Re: [performance bug] kernel building regression on 64 LCPUs machine

[Alex Shi]

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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