From: Jens Axboe <axboe@suse.de>
To: Joel Becker <jlbec@evilplan.org>, Andrew Morton <akpm@osdl.org>,
Badari Pulavarty <pbadari@us.ibm.com>,
suparna@in.ibm.com, linux-kernel@vger.kernel.org,
linux-aio@kvack.org
Subject: Re: [PATCH][2.6-mm] Readahead issues and AIO read speedup
Date: Fri, 8 Aug 2003 07:42:39 +0200 [thread overview]
Message-ID: <20030808054239.GB2886@suse.de> (raw)
In-Reply-To: <20030807193641.GM3164@parcelfarce.linux.theplanet.co.uk>
On Thu, Aug 07 2003, Joel Becker wrote:
> On Thu, Aug 07, 2003 at 09:28:00AM -0700, Andrew Morton wrote:
> > If the database pagesize is 16k then the application should be submitting
> > 16k reads, yes? If so then these should not be creating 4k requests at the
> > device layer! So what we need to do is to ensure that at least those 16k
>
> Um, I thought bio enforced single CDB I/O for contiguous chunks
> of disk! If it doesn't, 2.6 is just as lame as 2.4.
It does of course, that was one of the main points of the bio structure.
->readpages() can submit those 16k minimum chunks in one bio.
--
Jens Axboe
prev parent reply other threads:[~2003-08-08 5:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-07 10:01 [PATCH][2.6-mm] Readahead issues and AIO read speedup Suparna Bhattacharya
2003-08-07 16:01 ` Badari Pulavarty
2003-08-07 16:28 ` Andrew Morton
2003-08-07 17:21 ` Badari Pulavarty
2003-08-07 17:39 ` Andrew Morton
2003-08-07 20:41 ` Badari Pulavarty
2003-08-07 20:58 ` Andrew Morton
2003-08-08 13:56 ` Suparna Bhattacharya
2003-08-13 21:06 ` Ram Pai
2003-09-23 0:41 ` Ram Pai
2003-08-07 19:36 ` Joel Becker
2003-08-08 5:42 ` Jens Axboe [this message]
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=20030808054239.GB2886@suse.de \
--to=axboe@suse.de \
--cc=akpm@osdl.org \
--cc=jlbec@evilplan.org \
--cc=linux-aio@kvack.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pbadari@us.ibm.com \
--cc=suparna@in.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.