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Date:	Fri, 13 Apr 2012 14:48:23 -0400
From:	Ted Ts'o <>
To:	Andi Kleen <>
Cc:	Tim Chen <>,
	Linus Torvalds <>,
	Vivek Haldar <>,
	Andreas Dilger <>,
Subject: Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent

On Fri, Apr 13, 2012 at 08:41:58PM +0200, Andi Kleen wrote:
> > The reason why I ask this is we're seeing anything like this with Eric
> > Whitney's 48 CPU scalability testing; we're not CPU bottlenecked, and
> > I don't even see evidence of a larger than usual CPU utilization
> > compared to other file systems.
> I bet Eric didn't test with this statistic counter.

Huh?  You can't turn it off, and he's been doing regular scalability
tests at least once per kernel release.

Can you say a bit more about exactly how you are doing this test and
what are the "other issues" where this is becoming a bottleneck?  If
possible I'd like to ask Eric if he can add it to his regular
scalability tests.


						 - Ted
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