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    SubjectRe: New lockless pagecache
    Hi Nick,

    I have collected performance numbers for the lock less page cache
    patch on the AIM - IO test.
    The performance numbers are collected for 1-100 tasks 1-50 tasks and
    90-100 tasks both for with and without your patch. This was done on
    2.6.13 kernel.
    There's definite improvement when the tasks are small i.e ~50-70. But
    when the tasks go beyond 80, we see a large performance dip.
    I again profiled the 90-100 runs with spinlock's inlined, but couldn't
    understand the reason behind the performance difference.

    Please find attached the performance numbers as well as the oprofile logs.

    Thanks & Regards,

    On 9/2/05, Nick Piggin <> wrote:
    > Nick Piggin wrote:
    > > I think this is getting pretty stable. No guarantees of course,
    > > but it would be great if anyone gave it a test.
    > >
    > Or review, I might add. While I understand such a review is
    > still quite difficult, this code really is far less complex
    > than the previous lockless pagecache patches.
    > (Ignore 1/7 though, which is a rollup - a broken out patchset
    > can be provided on request)
    > Nick
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    A computer scientist is someone who, when told to "Go to Hell," sees
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    Alok Kataria
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