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    SubjectRe: [performance bug] kernel building regression on 64 LCPUs machine
    Jan Kara wrote:
    > On Wed 23-02-11 16:24:47, Alex,Shi wrote:
    >
    >> Though these patches can not totally recovered the problem, but they are
    >> quite helpful with ccache enabled situation. It increase 10% performance
    >> on 38-rc1 kernel.
    >>
    > OK and what was the original performance drop with WRITE_SYNC change?
    >
    The original drop is 30%.
    >
    >> I have tried to enabled they to latest rc6 kernel but failed. the vmstat output is here:
    >> with patches:
    >>
    > I'm attaching patches rebased on top of latest Linus's tree.
    > Corrado, could you possibly run your fsync-heavy tests so that we see
    > whether there isn't negative impact of my patches on your fsync-heavy
    > workload? Thanks.
    >
    > Honza
    >



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