linux-kernel - Re: PERF: performance tests with the split LRU VM in -mm

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Date:	Tue, 29 Jul 2008 09:16:50 -0400
From:	Rik van Riel <riel@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, akpm@...ux-foundation.org
Subject: Re: PERF: performance tests with the split LRU VM in -mm

On Tue, 29 Jul 2008 22:04:16 +0900
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> >   TEST 1: dd if=/dev/sda of=/dev/null bs=1M
> > 
> > kernel  speed    swap used
> > 
> > 2.6.26  111MB/s  500kB
> > -mm     110MB/s  59MB     (ouch, system noticably slower)
> > noforce	111MB/s  128kB
> > stream  108MB/s  0        (slight regression, not sure why yet)
> 
> I tried to reproduce it, my ia64 result was
> 
> kernel                   speed        swap used
> 2.6.26-rc8               49.8MB/s     1M
> 2.6.26-rc8-mm1           47.6MB/s     168M
> -mm with above two patch 50.2MB/s     0
> 
> 
> So, I think it isn't regression.

Agreed.  It looked like it, but once I changed the cpuspeed
governor from ondemand to performance, I saw that it had to
be an artifact of something else.

Getting rid of the swap use from a linear IO is the important
part.

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