From: Kurt Garloff <garloff@suse.de>
To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [RESEND] [PATCH] readahead:add blk_run_backing_dev
Date: Wed, 15 Jul 2009 22:52:20 +0200 [thread overview]
Message-ID: <20090715205220.GL31657@tpkurt2.suse.de> (raw)
In-Reply-To: <4A5493A8.2000806@vlnb.net>
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Hi,
On Wed, Jul 08, 2009 at 04:40:08PM +0400, Vladislav Bolkhovitin wrote:
> I've also long ago noticed that reading data from block devices is slower
> than from files from mounted on those block devices file systems. Can
> anybody explain it?
Brainstorming:
- block size (reads on the block dev might be done with smaller size)
- readahead (do we use the same RA algo for block devs)
- page cache might be better optimized than buffer cache?
Just guesses from someone that has not looked into that area of the
kernel for a while, so take it with a grain of salt.
Cheers,
--
Kurt Garloff, VP OPS Partner Engineering -- Novell Inc.
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next prev parent reply other threads:[~2009-07-15 20:51 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-29 5:35 [RESEND] [PATCH] readahead:add blk_run_backing_dev Hisashi Hifumi
2009-06-01 0:36 ` Andrew Morton
2009-06-01 1:04 ` Hisashi Hifumi
2009-06-05 15:15 ` Alan D. Brunelle
2009-06-06 14:36 ` KOSAKI Motohiro
2009-06-06 22:45 ` Wu Fengguang
2009-06-18 19:04 ` Andrew Morton
2009-06-20 3:55 ` Wu Fengguang
2009-06-20 12:29 ` Vladislav Bolkhovitin
2009-06-29 9:34 ` Wu Fengguang
2009-06-29 10:26 ` Ronald Moesbergen
2009-06-29 10:26 ` Ronald Moesbergen
2009-06-29 10:55 ` Vladislav Bolkhovitin
2009-06-29 12:54 ` Wu Fengguang
2009-06-29 12:58 ` Bart Van Assche
2009-06-29 13:01 ` Wu Fengguang
2009-06-29 13:04 ` Vladislav Bolkhovitin
2009-06-29 13:13 ` Wu Fengguang
2009-06-29 13:28 ` Wu Fengguang
2009-06-29 14:43 ` Ronald Moesbergen
2009-06-29 14:51 ` Wu Fengguang
2009-06-29 14:56 ` Ronald Moesbergen
2009-06-29 15:37 ` Vladislav Bolkhovitin
2009-06-29 14:00 ` Ronald Moesbergen
2009-06-29 14:21 ` Wu Fengguang
2009-06-29 15:01 ` Wu Fengguang
2009-06-29 15:37 ` Vladislav Bolkhovitin
[not found] ` <20090630010414.GB31418@localhost>
2009-06-30 10:54 ` Vladislav Bolkhovitin
2009-07-01 13:07 ` Ronald Moesbergen
2009-07-01 18:12 ` Vladislav Bolkhovitin
2009-07-03 9:14 ` Ronald Moesbergen
2009-07-03 10:56 ` Vladislav Bolkhovitin
2009-07-03 12:41 ` Ronald Moesbergen
2009-07-03 12:46 ` Vladislav Bolkhovitin
2009-07-04 15:19 ` Ronald Moesbergen
2009-07-06 11:12 ` Vladislav Bolkhovitin
2009-07-06 14:37 ` Ronald Moesbergen
2009-07-06 14:37 ` Ronald Moesbergen
2009-07-06 17:48 ` Vladislav Bolkhovitin
2009-07-07 6:49 ` Ronald Moesbergen
2009-07-07 6:49 ` Ronald Moesbergen
[not found] ` <4A5395FD.2040507@vlnb.net>
[not found] ` <a0272b440907080149j3eeeb9bat13f942520db059a8@mail.gmail.com>
2009-07-08 12:40 ` Vladislav Bolkhovitin
2009-07-10 6:32 ` Ronald Moesbergen
2009-07-10 8:43 ` Vladislav Bolkhovitin
2009-07-10 9:27 ` Vladislav Bolkhovitin
2009-07-13 12:12 ` Ronald Moesbergen
2009-07-13 12:36 ` Wu Fengguang
2009-07-13 12:47 ` Ronald Moesbergen
2009-07-13 12:52 ` Wu Fengguang
2009-07-14 18:52 ` Vladislav Bolkhovitin
2009-07-15 7:06 ` Wu Fengguang
2009-07-14 18:52 ` Vladislav Bolkhovitin
2009-07-15 6:30 ` Vladislav Bolkhovitin
2009-07-16 7:32 ` Ronald Moesbergen
2009-07-16 10:36 ` Vladislav Bolkhovitin
2009-07-16 14:54 ` Ronald Moesbergen
2009-07-16 16:03 ` Vladislav Bolkhovitin
2009-07-17 14:15 ` Ronald Moesbergen
2009-07-17 18:23 ` Vladislav Bolkhovitin
2009-07-20 7:20 ` Vladislav Bolkhovitin
2009-07-22 8:44 ` Ronald Moesbergen
2009-07-27 13:11 ` Vladislav Bolkhovitin
2009-07-28 9:51 ` Ronald Moesbergen
2009-07-28 19:07 ` Vladislav Bolkhovitin
2009-07-29 12:48 ` Ronald Moesbergen
2009-07-31 18:32 ` Vladislav Bolkhovitin
2009-08-03 9:15 ` Ronald Moesbergen
2009-08-03 9:20 ` Vladislav Bolkhovitin
2009-08-03 11:44 ` Ronald Moesbergen
2009-08-03 11:44 ` Ronald Moesbergen
2009-07-15 20:52 ` Kurt Garloff [this message]
2009-07-16 10:38 ` Vladislav Bolkhovitin
2009-06-30 10:22 ` Vladislav Bolkhovitin
2009-06-29 10:55 ` Vladislav Bolkhovitin
2009-06-29 13:00 ` Wu Fengguang
2009-09-22 20:58 ` Andrew Morton
2009-09-22 20:58 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2009-09-23 1:48 Wu Fengguang
2009-09-23 1:48 ` [RESEND] [PATCH] readahead:add blk_run_backing_dev Wu Fengguang
2009-09-23 1:48 ` (unknown) Wu Fengguang
2009-05-22 0:09 [RESEND][PATCH] readahead:add blk_run_backing_dev Hisashi Hifumi
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