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    SubjectRe: [BENCHMARK] 2.4.{18,19{-ck9},20rc1{-aa1}} with contest
    On Fri, Nov 08 2002, Andrew Morton wrote:
    > Con Kolivas wrote:
    > >
    > > -----BEGIN PGP SIGNED MESSAGE-----
    > > Hash: SHA1
    > >
    > > >Con Kolivas wrote:
    > > >> io_load:
    > > >> Kernel [runs] Time CPU% Loads LCPU% Ratio
    > > >> 2.4.18 [3] 474.1 15 36 10 6.64
    > > >> 2.4.19 [3] 492.6 14 38 10 6.90
    > > >> 2.4.19-ck9 [2] 140.6 49 5 5 1.97
    > > >> 2.4.20-rc1 [2] 1142.2 6 90 10 16.00
    > > >> 2.4.20-rc1aa1 [1] 1132.5 6 90 10 15.86
    > > >
    > > >2.4.20-pre3 included some elevator changes. I assume they are the
    > > >cause of this. Those changes have propagated into Alan's and Andrea's
    > > >kernels. Hence they have significantly impacted the responsiveness
    > > >of all mainstream 2.4 kernels under heavy writes.
    > > >
    > > >(The -ck patch includes rmap14b which includes the read-latency2 thing)
    > >
    > > Thanks for the explanation. I should have said this was ck with compressed
    > > caching; not rmap.
    > >
    >
    > hrm. In that case I'll shut up with the speculating.
    >
    > You're showing a big shift in behaviour between 2.4.19 and 2.4.20-rc1.
    > Maybe it doesn't translate to worsened interactivity. Needs more
    > testing and anaysis.

    The merging and seek accounting in 2.4.19 is completely off, it doesn't
    make any sense. 2.4.20-rc1 should be sanely tweakable.

    --
    Jens Axboe

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