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    SubjectRe: [Bug #32982] Kernel locks up a few minutes after boot
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    On Mon, 2011-04-18 at 20:21 +0200, Bart Van Assche wrote:
    > On Mon, Apr 18, 2011 at 1:44 PM, Jens Axboe <jaxboe@fusionio.com> wrote:
    > > Bart, can you try and pull:
    > >
    > > git://git.kernel.dk/linux-2.6-block.git for-linus
    > >
    > > into Linus' tree and see if that works? This has, among other things,
    > > Neils fixes for MD.
    >
    > md seems to work stable with the resulting tree, but it looks there is
    > a performance regression in the block layer not related to the md
    > issue. If I run a small block IOPS test on a block device created by
    > ib_srp (NOOP scheduler) I see about 11% less IOPS than with 2.6.38.3
    > (155.000 IOPS with 2.6.38.3 and 140.000 IOPS with 2.6.39-rc3+).

    The mapping code for ib_srp changed in 2.6.39-rc1, but it showed
    improved IOPS for a similar setup in my testing so I'd be surprised if
    it is the culprit. Still, it wouldn't hurt to check. Do you have time to
    try the new ib_srp code with 2.6.38.3 to eliminate it from the equation?

    Thanks,
    Dave



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