From: Chris Evans <chris@ferret.lmh.ox.ac.uk>
To: Rik van Riel <H.H.vanRiel@phys.uu.nl>
Cc: Linux MM <linux-mm@kvack.org>,
Linux Kernel <linux-kernel@vger.rutgers.edu>
Subject: Re: [PATCH] swapin readahead and fixes
Date: Fri, 4 Dec 1998 19:25:31 +0000 (GMT) [thread overview]
Message-ID: <Pine.LNX.3.96.981204192244.28834B-100000@ferret.lmh.ox.ac.uk> (raw)
In-Reply-To: <Pine.LNX.3.96.981203184928.2886A-100000@mirkwood.dummy.home>
On Thu, 3 Dec 1998, Rik van Riel wrote:
> Hi,
>
> here is a patch (against 2.1.130, but vs. 2.1.131 should
> be trivial) that improves the swapping performance both
> during swapout and swapin and contains a few minor fixes.
Hi Rik,
I'm very interested in performance for sequential swapping. This occurs in
for example scientific applications which much sweep through vast arrays
much larger than physical RAM.
Have you benchmarked booting with low physical RAM, lots of swap and
writing a simple program that allocates 100's of Mb of memory and then
sequentially accesses every page in a big loop?
This is one area in which FreeBSD stomps on us. Theoretically it should be
possible to get swap with readahead pulling pages into RAM at disk speed.
Cheers
Chris
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next prev parent reply other threads:[~1998-12-04 19:25 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-03 17:56 Rik van Riel
1998-12-04 11:34 ` Stephen C. Tweedie
1998-12-04 14:02 ` Rik van Riel
1998-12-04 14:34 ` Stephen C. Tweedie
1998-12-05 9:46 ` Gerard Roudier
1998-12-07 16:50 ` Stephen C. Tweedie
1998-12-08 1:34 ` Billy Harvey
1998-12-08 2:31 ` Rik van Riel
1998-12-08 2:51 ` Billy Harvey
1998-12-08 3:00 ` Rik van Riel
1998-12-08 12:35 ` Stephen C. Tweedie
1998-12-08 13:51 ` Rik van Riel
1998-12-09 2:41 ` Drago Goricanec
1998-12-09 11:58 ` Stephen C. Tweedie
1998-12-08 12:21 ` Stephen C. Tweedie
1998-12-05 10:47 ` Gerard Roudier
1998-12-04 19:25 ` Chris Evans [this message]
1998-12-04 20:47 ` Rik van Riel
1998-12-05 18:59 ` Alan Cox
1998-12-05 19:02 ` Rik van Riel
1998-12-06 5:20 ` Rik van Riel
1998-12-06 5:23 ` Steve VanDevender
1998-12-07 11:52 ` Rik van Riel
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