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

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Date:	Fri, 4 May 2007 22:10:15 +1000
From:	Con Kolivas <kernel@...ivas.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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

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.

-- 
-ck

View attachment "swap_prefetch_tester.c" of type "text/x-csrc" (2068 bytes)