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    SubjectRe: Latency tests with 2.6.12-rc1

    * Lee Revell <rlrevell@joe-job.com> wrote:

    > I did the same quick latency tests with 2.6.12-rc1 that I posted about
    > for 2.6.11 a few weeks ago.
    >
    > 2.6.12-rc1 is significantly better than 2.6.11. Running JACK at 64
    > frames (1.3 ms) works very well. I was not able to produce xruns even
    > with "dbench 64", which slows the system to a crawl. With 2.6.11, I
    > could easily produce xruns with much lighter loads.
    >
    > It would appear that the latency issues related to the 4 level page
    > tables merge have been resolved.

    great! The change in question is most likely the copy_page_range() fix
    that Hugh resurrected:

    ChangeSet 1.2037, 2005/03/08 09:26:46-08:00, hugh@veritas.com

    [PATCH] copy_pte_range latency fix

    Ingo's patch to reduce scheduling latencies, by checking for lockbreak in
    copy_page_range, was in the -VP and -mm patchsets some months ago; but got
    preempted by the 4level rework, and not reinstated since. Restore it now
    in copy_pte_range - which mercifully makes it easier.

    are the ext3 related latencies are gone as well - or are you working it
    around by not using data=ordered?

    Ingo
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