From: Wu Fengguang <wfg@mail.ustc.edu.cn>
To: Rik van Riel <riel@redhat.com>
Cc: Linus Torvalds <torvalds@osdl.org>,
linux-kernel@vger.kernel.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: Sat, 6 May 2006 09:11:25 +0800 [thread overview]
Message-ID: <346877876.18033@ustc.edu.cn> (raw)
Message-ID: <20060506011125.GA9099@mail.ustc.edu.cn> (raw)
In-Reply-To: <Pine.LNX.4.64.0605031816480.13777@cuia.boston.redhat.com>
On Wed, May 03, 2006 at 06:20:29PM -0400, Rik van Riel wrote:
> Why not simply read everything in a whole file at a time
> at boot time, while we still have enough free memory ?
Sure it helps, though may be unnecessary once we can rely on userspace
pre-caching tools to do it in a more accurate and efficient way.
The main concern would be inter-file/inter-buffer readahead.
I have some data to support it:
% wc -l hda* startup.files
1743 hda2_buffers <== my /
335 hda3_buffers <== my /home
1130 startup.files
3208 total
The above cache sizes sum up to ~110MB, so it's about 36KB per seek.
Thanks,
Wu
next prev parent reply other threads:[~2006-05-06 1:11 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 [this message]
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
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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