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    SubjectRe: Where is the performance bottleneck?
    Holger Kiehl wrote:

    > 3236497 total 1.4547
    > 2507913 default_idle 52248.1875
    > 158752 shrink_zone 43.3275
    > 121584 copy_user_generic_c 3199.5789
    > 34271 __wake_up_bit 713.9792
    > 31131 __make_request 23.1629
    > 22096 scsi_request_fn 18.4133
    > 21915 rotate_reclaimable_page 80.5699
    ^^^^^^^^^

    I don't think this function should be here. This indicates that
    lots of writeout is happening due to pages falling off the end
    of the LRU.

    There was a bug recently causing memory estimates to be wrong
    on Opterons that could cause this I think.

    Can you send in 2 dumps of /proc/vmstat taken 10 seconds apart
    while you're writing at full speed (with 2.6.13 or the latest
    -git tree).

    A dump of /proc/zoneinfo and /proc/meminfo while the write is
    going on would be helpful too.

    Thanks,
    Nick

    --
    SUSE Labs, Novell Inc.

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