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    SubjectRe: 2.4.20: Proccess stuck in __lock_page ...
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    On Wed, 2003-05-28 at 09:08, Jens Axboe wrote:
    >
    > > > May I ask how you are reproducing the bad results? I'm trying in vain
    > > > here...
    > >
    > > Quoting Con Kolivas:
    > >
    > > dd if=/dev/zero of=dump bs=4096 count=512000
    >
    > already tried that, no go. on ide/scsi? what filesystem? how much ram?
    > anything else running? smp/up?

    I think we've got a few different problems. On SMP boxes, you need to
    have the fix-pausing patch from andrea applied to catch all the corner
    cases.

    On UP boxes it's possible the requests are starving in the drive, SCSI
    users should try with the max tags set down to something sensible,
    between 8 and 32.

    IDE people can try lowering the max_kb_per_request paramater in
    /proc/ide/<drive>/settings, but this should only affect starvation with
    the writeback cache on.

    I made a patch a while ago that timed how long people spent waiting in
    __get_request_wait, it might help us figure out where the starvation is
    really happening.

    -chris


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