From: Jens Axboe <axboe@suse.de>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Badari Pulavarty <pbadari@us.ibm.com>,
Benjamin LaHaise <bcrl@redhat.com>,
linux-kernel@vger.kernel.org, marcelo@conectiva.com.br
Subject: Re: [PATCH] PAGE_SIZE IO for RAW (RAW VARY)
Date: Thu, 10 Jan 2002 11:22:25 +0100 [thread overview]
Message-ID: <20020110112225.S19814@suse.de> (raw)
In-Reply-To: <20020109132148.C12609@redhat.com> <200201091928.g09JSdH23535@eng2.beaverton.ibm.com> <20020110111825.C3357@inspiron.school.suse.de>
In-Reply-To: <20020110111825.C3357@inspiron.school.suse.de>
On Thu, Jan 10 2002, Andrea Arcangeli wrote:
> On Wed, Jan 09, 2002 at 11:28:39AM -0800, Badari Pulavarty wrote:
> > Ben,
> >
> > By any chance do you have a list of drivers that assume this ?
> > What does it take to fix them ?
> >
> > I think Jens BIO changes for 2.5 will fix this problem. But
> > 2.4 needs a solution in this area too. This patch showed
> > significant improvement for database workloads.
>
> I didn't checked the implementation but as far as the blkdev is
> concerned the b_size changes without notification as soon as you 'mkfs
> -b somethingelse' and then mount the fs. So it cannot break as far I can
> tell. The only important thing is that b_size stays between 512 and 4k.
The concern is/was differently sized buffer_heads in the same request,
ie b_size changing as you iterate through the chunks of one request.
--
Jens Axboe
next prev parent reply other threads:[~2002-01-10 10:22 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-09 17:41 [PATCH] PAGE_SIZE IO for RAW (RAW VARY) Badari Pulavarty
2002-01-09 17:58 ` Benjamin LaHaise
2002-01-09 18:12 ` Badari Pulavarty
2002-01-09 18:21 ` Benjamin LaHaise
2002-01-09 19:28 ` Badari Pulavarty
2002-01-09 19:49 ` Benjamin LaHaise
2002-01-09 22:58 ` Alan Cox
2002-01-09 23:48 ` Badari Pulavarty
2002-01-10 10:34 ` Andrea Arcangeli
2002-01-10 10:29 ` Andrea Arcangeli
2002-01-10 10:18 ` Andrea Arcangeli
2002-01-10 10:22 ` Jens Axboe [this message]
2002-01-10 10:47 ` Andrea Arcangeli
2002-01-10 10:51 ` Jens Axboe
2002-01-10 11:09 ` Andrea Arcangeli
2002-01-10 16:58 ` Badari Pulavarty
2002-01-11 13:52 ` Andrea Arcangeli
2002-01-10 19:24 ` Badari Pulavarty
2002-01-10 20:00 ` Alan Cox
2002-01-10 21:03 ` Badari Pulavarty
2002-01-10 21:26 ` Alan Cox
2002-01-10 21:15 ` Badari Pulavarty
2002-01-15 3:16 ` Joel Becker
2002-01-10 7:12 ` Jens Axboe
2002-01-09 18:13 ` Jens Axboe
2002-01-09 22:56 ` Alan Cox
2002-01-09 23:20 ` Badari Pulavarty
2002-01-10 0:23 ` Alan Cox
2002-01-10 4:06 ` GOTO Masanori
[not found] <200201091741.g09HfAI17240@eng2.beaverton.ibm.com.suse.lists.linux.kernel>
[not found] ` <20020109125845.B12609@redhat.com.suse.lists.linux.kernel>
2002-01-09 18:15 ` Andi Kleen
[not found] <200201102153.g0ALrl402482@eng2.beaverton.ibm.com>
2002-01-10 22:11 ` Alan Cox
2002-01-10 22:20 ` Badari Pulavarty
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