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    SubjectRe: Processes stuck on D state on Dual Opteron
    Claudio Martins wrote:

    > Right. I'm using two Seagate ATA133 disks (ide controler is AMD-8111) each
    > with 4 partitions, so I get 4 md Raid1 devices. The first one, md0, is for
    > swap. The rest are
    >
    > ~$ df -h
    > Filesystem Size Used Avail Use% Mounted on
    > /dev/md1 4.6G 1.9G 2.6G 42% /
    > tmpfs 1005M 0 1005M 0% /dev/shm
    > /dev/md3 32G 107M 30G 1% /home
    > /dev/md2 31G 149M 29G 1% /var
    >
    > In these tests, /home on md3 is the working area for stress.
    >
    > The io scheduler used is the anticipatory.
    >

    OK.

    >
    > OK, I'll try them in a few minutes and report back.
    >

    I'm not overly hopeful. If they fix the problem, then it's likely
    that the real bug is hidden.

    > I'm curious as whether increasing the vm.min_free_kbytes sysctl value would
    > help or not in this case. But I guess it wouldn't since there is already some
    > free memory and also the alloc failures are order 0, right?
    >

    Yes. And the failures you were seeing with my first patch were coming
    from the mempool code anyway. We want those to fail early so they don't
    eat into the min_free_kbytes memory.

    You could try raising min_free_kbytes though. If that fixes it, then it
    indicates there might be some problem in a memory allocation failure
    path in software raid somewhere.

    Thanks

    --
    SUSE Labs, Novell Inc.


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