From: Jamie Lokier <jamie@shareable.org>
To: Chase Venters <chase.venters@clientec.com>
Cc: Michael Loftis <mloftis@wgops.com>,
"Barry K. Nathan" <barryn@pobox.com>, Al Boldi <a1426z@gawab.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [RFC] VM: I have a dream...
Date: Mon, 23 Jan 2006 13:17:07 +0000 [thread overview]
Message-ID: <20060123131707.GA20163@mail.shareable.org> (raw)
In-Reply-To: <200601222346.24781.chase.venters@clientec.com>
Chase Venters wrote:
> Just as a curiosity... does anyone have any guesses as to the
> runtime performance cost of hosting one or more swap files (which
> thanks to on demand creation and growth are presumably built of
> blocks scattered around the disk) versus having one or more simple
> contiguous swap partitions?
> I think it's probably a given that swap partitions are better; I'm just
> curious how much better they might actually be.
When programs must access files in addition to swapping, and that
includes demand-paged executable files, swap files have the
_potential_ to be faster because they provide opportunities to use the
disk nearer the files which are being accessed. This is more so is
all the filesystem's free space is available for swapping. A swap
partition in this scenario forces the disk head to move back and forth
between the swap partition and the filesystem.
-- Jamie
next prev parent reply other threads:[~2006-01-23 13:17 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-21 18:08 [RFC] VM: I have a dream Al Boldi
2006-01-21 18:42 ` Jamie Lokier
2006-01-21 18:46 ` Avi Kivity
2006-01-23 19:52 ` Bryan Henderson
2006-01-25 22:04 ` Al Boldi
2006-01-26 19:18 ` Bryan Henderson
2006-01-27 16:12 ` Al Boldi
2006-01-27 19:17 ` Bryan Henderson
2006-01-30 13:21 ` Al Boldi
2006-01-30 13:35 ` Kyle Moffett
2006-01-31 15:56 ` Al Boldi
2006-01-31 16:34 ` Kyle Moffett
2006-01-31 23:14 ` Bryan Henderson
2006-01-31 16:34 ` Lennart Sorensen
2006-01-31 19:23 ` Jamie Lokier
2006-02-01 4:06 ` Barry K. Nathan
2006-02-02 15:11 ` Alan Cox
2006-02-02 18:59 ` Al Boldi
2006-02-02 22:33 ` Bryan Henderson
2006-02-03 14:46 ` Alan Cox
2006-01-30 16:49 ` Bryan Henderson
2006-01-26 0:03 ` Jon Smirl
2006-01-26 19:48 ` Bryan Henderson
2006-01-22 8:16 ` Pavel Machek
2006-01-22 12:33 ` Robin Holt
2006-01-23 18:03 ` Al Boldi
2006-01-23 18:40 ` Valdis.Kletnieks
2006-01-23 19:26 ` Benjamin LaHaise
2006-01-23 19:40 ` Valdis.Kletnieks
2006-01-23 22:26 ` Pavel Machek
2006-01-22 19:55 ` Barry K. Nathan
2006-01-23 5:23 ` Michael Loftis
2006-01-23 5:46 ` Chase Venters
2006-01-23 8:20 ` Barry K. Nathan
2006-01-23 13:17 ` Jamie Lokier [this message]
2006-01-23 20:21 ` Peter Chubb
2006-01-23 15:05 ` Ram Gupta
2006-01-23 15:26 ` Diego Calleja
2006-01-23 16:11 ` linux-os (Dick Johnson)
2006-01-23 16:50 ` Jamie Lokier
2006-01-24 2:08 ` Horst von Brand
2006-01-25 6:13 ` Jamie Lokier
2006-01-25 9:23 ` Bernd Petrovitsch
2006-01-25 9:42 ` Lee Revell
2006-01-25 15:02 ` Jamie Lokier
2006-01-25 23:24 ` Lee Revell
2006-01-25 15:05 ` Jamie Lokier
2006-01-25 15:47 ` Bernd Petrovitsch
2006-01-25 16:09 ` Diego Calleja
2006-01-25 17:26 ` Jamie Lokier
2006-01-26 19:13 ` Bryan Henderson
2006-01-25 23:28 ` Lee Revell
2006-01-26 1:29 ` Diego Calleja
2006-01-26 5:01 ` Jamie Lokier
2006-01-26 5:11 ` Lee Revell
2006-01-26 14:46 ` Dave Kleikamp
2006-01-24 2:10 ` Horst von Brand
2006-01-25 22:27 ` Nix
2006-01-26 15:13 ` Denis Vlasenko
2006-01-26 16:23 ` Nix
2006-01-23 20:43 ` Michael Loftis
2006-01-23 22:42 ` Nikita Danilov
2006-01-24 14:36 ` Ram Gupta
2006-01-24 15:04 ` Diego Calleja
2006-01-24 20:59 ` Bryan Henderson
2006-01-24 15:11 ` Nikita Danilov
2006-01-23 22:57 ` Ram Gupta
-- strict thread matches above, loose matches on Subject: below --
2006-02-01 13:58 Al Boldi
2006-02-01 14:38 ` Jamie Lokier
2006-02-02 12:26 ` Al Boldi
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