From: "Dan Maas" <dmaas@dcine.com>
To: "J.A. Magallon" <jamagallon@able.es>
Cc: <linux-kernel@vger.kernel.org>, "war" <war@starband.net>,
<stilgar2k@wanadoo.fr>
Subject: Re: Swap
Date: Sun, 18 Nov 2001 17:15:36 -0500 [thread overview]
Message-ID: <053d01c1707e$8c941630$1a01a8c0@allyourbase> (raw)
In-Reply-To: <fa.inl6g6v.1mmbp4@ifi.uio.no> <fa.heevhav.sjs8an@ifi.uio.no>
> >Yep. There's a reason for that: the kernel is *ALWAYS*
> >able to swap pages out to disk - even without "swap space".
> >Disabling swapspace simply forces the kernel to swap out
> >more code, since it cannot swap out any data.
>
> Sure ??? Where ?? What disk space uses it to swap pages to ?
The executables and binaries on your regular filesystems... Even with no
swap space, the kernel can "page out" (i.e. drop from memory) read-only file
mappings, since they can always be reloaded from disk if needed.
In other words, there is still a big difference between running without swap
space, and having every program do an mlockall() (which *really* forces all
pages to be permanently resident in RAM).
Still, it puzzles me why a system with no swap space would appear to be more
responsive than one with swap (assuming their working sets are quite a bit
smaller than total amount of RAM)... Can you do a controlled test somehow,
to rule out any sort of placebo effect?
Regards,
Dan
next parent reply other threads:[~2001-11-18 22:28 UTC|newest]
Thread overview: 108+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.inl6g6v.1mmbp4@ifi.uio.no>
[not found] ` <fa.heevhav.sjs8an@ifi.uio.no>
2001-11-18 22:15 ` Dan Maas [this message]
2001-11-18 22:43 ` Swap François Cami
2001-11-19 9:18 ` Swap James A Sutherland
2001-11-19 10:51 ` Swap Remco Post
2001-11-19 13:33 ` Swap James A Sutherland
2001-11-19 13:46 ` Swap Remco Post
2001-11-19 16:58 ` Swap Rik van Riel
[not found] ` <Pine.LNX.4.33L.0111191458150.1491-100000@duckman.distro.conecti va>
2001-11-19 21:13 ` Swap Alex Bligh - linux-kernel
2001-11-19 21:17 ` Swap Rik van Riel
[not found] ` <Pine.LNX.4.33L.0111191917000.1491-100000@duckman.distro.conecti va>
2001-11-19 21:52 ` Swap Alex Bligh - linux-kernel
2001-11-19 16:36 ` Swap Jesse Pollard
2001-11-20 14:51 ` Swap J.A. Magallon
2001-11-20 16:01 ` Swap Wolfgang Rohdewald
2001-11-20 16:06 ` Swap Remco Post
2001-11-20 16:12 ` Swap Nick LeRoy
2001-11-20 16:20 ` Swap Richard B. Johnson
2001-11-20 17:14 ` Swap Christopher Friesen
2001-11-20 17:40 ` Swap Richard B. Johnson
2001-11-20 18:14 ` Swap Nick LeRoy
2001-11-21 10:17 ` Swap Helge Hafting
2001-11-21 11:17 ` Swap Alan Cox
2001-11-20 23:20 ` Swap Luigi Genoni
2001-11-21 16:44 ` Swap Remco Post
2001-11-20 17:58 ` Swap Wolfgang Rohdewald
2001-11-26 21:51 ` [Linux-abi-devel] Swap Christoph Hellwig
2001-11-20 21:05 ` Swap Steffen Persvold
2001-11-20 21:18 ` Swap Mike Fedyk
2001-11-20 21:33 ` Swap Nick LeRoy
2001-11-20 21:44 ` Swap Mike Fedyk
2001-11-20 22:00 ` Swap Nick LeRoy
2001-11-21 16:53 ` Swap Remco Post
2001-11-20 21:43 ` Swap Richard B. Johnson
2001-11-20 21:50 ` NFS, Paging & Installing [was: Re: Swap] Mike Fedyk
2001-11-21 1:22 ` Horst von Brand
2001-11-21 1:46 ` Mike Fedyk
2001-11-21 10:55 ` Trond Myklebust
2001-11-22 5:16 ` Bernd Eckenfels
2001-11-22 12:19 ` Trond Myklebust
2001-11-23 19:33 ` Mike Fedyk
2001-11-20 21:19 ` Swap Nick LeRoy
2001-11-21 16:48 ` Swap Remco Post
2001-11-20 20:58 ` Swap Mike Fedyk
2001-11-19 10:03 ` Swap Tim Connors
2001-11-19 10:16 ` Swap Dan Maas
[not found] <fa.kb6ct7v.pgku0d@ifi.uio.no>
[not found] ` <fa.k8qdvcv.184ak2l@ifi.uio.no>
2001-11-20 22:46 ` Swap Dan Maas
2001-11-20 23:17 ` Swap Trond Myklebust
[not found] <fa.kmf405v.j74f21@ifi.uio.no>
[not found] ` <fa.ns5ugpv.q02sbg@ifi.uio.no>
2001-11-20 21:26 ` Swap Dan Maas
2001-11-20 22:05 ` Swap Rik van Riel
2001-11-20 22:11 ` Swap David S. Miller
2001-11-20 22:19 ` Swap Rik van Riel
2001-11-20 22:34 ` Swap Dan Maas
2001-11-20 23:05 ` Swap Andrew Morton
[not found] ` <fa.jc73ejv.1s6e80t@ifi.uio.no>
2001-11-21 1:45 ` Swap Håvard Kvålen
2001-11-21 4:23 ` Swap Andreas Dilger
2001-11-20 22:23 ` Swap Andrew Morton
2001-11-20 23:01 ` Swap David S. Miller
2001-11-20 23:35 ` Swap Rik van Riel
2001-11-20 23:40 ` Swap David S. Miller
2001-11-21 0:19 ` Swap Rik van Riel
2001-11-21 0:21 ` Swap David S. Miller
2001-11-18 21:12 Swap war
2001-11-18 21:25 ` Swap James A Sutherland
2001-11-18 21:28 ` Swap war
2001-11-18 21:42 ` Swap François Cami
2001-11-18 21:45 ` Swap war
2001-11-18 23:03 ` Swap Erik Gustavsson
2001-11-19 18:12 ` Swap Eric W. Biederman
2001-11-19 18:43 ` Swap Rik van Riel
2001-11-20 2:49 ` Swap Eric W. Biederman
2001-11-20 3:33 ` Swap Ryan Cumming
2001-11-20 11:43 ` Swap Rik van Riel
2001-11-20 11:41 ` Swap Rik van Riel
2001-11-19 19:12 ` Swap James A Sutherland
2001-11-20 2:47 ` Swap Eric W. Biederman
2001-11-20 9:16 ` Swap James A Sutherland
2001-11-18 22:05 ` Swap J.A. Magallon
2001-11-18 22:21 ` Swap François Cami
2001-11-18 22:36 ` Swap Charles Marslett
2001-11-18 22:54 ` Swap J.A. Magallon
2001-11-18 23:36 ` Swap Bernd Eckenfels
-- strict thread matches above, loose matches on Subject: below --
2001-10-18 5:06 RFC - tree quotas for Linux (2.4.12, ext2) Neil Brown
2001-10-18 5:53 ` Ben Greear
2001-10-18 8:38 ` James Sutherland
2001-10-18 20:20 ` Mike Fedyk
2001-10-18 20:47 ` Tim Walberg
2001-10-19 1:07 ` Neil Brown
2001-10-19 3:03 ` Rik van Riel
2001-10-19 11:50 ` Horst von Brand
2001-10-19 17:00 ` Mike Fedyk
2001-10-18 21:17 ` Andreas Dilger
2001-10-18 22:56 ` Mike Fedyk
2001-10-19 0:14 ` Horst von Brand
2001-10-19 0:51 ` Mike Fedyk
2001-10-19 1:13 ` Neil Brown
2001-10-19 0:53 ` Neil Brown
2001-10-24 15:16 ` Jan Kara
2001-10-24 15:34 ` James Sutherland
2001-10-24 15:39 ` Jan Kara
2001-10-24 15:50 ` James Sutherland
2001-10-24 17:41 ` Rik van Riel
2001-10-24 18:08 ` James Sutherland
2001-10-26 11:25 ` Pavel Machek
2001-10-24 21:24 ` Neil Brown
2001-10-25 15:48 ` Jan Kara
2001-10-26 4:36 ` Neil Brown
2001-10-29 14:06 ` Jan Kara
2001-10-29 23:23 ` Neil Brown
2001-10-30 12:33 ` Jan Kara
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