From: Andrea Arcangeli <andrea@suse.de>
To: Rik van Riel <riel@conectiva.com.br>
Cc: Linus Torvalds <torvalds@transmeta.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] dcache 2nd chance replacement
Date: Wed, 3 Jan 2001 22:12:21 +0100 [thread overview]
Message-ID: <20010103221221.I32185@athlon.random> (raw)
In-Reply-To: <20010103204354.E32185@athlon.random> <Pine.LNX.4.21.0101031745380.1403-100000@duckman.distro.conectiva>
In-Reply-To: <Pine.LNX.4.21.0101031745380.1403-100000@duckman.distro.conectiva>; from riel@conectiva.com.br on Wed, Jan 03, 2001 at 05:47:39PM -0200
On Wed, Jan 03, 2001 at 05:47:39PM -0200, Rik van Riel wrote:
> Not really. Under very high VFS loads we'd just scan
> through the list twice and free the entries anyway.
You're obviously wrong.
The higher was the load, the faster your working set was getting dropped from
the dcache. (with the patch the working set will have a chance to remains in
cache also with polluting going on instead, that's the whole point of aging:
to find out if something is worthwhile to keep in cache or not)
So the higher the VFS load definitely the higher improvement you will get.
The example with only pollution in the cache doesn't make sense, if you want to
optimize that case then remove the dcache in first place since it's only
overhead for such case.
Andrea
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next prev parent reply other threads:[~2001-01-03 21:12 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-03 18:59 [PATCH] dcache 2nd chance replacement Rik van Riel
2001-01-03 19:05 ` Linus Torvalds
2001-01-03 19:11 ` Rik van Riel
2001-01-03 19:43 ` Andrea Arcangeli
2001-01-03 19:47 ` Rik van Riel
2001-01-03 21:12 ` Andrea Arcangeli [this message]
2001-01-03 23:09 ` Rik van Riel
2001-01-04 0:32 ` Andrea Arcangeli
2001-01-04 15:00 ` Rik van Riel
2001-01-04 16:18 ` Andrea Arcangeli
2001-01-04 16:23 ` Rik van Riel
2001-01-04 16:52 ` Andrea Arcangeli
2001-01-04 16:59 ` Rik van Riel
2001-01-04 17:35 ` Andrea Arcangeli
2001-01-04 17:36 ` Rik van Riel
2001-01-04 17:47 ` Alan Cox
2001-01-05 12:08 ` Chris Evans
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