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    SubjectRe: 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
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