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Date: Tue, 29 May 2007 21:59:34 +0200
From: "Antonino Ingargiola" <tritemio@...il.com>
To: "Con Kolivas" <kernel@...ivas.org>
Cc: "ck list" <ck@....kolivas.org>,
"linux kernel mailing list" <linux-kernel@...r.kernel.org>
Subject: Re: [ck] 2.6.22-rc3-ck1
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.
~ Antonio
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