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From: Andrew Morton <akpm@digeo.com>
To: Daniel Phillips <phillips@arcor.de>
Cc: Linus Torvalds <torvalds@transmeta.com>,
	"Martin J. Bligh" <mbligh@aracnet.com>,
	Oliver Neukum <oliver@neukum.name>,
	Rob Landley <landley@trommello.org>,
	linux-kernel@vger.kernel.org
Subject: Re: The reason to call it 3.0 is the desktop (was Re: [OT] 2.6 not 3.0  -  (NUMA))
Date: Mon, 07 Oct 2002 13:14:23 -0700	[thread overview]
Message-ID: <3DA1EB1F.C992353@digeo.com> (raw)
In-Reply-To: E17ye5U-0003ul-00@starship

Daniel Phillips wrote:
> 
> This is easy to verify: say you have 100 MB of kernel source stored in, say,
> 50 different clumps on disk.

Disks use segmentation on their readahead buffers.  Typically four-way.
So they will only buffer four different chunks of disk at a time.

If you're reading from 50 different places on disk, the disk keeps
invalidating readahead at the segment level.

  reply	other threads:[~2002-10-07 20:10 UTC|newest]

Thread overview: 206+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-24  1:54 [PATCH-RFC] 4 of 4 - New problem logging macros, SCSI RAID device driver Larry Kessler
2002-09-24  2:22 ` Jeff Garzik
2002-09-26 15:52   ` Alan Cox
2002-09-26 22:55     ` [PATCH-RFC] 4 of 4 - New problem logging macros, SCSI RAIDdevice driver Larry Kessler
2002-09-26 22:58       ` Jeff Garzik
2002-09-26 23:07         ` Linus Torvalds
2002-09-27  2:27           ` Jeff Garzik
2002-09-27  4:45             ` Linus Torvalds
2002-09-28  7:46               ` Ingo Molnar
2002-09-28  9:16                 ` jw schultz
2002-09-30 14:05                   ` Denis Vlasenko
2002-09-30 10:22                     ` Tomas Szepe
2002-09-30 11:10                       ` jw schultz
2002-09-30 11:17                       ` Adrian Bunk
2002-09-30 19:48                       ` Rik van Riel
2002-09-30 20:30                         ` Christoph Hellwig
2002-09-28 15:40                 ` Kernel version [Was: Re: [PATCH-RFC] 4 of 4 - New problem logging macros, SCSI RAIDdevice driver] Horst von Brand
2002-09-29  1:31                 ` v2.6 vs v3.0 Linus Torvalds
2002-09-29  6:14                   ` james
2002-09-29  6:55                     ` Andre Hedrick
2002-09-29 12:59                     ` Gerhard Mack
2002-09-29 13:46                       ` Dr. David Alan Gilbert
2002-09-29 14:06                         ` Wakko Warner
2002-09-29 15:42                         ` Jens Axboe
2002-09-29 16:21                           ` Alan Cox
2002-09-29 16:17                             ` Jens Axboe
2002-09-30  0:39                             ` Jeff Chua
2002-09-29 16:22                           ` Dave Jones
2002-09-29 16:26                             ` Jens Axboe
2002-09-29 21:46                             ` Matthias Andree
2002-09-30  7:05                               ` Michael Clark
2002-09-30  7:22                                 ` Andrew Morton
2002-09-30 13:08                                   ` Kevin Corry
2002-09-30 13:05                                 ` Kevin Corry
2002-09-30 13:49                                   ` Michael Clark
2002-09-30 14:26                                     ` Kevin Corry
2002-09-30 13:59                                   ` Michael Clark
2002-09-30 15:50                                     ` Kevin Corry
2002-09-29 17:06                       ` Jochen Friedrich
2002-09-29 15:18                     ` Trever L. Adams
2002-09-29 15:45                       ` Jens Axboe
2002-09-29 15:59                         ` Trever L. Adams
2002-09-29 16:06                           ` Jens Axboe
2002-09-29 16:13                             ` Trever L. Adams
2002-09-30  6:54                               ` Kai Henningsen
2002-09-30 18:40                                 ` Bill Davidsen
2002-10-01 12:38                                   ` Matthias Andree
2002-10-04 19:58                                     ` Bill Davidsen
2002-09-29 17:42                     ` Linus Torvalds
2002-09-29 17:54                       ` Rik van Riel
2002-09-29 18:24                       ` Alan Cox
2002-09-30  7:56                         ` Jens Axboe
2002-09-30  9:53                           ` Andre Hedrick
2002-09-30 11:54                             ` Jens Axboe
2002-09-30 12:58                           ` Alan Cox
2002-09-30 13:05                             ` Jens Axboe
2002-10-01  2:17                               ` Andre Hedrick
2002-09-30 16:39                       ` jbradford
2002-09-30 16:47                     ` Pau Aliagas
2002-09-29  7:16                   ` jbradford
2002-09-29  8:08                     ` Jeff Garzik
2002-09-29  8:17                     ` David S. Miller
2002-09-29  9:12                     ` Jens Axboe
2002-09-29 11:19                       ` Murray J. Root
2002-09-29 15:50                         ` Jens Axboe
2002-09-30  7:01                           ` Kai Henningsen
2002-09-29 16:04                         ` Zwane Mwaikambo
2002-09-29 14:56                       ` Alan Cox
2002-09-29 15:38                         ` Jens Axboe
2002-09-29 16:30                           ` Dave Jones
2002-09-29 16:42                           ` Bjoern A. Zeeb
2002-09-29 21:16                           ` Russell King
2002-09-29 21:32                             ` Alan Cox
2002-09-29 21:49                             ` steve
2002-09-29 21:52                           ` Matthias Andree
2002-09-30  7:31                             ` Tomas Szepe
2002-09-30 15:33                           ` Jan Harkes
2002-09-30 18:13                           ` Jeff Willis
2002-09-29 17:48                         ` Linus Torvalds
2002-09-29 18:13                           ` Jaroslav Kysela
2002-09-30 19:32                       ` Bill Davidsen
2002-10-01  6:26                         ` Jens Axboe
2002-10-01  7:54                           ` Mikael Pettersson
2002-10-01  8:27                             ` Jens Axboe
2002-10-01  8:44                               ` jbradford
2002-10-01 11:31                             ` Alan Cox
2002-10-01 11:25                               ` Jens Axboe
2002-09-29 15:34                     ` Andi Kleen
2002-09-29 17:26                       ` Jochen Friedrich
2002-09-29 17:35                         ` Jeff Garzik
2002-09-30  0:00                         ` Andi Kleen
2002-10-01 19:28                         ` IPv6 stability (success story ;) Petr Baudis
2002-09-29  9:15                   ` v2.6 vs v3.0 Jens Axboe
2002-09-29 19:53                     ` james
2002-09-29 15:26                   ` Matthias Andree
2002-09-29 16:24                     ` Alan Cox
2002-09-29 22:00                       ` Matthias Andree
2002-09-30 19:02                       ` Bill Davidsen
2002-09-30 18:37                   ` Bill Davidsen
2002-10-03 15:51               ` [OT] 2.6 not 3.0 - (WAS Re: [PATCH-RFC] 4 of 4 - New problem logging macros, SCSI RAIDdevice) jbradford
2002-10-03 15:57                 ` Linus Torvalds
2002-10-03 16:16                   ` [OT] 2.6 not 3.0 - (WAS Re: [PATCH-RFC] 4 of 4 - New problem jbradford
2002-10-03 22:30                     ` Greg KH
2002-10-04  6:33                       ` jbradford
2002-10-04  6:37                         ` Greg KH
2002-10-04  7:17                           ` jbradford
2002-10-04  7:30                             ` Greg KH
2002-10-03 16:37                   ` [OT] 2.6 not 3.0 - (WAS Re: [PATCH-RFC] 4 of 4 - New problem logging macros, SCSI RAIDdevice) Alan Cox
2002-10-03 16:56                     ` Linus Torvalds
2002-10-03 17:40                       ` Alan Cox
2002-10-03 19:55                       ` jlnance
2002-10-03 16:51                   ` Dave Jones
2002-10-03 17:04                     ` Alan Cox
2002-10-03 20:43                     ` Andrew Morton
2002-10-03 22:05                       ` Dave Jones
2002-10-04  3:46                         ` Andreas Boman
2002-10-04  7:44                         ` jbradford
2002-10-03 19:51                   ` Rik van Riel
2002-10-04 22:26                   ` [OT] 2.6 not 3.0 - (NUMA) Martin J. Bligh
2002-10-04 23:13                     ` Linus Torvalds
2002-10-05  0:21                       ` Martin J. Bligh
2002-10-05  0:36                         ` Linus Torvalds
2002-10-05  1:25                           ` Michael Hohnbaum
2002-10-05 20:30                       ` The reason to call it 3.0 is the desktop (was Re: [OT] 2.6 not 3.0 - (NUMA)) Rob Landley
2002-10-06  2:15                         ` Andrew Morton
2002-10-06  9:42                           ` Russell King
2002-10-06 17:06                             ` Alan Cox
2002-10-06 13:44                           ` Oliver Neukum
2002-10-06 15:19                             ` Martin J. Bligh
2002-10-06 15:14                               ` Oliver Neukum
2002-10-07  8:08                               ` Helge Hafting
2002-10-07  9:18                                 ` Oliver Neukum
2002-10-07 14:11                                   ` Jan Hudec
2002-10-07 15:01                                     ` Jesse Pollard
2002-10-07 15:34                                       ` Jan Hudec
2002-10-08  3:12                                         ` [OT] " Scott Mcdermott
2002-10-10 23:49                                           ` Mike Fedyk
2002-10-07 15:15                                   ` Martin J. Bligh
2002-10-08 13:49                                   ` Helge Hafting
2002-10-07 17:43                               ` Daniel Phillips
2002-10-07 18:31                                 ` Andrew Morton
2002-10-07 18:51                                   ` Linus Torvalds
2002-10-07 20:14                                     ` Alan Cox
2002-10-07 20:31                                       ` The reason to call it 3.0 is the desktop (was Re: [OT] 2.6 not3.0 " Andrew Morton
2002-10-07 20:46                                         ` Linus Torvalds
2002-10-07 20:44                                       ` The reason to call it 3.0 is the desktop (was Re: [OT] 2.6 not 3.0 " Linus Torvalds
2002-10-07 21:16                                         ` The reason to call it 3.0 is the desktop (was Re: [OT] 2.6 not3.0 " Andrew Morton
2002-10-07 23:47                                           ` jw schultz
2002-10-11  0:02                                           ` Mike Fedyk
2002-10-07 18:58                                   ` The reason to call it 3.0 is the desktop (was Re: [OT] 2.6 not 3.0 " Chris Friesen
2002-10-07 19:21                                     ` Daniel Phillips
2002-10-07 19:35                                       ` Linus Torvalds
2002-10-08  0:39                                         ` Theodore Ts'o
2002-10-08  2:59                                           ` Andrew Morton
2002-10-08 16:15                                             ` Theodore Ts'o
2002-10-08 19:39                                               ` Andrew Morton
2002-10-08 17:06                                                 ` Rob Landley
2002-10-07 19:36                                     ` Andrew Morton
2002-10-08  2:36                                       ` Simon Kirby
2002-10-08  2:47                                         ` Daniel Phillips
2002-10-08  2:50                                         ` Andrew Morton
2002-10-08  2:54                                           ` Simon Kirby
2002-10-08  3:00                                             ` Andrew Morton
2002-10-08 16:17                                               ` Theodore Ts'o
2002-10-08 12:49                                           ` jlnance
2002-10-08 17:09                                             ` Andrew Morton
2002-10-10 20:53                                               ` Thomas Zimmerman
2002-10-08 13:54                                       ` Helge Hafting
2002-10-08 15:31                                         ` Andreas Dilger
2002-10-07 19:05                                   ` Daniel Phillips
2002-10-07 19:24                                     ` Linus Torvalds
2002-10-07 20:02                                       ` Daniel Phillips
2002-10-07 20:14                                         ` Andrew Morton [this message]
2002-10-07 20:22                                           ` Daniel Phillips
2002-10-07 20:28                                         ` Linus Torvalds
2002-10-07 21:16                                           ` Daniel Phillips
2002-10-07 21:55                                             ` Linus Torvalds
2002-10-07 22:02                                               ` Daniel Phillips
2002-10-07 22:12                                                 ` Andrew Morton
2002-10-08  8:49                                                   ` Padraig Brady
2002-10-07 22:14                                             ` Charles Cazabon
2002-10-30 18:26                                   ` Lee Leahu
2002-10-06  6:33                         ` Martin J. Bligh
2002-10-07  5:28                         ` John Alvord
2002-10-07  8:39                         ` The reason to call it 3.0 is the desktop (was Re: [OT] 2.6 n Giuliano Pochini
2002-10-07 13:56                         ` The reason to call it 3.0 is the desktop (was Re: [OT] 2.6 not 3.0 - (NUMA)) Jesse Pollard
2002-10-07 14:03                           ` Rob Landley
2002-10-08 22:14                             ` Jesse Pollard
2002-10-08 19:11                               ` Rob Landley
2002-10-09  8:17                             ` Alexander Kellett
2002-10-07 18:22                           ` Daniel Phillips
2002-10-08  8:19                             ` Jan Hudec
2002-10-11 23:53                         ` Hans Reiser
2002-10-11 20:26                           ` Rob Landley
2002-10-12  4:14                             ` Nick LeRoy
2002-10-13 17:27                               ` Rob Landley
2002-10-12 10:03                             ` Hans Reiser
2002-10-13 17:32                               ` Rob Landley
2002-10-13 23:51                                 ` Hans Reiser
2002-10-14 16:33                                   ` Rob Landley
2002-10-14  7:10                                 ` Nikita Danilov
2002-10-21 15:36                                   ` [OT] Please don't call it 3.0!! (was Re: The reason to call it 3.0 is the desktop (was Re: [OT] 2.6 not 3.0 - (NUMA))) Calin A. Culianu
2002-10-21 16:20                                     ` Wakko Warner
2002-10-12 11:42                             ` The reason to call it 3.0 is the desktop (was Re: [OT] 2.6 not 3.0 - (NUMA)) Matthias Andree
2002-10-12 14:56                               ` Hugh Dickins
2002-09-27 11:32       ` [PATCH-RFC] 4 of 4 - New problem logging macros, SCSI RAIDdevice driver Alan Cox

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