linux-kernel - Re: swap-prefetch: 2.6.22 -mm merge plans

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Date:	Mon, 07 May 2007 10:28:56 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Con Kolivas <kernel@...ivas.org>
CC:	Ingo Molnar <mingo@...e.hu>, Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: swap-prefetch: 2.6.22 -mm merge plans

Con Kolivas wrote:
> On Friday 04 May 2007 18:52, Ingo Molnar wrote:
>> agreed. Con, IIRC you wrote a testcase for this, right? Could you please
>> send us the results of that testing?
> 
> Yes, sorry it's a crappy test app but works on 32bit. Timed with prefetch 
> disabled and then enabled swap prefetch saves ~5 seconds on average hardware 
> on this one test case. I had many users try this and the results were between 
> 2 and 10 seconds, but always showed a saving on this testcase. This effect 
> easily occurs on printing a big picture, editing a large file, compressing an 
> iso image or whatever in real world workloads. Smaller, but much more 
> frequent effects of this over the course of a day obviously also occur and do 
> add up.
> 
I'll try this when I get the scheduler stuff done, and also dig out the 
"resp1" stuff for "back when." I see the most recent datasets were 
comparing 2.5.43-mm2 responsiveness with 2.4.19-ck7, you know I always 
test your stuff ;-)

Guess it might need a bit of polish for current hardware, I was testing 
on *small* machines, deliberately.

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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