From: Con Kolivas <kernel@kolivas.org>
To: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Cc: linux kernel mailing list <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>, ck list <ck@vds.kolivas.org>
Subject: Re: [PATCH] mm - swap prefetch magnify
Date: Sun, 23 Oct 2005 01:21:30 +1000 [thread overview]
Message-ID: <200510230121.31048.kernel@kolivas.org> (raw)
In-Reply-To: <4d8e3fd30510220241i6c370dd1x512561cb6a1bc250@mail.gmail.com>
On Sat, 22 Oct 2005 19:41, Paolo Ciarrocchi wrote:
> On 10/22/05, Con Kolivas <kernel@kolivas.org> wrote:
> > On Sat, 22 Oct 2005 11:20, Con Kolivas wrote:
> > > Testing has confirmed much larger prefetch values work well.
> >
> > Bah.. Sorry take this one instead. Just make sure that no matter how
> > little ram we have prefetch is enabled.
>
> Con,
> would you be so kind to post more information about the test you've done ?
My concern was to not cause a detriment to performance in any noticeable way.
The prefetch sizes were tested on a number of machines with different speed
hard drive / ram size combinations to ensure none of the default values ever
caused any significant I/O wait, or that heavy memory requiring compiles took
any longer to complete as these constantly need new ram allocations and I
wanted to ensure that prefetching into ram didn't slow down those
allocations. Furthermore, the time taken to actually prefetch the application
is now more than 5 times faster because of the larger default prefetch
values.
Cheers,
Con
prev parent reply other threads:[~2005-10-22 15:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-22 1:20 [PATCH] mm - swap prefetch magnify Con Kolivas
2005-10-22 1:47 ` Con Kolivas
2005-10-22 9:41 ` Paolo Ciarrocchi
2005-10-22 15:21 ` Con Kolivas [this message]
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