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Date:	Fri, 13 Apr 2012 10:53:32 -0700
From:	Tim Chen <>
To:	Linus Torvalds <>
Cc:	Andi Kleen <>, Ted Ts'o <>,
	Vivek Haldar <>,
	Andreas Dilger <>,
Subject: Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent

On Fri, 2012-04-13 at 10:42 -0700, Linus Torvalds wrote:
> On Wed, Apr 11, 2012 at 9:59 AM, Andi Kleen <> wrote:
> >
> > Ping. This scalability problem is still in 3.4-rc* and causes
> > major slowdowns.
> Do you have numbers?

In a benchmark that does mmaped-read, there is a 28% speed up
after getting rid of the counters.

> > Can we please revert fix it or revert
> > 556b27abf73833923d5cd4be80006292e1b31662 before release.
> That commit ID doesn't make any sense, and doesn't seem to have
> anything to do with any statistics counters that your email talks
> about. So regardless, you'd need to explain why that commit causes the
> problems you talk about, I'm not going to revert a random commit that
> doesn't even look what you describe.
> Ted?
>                 Linus

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