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    SubjectRe: [PATCH 5/5] ONLY-APPLY-IF-STILL-FAILING Revert 373c0a7e, 8aa7e847: Fix congestion_wait() sync/async vs read/write confusion
    Date
    On Tuesday 27 October 2009, KOSAKI Motohiro wrote:
    > Oops. no, please no.
    > 8aa7e847 is regression fixing commit. this revert indicate the
    > regression occur again.
    > if we really need to revert it, we need to revert 1faa16d2287 too.
    > however, I doubt this commit really cause regression to iwlan. IOW,
    > I agree Jens.

    This is not intended as a patch for mainline, but just as a test to see if
    it improves things. It may be a regression fix, but it also creates a
    significant change in behavior during swapping in my test case.
    If a fix is needed, it will probably by different from this revert.
    Please read: http://lkml.org/lkml/2009/10/26/510.

    This mail has some data: http://lkml.org/lkml/2009/10/26/455.

    > I hope to try reproduce this problem on my test environment. Can anyone
    > please explain reproduce way?

    Please see my mails in this thread for bug #14141:
    http://thread.gmane.org/gmane.linux.kernel/896714

    You will probably need to read some of them to understand the context of
    the two mails linked above.

    The most relevant ones are (all from the same thread; not sure why gmane
    gives such weird links):
    http://article.gmane.org/gmane.linux.kernel.mm/39909
    http://article.gmane.org/gmane.linux.kernel.kernel-testers/7228
    http://article.gmane.org/gmane.linux.kernel.kernel-testers/7165

    > Is special hardware necessary?

    Not special hardware, but you may need an encrypted partition and NFS; the
    test may need to be modified according to the amount of memory you have.
    I think it should be possible to reproduce the freezes I see while ignoring
    the SKB allocation errors as IMO those are just a symptom, not the cause.
    So you should not need wireless.

    The severity of the freezes during my test often increases if the test is
    repeated (without rebooting).

    Cheers,
    FJP


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