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    SubjectRe: [Bug #13319] Page allocation failures with b43 and p54usb
    Date
    On Monday 29 June 2009, Larry Finger wrote:
    > Rafael J. Wysocki wrote:
    > > This message has been generated automatically as a part of a report
    > > of regressions introduced between 2.6.29 and 2.6.30.
    > >
    > > The following bug entry is on the current list of known regressions
    > > introduced between 2.6.29 and 2.6.30. Please verify if it still should
    > > be listed and let me know (either way).
    > >
    > >
    > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13319
    > > Subject : Page allocation failures with b43 and p54usb
    > > Submitter : Larry Finger <Larry.Finger@lwfinger.net>
    > > Date : 2009-04-29 21:01 (61 days old)
    > > References : http://marc.info/?l=linux-kernel&m=124103897101088&w=4
    > > http://lkml.org/lkml/2009/6/7/136
    > > Handled-By : Johannes Berg <johannes@sipsolutions.net>
    >
    > The cause of these failures has been determined. The wireless
    > subsystem frequently requests buffers of size 4096, but when SLUB
    > debugging is enabled and the debug info is added, the request becomes
    > of order 1 and memory becomes fragmented.
    >
    > A controversial "fix" in which SLUB debugging was disabled for
    > allocations where adding such debugging info would increase the order
    > was discussed and tried. With a quick look at the commit list for
    > Linus's tree, I don't see that such a patch is available, but I will
    > be corrected if I missed it.

    Thanks for the update.

    Hmm, isn't it suboptimal to use a slab allocator for allocations taking up an
    entire page? That's the case on some architectures and seems to be the root
    cause of the issue at hand.

    Best,
    Rafael


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