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    SubjectRe: Performance regressions in 2.6.30-rc7?
    Date
    On Sábado 30 Mayo 2009 06:07:18 Andrew Morton escribió:
    > Those regressions are huge. They appear to be on compute-intensive
    > workloads too.
    >
    > I wonder if some expensive debugging option turned itself on or
    > something silly like that.

    They use the vanilla kernels that ubuntu ship with their own configs,
    so they shouldn't be using any expensive debugging option.

    I've run myself two of those tests (I've not tested gnupg as I'm
    allergic to it). I can't reproduce any regression with 7zip, I'm however
    able to reproduce the regression in tiobench write latency, using 32
    threads and 64 MB block size (--threads 32 --block 65536). I used ext4
    (phoronix uses ext3).


    Random Writes
    File Blk Num Avg Maximum Lat% Lat% CPU
    Identifier Size Size Thr Rate (CPU%) Latency Latency >2s >10s Eff
    ---------------------------- ------ ----- --- ------ ------ --------- ----------- -------- -------- -----
    2.6.29 2000 65536 32 24.16 107.2% 0.051 0.21 0.00000 0.00000 23

    Random Writes
    File Blk Num Avg Maximum Lat% Lat% CPU
    Identifier Size Size Thr Rate (CPU%) Latency Latency >2s >10s Eff
    ---------------------------- ------ ----- --- ------ ------ --------- ----------- -------- -------- -----
    2.6.30-rc7-00149-g3218911 2000 65536 32 23.06 178.4% 0.711 164.72 0.00000 0.00000 13

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