From: Jeff Garzik <jeff@garzik•org>
To: Theodore Tso <tytso@mit•edu>,
Suparna Bhattacharya <suparna@in•ibm.com>,
Andrew Morton <akpm@osdl•org>, Willy Tarreau <w@1wt•eu>,
Linus Torvalds <torvalds@osdl•org>,
"H. Peter Anvin" <hpa@zytor•com>,
git@vger•kernel.org, nigel@nigel•suspend2.net,
"J.H." <warthog9@kernel•org>,
Randy Dunlap <randy.dunlap@oracle•com>,
Pavel Machek <pavel@ucw•cz>,
kernel list <linux-kernel@vger•kernel.org>,
webmaster@kernel•org,
"linux-ext4@vger•kernel.org" <linux-ext4@vger•kernel.org>
Subject: Re: How git affects kernel.org performance
Date: Mon, 08 Jan 2007 08:43:01 -0500 [thread overview]
Message-ID: <45A24A65.1070706@garzik.org> (raw)
In-Reply-To: <20070108125819.GA32756@thunk.org>
Theodore Tso wrote:
> The fastest and probably most important thing to add is some readahead
> smarts to directories --- both to the htree and non-htree cases. If
> you're using some kind of b-tree structure, such as XFS does for
> directories, preallocation doesn't help you much. Delayed allocation
> can save you if your delayed allocator knows how to structure disk
> blocks so that a btree-traversal is efficient, but I'm guessing the
> biggest reason why we are losing is because we don't have sufficient
> readahead. This also has the advantage that it will help without
> needing to doing a backup/restore to improve layout.
Something I just thought of: ATA and SCSI hard disks do their own
read-ahead. Seeking all over the place to pick up bits of directory
will hurt even more with the disk reading and throwing away data (albeit
in its internal elevator and cache).
Jeff
next prev parent reply other threads:[~2007-01-08 13:43 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 [this message]
2007-01-09 1:09 ` Paul Jackson
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=45A24A65.1070706@garzik.org \
--to=jeff@garzik$(echo .)org \
--cc=akpm@osdl$(echo .)org \
--cc=git@vger$(echo .)kernel.org \
--cc=hpa@zytor$(echo .)com \
--cc=linux-ext4@vger$(echo .)kernel.org \
--cc=linux-kernel@vger$(echo .)kernel.org \
--cc=nigel@nigel$(echo .)suspend2.net \
--cc=pavel@ucw$(echo .)cz \
--cc=randy.dunlap@oracle$(echo .)com \
--cc=suparna@in$(echo .)ibm.com \
--cc=torvalds@osdl$(echo .)org \
--cc=tytso@mit$(echo .)edu \
--cc=w@1wt$(echo .)eu \
--cc=warthog9@kernel$(echo .)org \
--cc=webmaster@kernel$(echo .)org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox