linux-kernel - Re:swap prefetch improvements

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Date:	Thu, 31 May 2007 12:03:02 +1000
From:	Con Kolivas <kernel@...ivas.org>
To:	"Antonino Ingargiola" <tritemio@...il.com>
Cc:	"ck list" <ck@....kolivas.org>,
	"linux kernel mailing list" <linux-kernel@...r.kernel.org>
Subject: Re:swap prefetch improvements

On Wednesday 30 May 2007 05:59, Antonino Ingargiola wrote:
> 2007/5/29, Antonino Ingargiola <tritemio@...il.com>:
> [cut]
>
> > Swap Prefetch OFF
> > # ./sp_tester
> > Ram 776388000  Swap 514040000
> > Total ram to be malloced: 1033408000 bytes
> > Starting first malloc of 516704000 bytes
> > Starting 1st read of first malloc
> > Touching this much ram takes 1642 milliseconds
> > Starting second malloc of 516704000 bytes
> > Completed second malloc and free
> > Sleeping for 60 seconds
> > Important part - starting reread of first malloc
> > Completed read of first malloc
> > Timed portion 9089 milliseconds
> >
> >
> > Swap Prefetch OFF
> > # ./sp_tester
> > Ram 776388000  Swap 514040000
> > Total ram to be malloced: 1033408000 bytes
> > Starting first malloc of 516704000 bytes
> > Starting 1st read of first malloc
> > Touching this much ram takes 1635 milliseconds
> > Starting second malloc of 516704000 bytes
> > Completed second malloc and free
> > Sleeping for 60 seconds
> > Important part - starting reread of first malloc
> > Completed read of first malloc
> > Timed portion 1783 milliseconds
>
> The second case is clearly with swap prefetch *ON*, sorry.

Thanks very much for testing! The patch has been taken up by Andrew for the 
next -mm.

どうも
-- 
-ck
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