Messages in this thread | | | Date | Fri, 25 Feb 2011 08:44:38 +0800 | From | Alex Shi <> | Subject | Re: [performance bug] kernel building regression on 64 LCPUs machine |
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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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