linux-ext4 - Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent cache

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Date:	Fri, 13 Apr 2012 11:08:20 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>, "Ted Ts'o" <tytso@....edu>,
	Vivek Haldar <haldar@...gle.com>,
	Andreas Dilger <adilger@...ger.ca>, linux-ext4@...r.kernel.org
Subject: Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent cache

On Fri, Apr 13, 2012 at 10:53 AM, Tim Chen <tim.c.chen@...ux.intel.com> wrote:
>>
>> Do you have numbers?
>
> In a benchmark that does mmaped-read, there is a 28% speed up
> after getting rid of the counters.

Ok, that's big. But is it any actual real workload on a real
filesystem? It looks like this should only happen for actual IO, so I
get the feeling that this is some made-up benchmark for a filesystem
on a RAM-disk?

                  Linus
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