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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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