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From: Paul Jackson <pj@sgi.com>
To: Jeff Garzik <jeff@garzik.org>
Cc: tytso@mit.edu, suparna@in.ibm.com, akpm@osdl.org, w@1wt.eu,
	torvalds@osdl.org, hpa@zytor.com, git@vger.kernel.org,
	nigel@nigel.suspend2.net, warthog9@kernel.org,
	randy.dunlap@oracle.com, pavel@ucw.cz,
	linux-kernel@vger.kernel.org, webmaster@kernel.org,
	linux-ext4@vger.kernel.org
Subject: Re: How git affects kernel.org performance
Date: Mon, 8 Jan 2007 17:09:34 -0800	[thread overview]
Message-ID: <20070108170934.dafc5b81.pj@sgi.com> (raw)
In-Reply-To: <45A24A65.1070706@garzik.org>

Jeff wrote:
> Something I just thought of:  ATA and SCSI hard disks do their own
> read-ahead.

Probably this is wishful thinking on my part, but I would have hoped
that most of the read-ahead they did was for stuff that happened to be
on the cylinder they were reading anyway.  So long as their read-ahead
doesn't cause much extra or delayed disk head motion, what does it
matter?

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@sgi.com> 1.925.600.0401

  reply	other threads:[~2007-01-09  1:11 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20061214223718.GA3816@elf.ucw.cz>
     [not found] ` <20061216094421.416a271e.randy.dunlap@oracle.com>
     [not found]   ` <20061216095702.3e6f1d1f.akpm@osdl.org>
     [not found]     ` <458434B0.4090506@oracle.com>
     [not found]       ` <1166297434.26330.34.camel@localhost.localdomain>
     [not found]         ` <1166304080.13548.8.camel@nigel.suspend2.net>
     [not found]           ` <459152B1.9040106@zytor.com>
     [not found]             ` <1168140954.2153.1.camel@nigel.suspend2.net>
2007-01-07  4:22               ` [KORG] Re: kernel.org lies about latest -mm kernel Jeff Garzik
2007-01-07  4:29                 ` Linus Torvalds
2007-01-07 20:11                 ` Greg KH
2007-01-07 21:30                   ` H. Peter Anvin
2007-01-07 21:54                   ` Junio C Hamano
2007-01-07 22:21                     ` Jeff Garzik
2007-01-07 22:53                       ` Linus Torvalds
2007-01-07 23:32                         ` Martin Langhoff
     [not found]               ` <45A08269.4050504@zytor.com>
2007-01-07  5:24                 ` How git affects kernel.org performance H. Peter Anvin
2007-01-07  5:39                   ` Linus Torvalds
2007-01-07  8:55                     ` Willy Tarreau
2007-01-07  8:58                       ` H. Peter Anvin
2007-01-07  9:03                         ` Willy Tarreau
2007-01-07 10:28                           ` Christoph Hellwig
2007-01-07 10:52                             ` Willy Tarreau
2007-01-07 18:17                             ` Linus Torvalds
2007-01-07 19:13                               ` Linus Torvalds
     [not found]                                 ` <9e4733910701071126r7931042eldfb73060792f4f41@mail.gmail.com>
2007-01-07 19:35                                   ` Linus Torvalds
2007-01-07 10:50                           ` Jan Engelhardt
2007-01-07 18:49                             ` Randy Dunlap
2007-01-07 19:07                               ` Jan Engelhardt
2007-01-07 19:28                                 ` Randy Dunlap
2007-01-07 19:37                                   ` Linus Torvalds
2007-01-07  9:15                       ` Andrew Morton
2007-01-07  9:38                         ` Rene Herman
2007-01-08  3:05                         ` Suparna Bhattacharya
2007-01-08 12:58                           ` Theodore Tso
2007-01-08 13:41                             ` Johannes Stezenbach
2007-01-08 13:56                               ` Theodore Tso
2007-01-08 13:59                                 ` Pavel Machek
2007-01-08 14:17                                   ` Theodore Tso
2007-01-08 13:43                             ` Jeff Garzik
2007-01-09  1:09                               ` Paul Jackson [this message]
2007-01-09  2:18                                 ` Jeremy Higdon
     [not found]                             ` <20070109075945.GA8799@mail.ustc.edu.cn>
2007-01-09  7:59                               ` Fengguang Wu
2007-01-09  7:59                               ` Fengguang Wu
2007-01-09 16:23                                 ` Linus Torvalds
     [not found]                                   ` <20070110015739.GA26978@mail.ustc.edu.cn>
2007-01-10  1:57                                     ` Fengguang Wu
2007-01-10  1:57                                     ` Fengguang Wu
2007-01-10  1:57                                     ` Fengguang Wu
2007-01-10  3:20                                     ` Nigel Cunningham
     [not found]                                       ` <20070110140730.GA986@mail.ustc.edu.cn>
2007-01-10 14:07                                         ` Fengguang Wu
2007-01-10 14:07                                         ` Fengguang Wu
2007-01-10 14:07                                         ` Fengguang Wu
2007-01-12 10:54                                         ` Nigel Cunningham
2007-01-09  7:59                               ` Fengguang Wu
2007-01-07 14:57                   ` Robert Fitzsimons
2007-01-07 19:12                     ` J.H.
2007-01-08  1:51                     ` Jakub Narebski
2007-01-07 15:06                   ` Krzysztof Halasa
2007-01-07 20:31                     ` Shawn O. Pearce
2007-01-08 14:46                       ` Nicolas Pitre

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