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]
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