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    SubjectRe: [performance bug] kernel building regression on 64 LCPUs machine
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    On Wed, 2011-01-19 at 22:32 +0800, Ted Ts'o wrote:
    > On Wed, Jan 19, 2011 at 09:55:48AM +0800, Alex,Shi wrote:
    > > Shaohua and I tested kernel building performance on latest kernel. and
    > > found it is drop about 15% on our 64 LCPUs NHM-EX machine on ext4 file
    > > system.
    >
    > What kerenl version were you comparing against? And what were you
    > using to benchmark this performance drop? I'm curious what your
    > workload was; I'm guesisng it was some kind of mixed read/write
    > workload? Were there any fsync()'s involved?
    2.6.36 vs 2.6.37. this exists in 2.6.37-rc1. it's a kbuild, no a mixed
    read/write workload. kbuild hasn't fsync involved

    Thanks,
    Shaohua




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