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    SubjectRe: Adaptive Readahead V14 - statistics question...
    On Thu, 1 Jun 2006 13:51:43 +0800 Fengguang Wu wrote:
    > On Wed, May 31, 2006 at 11:50:21PM +0200, Voluspa wrote:
    > > _Massive READ_
    > >
    > > [/usr had some 490000 files]
    > >
    > > "cd /usr ; time find . -type f -exec md5sum {} \;"
    > >
    > > 2.6.17-rc5 ------- 2.6.17-rc5-ar
    > >
    > > real 21m21.009s -- 21m37.663s
    > > user 3m20.784s -- 3m20.701s
    > > sys 6m34.261s -- 6m41.735s
    > >
    > > I had planned to run this at least three times, but didn't realize I had
    > > 12 compiled kernel trees and 3 uncompiled there... So, a one-shot had to
    > > do. But it's still significant.
    >
    > Sorry, it is a known regression. I'd like to fix it in the next
    > release.

    That's cool. I had fun testing (I'm weird) and now have a fixed procedure
    to monitor your future work. When/if it hits mainline I'll both back it out
    and switch it on/off. Then shout WOLF if I see a regression anywhere ;)

    There's still the readahead size to adjust. I'll return with my findings.

    Mvh
    Mats Johannesson
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