From: Dave Jones <davej@redhat.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Wu Fengguang <wfg@mail.ustc.edu.cn>,
linux-kernel@vger.kernel.org, Linus Torvalds <torvalds@osdl.org>,
Andrew Morton <akpm@osdl.org>, Jens Axboe <axboe@suse.de>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Badari Pulavarty <pbadari@us.ibm.com>
Subject: Re: [RFC] kernel facilities for cache prefetching
Date: Tue, 2 May 2006 18:03:37 -0400 [thread overview]
Message-ID: <20060502220337.GB15286@redhat.com> (raw)
In-Reply-To: <1146558617.32045.23.camel@laptopd505.fenrus.org>
On Tue, May 02, 2006 at 10:30:17AM +0200, Arjan van de Ven wrote:
> one interesting thing that came out of the fedora readahead work is that
> most of the bootup isn't actually IO bound.
Here's another interesting datapoint.
A huge proportion of I/O done during bootup is _completely_ unnecessary.
Profiling just a few of the places that seemed to stall yielded some
lovely things, like cupsd reading in and parsing descriptions for
every printer ever known to man, even if there's no printer connected.
Or my favorite.. hald reloading and reparsing the same XML hardware description
files.. ~50 times, _each_.
Utterly insane.
(And these aren't Fedora specific problems btw, every distro shipping those
bits will have the same dumb behaviour [modulo versions])
Dave
--
http://www.codemonkey.org.uk
next prev parent reply other threads:[~2006-05-02 22:04 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-02 7:50 [RFC] kernel facilities for cache prefetching Wu Fengguang
2006-05-02 7:50 ` Wu Fengguang
2006-05-02 12:46 ` Diego Calleja
2006-05-02 14:42 ` Wu Fengguang
2006-05-02 14:42 ` Wu Fengguang
2006-05-02 16:07 ` Diego Calleja
2006-05-03 6:45 ` Wu Fengguang
2006-05-03 6:45 ` Wu Fengguang
2006-05-03 18:14 ` Diego Calleja
2006-05-03 23:39 ` Zan Lynx
2006-05-04 1:37 ` Diego Calleja
2006-05-02 15:55 ` Linus Torvalds
2006-05-02 16:35 ` Andi Kleen
2006-05-03 4:11 ` Wu Fengguang
2006-05-03 4:11 ` Wu Fengguang
2006-05-03 17:28 ` Badari Pulavarty
[not found] ` <346733486.30800@ustc.edu.cn>
2006-05-04 15:03 ` Linus Torvalds
2006-05-04 16:57 ` Badari Pulavarty
2006-05-05 14:44 ` Wu Fengguang
2006-05-05 14:44 ` Wu Fengguang
2006-05-03 7:13 ` Wu Fengguang
2006-05-03 7:13 ` Wu Fengguang
2006-05-03 12:59 ` Nikita Danilov
2006-05-03 22:20 ` Rik van Riel
2006-05-06 1:11 ` Wu Fengguang
2006-05-06 1:11 ` Wu Fengguang
2006-05-04 0:28 ` Linda Walsh
2006-05-04 1:31 ` Linus Torvalds
2006-05-04 7:08 ` Ph. Marek
2006-05-04 7:33 ` Arjan van de Ven
2006-05-04 12:14 ` Wu Fengguang
2006-05-04 12:14 ` Wu Fengguang
2006-05-04 12:34 ` Arjan van de Ven
2006-05-03 21:45 ` Linda Walsh
2006-05-04 12:12 ` Wu Fengguang
2006-05-04 12:12 ` Wu Fengguang
2006-05-04 18:57 ` Linda Walsh
2006-05-05 15:20 ` Wu Fengguang
2006-05-05 15:20 ` Wu Fengguang
2006-05-04 9:02 ` Helge Hafting
2006-05-02 7:58 ` Arjan van de Ven
2006-05-02 8:06 ` Wu Fengguang
2006-05-02 8:06 ` Wu Fengguang
2006-05-02 8:30 ` Arjan van de Ven
2006-05-02 8:53 ` Wu Fengguang
2006-05-02 8:53 ` Wu Fengguang
2006-05-06 6:49 ` Denis Vlasenko
2006-05-02 8:55 ` Arjan van de Ven
2006-05-02 11:39 ` Jan Engelhardt
2006-05-02 11:48 ` Wu Fengguang
2006-05-02 11:48 ` Wu Fengguang
2006-05-02 22:03 ` Dave Jones [this message]
2006-05-02 8:09 ` Jens Axboe
2006-05-02 8:20 ` Wu Fengguang
2006-05-02 8:20 ` Wu Fengguang
2006-05-03 22:05 ` Benjamin LaHaise
2006-05-02 19:10 ` Pavel Machek
2006-05-02 23:36 ` Nigel Cunningham
2006-05-03 2:35 ` Wu Fengguang
2006-05-03 2:35 ` Wu Fengguang
2006-05-03 2:32 ` Wu Fengguang
2006-05-03 2:32 ` Wu Fengguang
2006-05-03 7:19 ` Wu Fengguang
2006-05-03 7:19 ` Wu Fengguang
2006-05-04 12:28 ` Wu Fengguang
2006-05-04 12:28 ` Wu Fengguang
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