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Message-Id: <200705311203.02582.kernel@kolivas.org>
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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