested, it is important to know whether this > >> problem occurs with the latest kernel. > >> So if you could try 3.0, it would be very helpful. > > > > so, do I need to check recent kernel as the patch works for me? > > Yes, please. > (Unfortunately my storage has been broken today :-<) > > CPU usage seems to be one of the reasons for your case, but I > still cannot understand why memory pressure is needed. > I want to know your problem also occurs on 3.0 without the patch. Well, I tried 3.0.3 kernel. It is not so bad as 2.6.32.36, but it is not as good as the same kernel with your patch. CPU load is caused by ksoftirqd (30-40%) and kworker (30%). Overal speed is about 2.5GB/s. With your patch I can reach 2.8-2.9GB/s. -- Lukáš Hejtmánek -- 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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