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    SubjectRe: [PATCH 0/8] sdhci: Move real work out of an atomic context
    Hi Anton,

    On Thu, Sep 09, 2010 at 01:57:50AM +0400, Anton Vorontsov wrote:
    > Thanks!
    >
    > Would be also great if you could point out which patch causes
    > most of the performance drop (if any)?
    >
    > Albert, if you could find time, can you also "bisect" the
    > patchset? I wouldn't want to buy Nintendo WII just to debug the
    > perf regression. ;-) FWIW, I tried to disable multiblock
    > read/writes and test with SD cards, and still didn't notice
    > any performance drops.
    >
    > Maybe it's SDIO IRQs that cause the performance drop for the
    > WII case, as we delay them a little bit? Or it could be the
    > patch that introduces threaded IRQ handler in whole causes
    > it. If so, I guess we'd need to move some of the processing to
    > the real IRQ context, keeping the handler lockless (if
    > possible) or introducing a very fine grained locking.

    I didn't know anything about a reported performance drop, and I don't
    think Andrew did either -- Albert's test results don't seem to have
    made it to this list, or anywhere else that I can see. Could you
    link to/repost his comments?

    (I'll be testing with libertas, so that will stress-test SDIO IRQs.)

    Thanks,

    --
    Chris Ball <cjb@laptop.org> <http://printf.net/>
    One Laptop Per Child


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