From: Andrea Arcangeli <andrea@suse.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
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 11:29:52 +0100 [thread overview]
Message-ID: <20020110112952.F3357@inspiron.school.suse.de> (raw)
In-Reply-To: <200201091928.g09JSdH23535@eng2.beaverton.ibm.com> <E16ORfZ-0002Zu-00@the-village.bc.nu>
In-Reply-To: <E16ORfZ-0002Zu-00@the-village.bc.nu>; from alan@lxorguk.ukuu.org.uk on Wed, Jan 09, 2002 at 10:58:05PM +0000
On Wed, Jan 09, 2002 at 10:58:05PM +0000, Alan Cox wrote:
> > If it is not reasonable to fix all the brokern drivers,
> > how about making this configurable (to do variable size IO) ?
> > Do you favour this solution ?
>
> We have hardware that requires aligned power of two for writes (ie 4K on
> 4K boundaries only). The 3ware is one example Jeff Merkey found
of course the right way to do it is to coalesce only if all the
alignments simulates what would happen with a 4k ext2. Now it maybe that
the patch is broken (didn't checked the implementation), but at least
theoretically the merging to save cpu should be doable without breaking
anything and without the need of bio (of course bio can do more than 4k
at once, so it's not nearly as powerful as bio but still it should make a
noticeable difference in the benchmarks).
Andrea
next prev parent reply other threads:[~2002-01-10 10:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-09 17:41 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 [this message]
2002-01-10 10:18 ` Andrea Arcangeli
2002-01-10 10:22 ` Jens Axboe
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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