From: "H. Peter Anvin" <hpa@zytor.com>
To: Denys Vlasenko <vda.linux@googlemail.com>
Cc: david@lang.hm, Arnd Bergmann <arnd@arndb.de>,
Tejun Heo <tj@kernel.org>,
"linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
Daniel Taylor <Daniel.Taylor@wdc.com>,
Jeff Garzik <jeff@garzik.org>, Mark Lord <kernel@teksavvy.com>,
tytso@mit.edu, hirofumi@mail.parknet.co.jp,
Andrew Morton <akpm@linux-foundation.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
irtiger@gmail.com, Matthew Wilcox <matthew@wil.cx>,
aschnell@suse.de, knikanth@suse.de, jdelvare@suse.de
Subject: Re: ATA 4 KiB sector issues.
Date: Mon, 15 Mar 2010 07:47:59 -0700 [thread overview]
Message-ID: <4B9E489F.6040709@zytor.com> (raw)
In-Reply-To: <201003151056.05833.vda.linux@googlemail.com>
On 03/15/2010 02:56 AM, Denys Vlasenko wrote:
> I think Linux already is doing this. The problem is, in many cases
> OS can't possibly do this, short of using a specially designed
> filesystem.
>
> If you untar a Linux kernel source tarball on a seriously
> fragmented ext2 filesystem, there will be a lot of discontiguous
> and/or misaligned writes smaller than 256K.
> Only smart firmware can help in this case.
Yes, but guess what... there is a lot of stupid firmware out there, and
there are lots of RAID arrays, and so on.
"Seriously fragmented" means you have already lost in the first place.
This doesn't change the fact that this is a real issue and that that is
the major reason why aligning to 63*4K is a bad idea.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2010-03-15 14:49 UTC|newest]
Thread overview: 129+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-08 3:48 ATA 4 KiB sector issues Tejun Heo
2010-03-08 5:38 ` Greg Freemyer
2010-03-08 7:00 ` James Bottomley
2010-03-08 7:53 ` H. Peter Anvin
2010-03-08 15:34 ` Martin K. Petersen
2010-03-09 22:36 ` Daniel Taylor
2010-03-09 22:46 ` Greg Freemyer
2010-03-10 0:05 ` Tejun Heo
2010-03-10 0:14 ` Daniel Taylor
2010-03-10 0:26 ` Tejun Heo
2010-03-10 0:36 ` H. Peter Anvin
2010-03-10 5:17 ` H. Peter Anvin
2010-03-10 7:09 ` Gabor Gombas
2010-03-10 0:32 ` H. Peter Anvin
2010-03-10 10:46 ` Johannes Stezenbach
2010-03-10 11:22 ` H. Peter Anvin
2010-03-08 7:56 ` H. Peter Anvin
2010-03-08 15:33 ` Martin K. Petersen
2010-03-08 15:38 ` Martin K. Petersen
2010-03-08 15:41 ` Martin K. Petersen
2010-03-08 18:50 ` H. Peter Anvin
2010-03-08 18:58 ` James Bottomley
2010-03-08 19:11 ` H. Peter Anvin
2010-03-08 20:02 ` Cláudio Martins
2010-03-08 21:07 ` Martin K. Petersen
2010-03-08 20:19 ` Martin K. Petersen
2010-03-08 21:16 ` H. Peter Anvin
2010-03-10 0:34 ` Tejun Heo
2010-03-10 7:53 ` Matthew Wilcox
2010-03-10 13:47 ` Jeff Garzik
2010-03-10 16:19 ` Damian Lukowski
2010-03-11 13:04 ` Theodore Tso
2010-03-11 13:57 ` Nikanth Karthikesan
2010-03-11 14:28 ` Theodore Tso
2010-03-11 14:39 ` James Bottomley
2010-03-11 15:05 ` Nikanth Karthikesan
2010-03-11 15:25 ` tytso
2010-03-11 16:26 ` Gene Heskett
2010-03-11 16:34 ` Greg Freemyer
2010-03-12 1:09 ` Tejun Heo
2010-03-11 14:48 ` Mike Snitzer
2010-03-11 15:00 ` Nikanth Karthikesan
2010-03-11 15:10 ` Tejun Heo
2010-03-11 16:01 ` Mike Snitzer
2010-03-11 18:26 ` Christoph Hellwig
2010-03-11 16:33 ` H. Peter Anvin
2010-03-08 15:18 ` Martin K. Petersen
2010-03-08 18:29 ` H. Peter Anvin
2010-03-08 20:01 ` Martin K. Petersen
2010-03-08 19:34 ` Mike Snitzer
2010-03-09 2:53 ` Tejun Heo
2010-03-09 3:20 ` Martin K. Petersen
2010-03-09 6:53 ` Michael Tokarev
2010-03-09 10:01 ` Karel Zak
2010-03-09 10:16 ` Michael Tokarev
2010-03-09 11:15 ` Dave Chinner
2010-03-09 11:38 ` Michael Tokarev
2010-03-09 12:20 ` Dave Chinner
2010-03-09 11:50 ` Karel Zak
2010-03-09 12:18 ` Karel Zak
2010-03-10 5:06 ` Martin K. Petersen
2010-03-10 20:50 ` Henrique de Moraes Holschuh
2010-03-10 4:57 ` Martin K. Petersen
2010-03-08 19:58 ` Karel Zak
2010-03-09 2:34 ` Tejun Heo
2010-03-09 2:42 ` Jeff Garzik
2010-03-09 2:49 ` Tejun Heo
2010-03-09 2:42 ` Tejun Heo
2010-03-09 3:11 ` Martin K. Petersen
2010-03-09 3:09 ` Martin K. Petersen
2010-03-09 3:38 ` Daniel Taylor
2010-03-09 4:54 ` Martin K. Petersen
2010-03-09 7:27 ` Jim Meyering
2010-03-09 23:56 ` Tejun Heo
2010-03-08 20:12 ` H. Peter Anvin
2010-03-09 2:22 ` Tejun Heo
2010-03-09 2:44 ` Tejun Heo
2010-03-09 3:18 ` Martin K. Petersen
2010-03-09 14:32 ` Mark Lord
2010-03-09 6:34 ` Mikael Abrahamsson
2010-03-09 10:06 ` Michal Soltys
2010-03-10 0:11 ` Tejun Heo
2010-03-14 21:09 ` Michal Soltys
2010-03-14 22:56 ` s ponnusa
2010-03-09 13:55 ` Mark Lord
2010-03-10 0:00 ` Tejun Heo
2010-03-10 6:08 ` Mark Lord
2010-03-09 23:46 ` Arnd Bergmann
2010-03-10 0:20 ` Tejun Heo
2010-03-10 9:14 ` Denys Vlasenko
2010-03-15 1:21 ` H. Peter Anvin
2010-03-15 2:26 ` Denys Vlasenko
2010-03-15 2:56 ` Greg Freemyer
2010-03-15 4:00 ` H. Peter Anvin
2010-03-15 12:30 ` Arnd Bergmann
2010-03-15 5:20 ` david
2010-03-15 9:56 ` Denys Vlasenko
2010-03-15 14:47 ` H. Peter Anvin [this message]
2010-03-16 2:30 ` Tejun Heo
2010-03-16 2:32 ` Tejun Heo
2010-03-16 6:14 ` James Bottomley
2010-03-16 6:22 ` Tejun Heo
2010-03-16 13:24 ` James Bottomley
2010-03-16 13:56 ` Tejun Heo
2010-03-16 14:21 ` James Bottomley
2010-03-16 14:25 ` Arnd Bergmann
2010-03-16 14:50 ` Tejun Heo
2010-03-16 15:02 ` James Bottomley
2010-03-16 15:20 ` Tejun Heo
2010-03-16 15:22 ` Martin K. Petersen
2010-03-17 2:07 ` Tejun Heo
2010-03-16 15:23 ` James Bottomley
2010-03-16 15:37 ` Tejun Heo
2010-03-16 20:42 ` Ric Wheeler
2010-03-17 2:04 ` Tejun Heo
2010-03-17 2:51 ` Kevin Easton
2010-03-17 3:44 ` Tejun Heo
2010-03-17 8:01 ` jdow
2010-03-17 17:04 ` Bill Davidsen
2010-03-16 14:38 ` Denys Vlasenko
2010-03-16 15:12 ` Tejun Heo
2010-03-16 15:25 ` Denys Vlasenko
2010-03-16 15:47 ` Tejun Heo
2010-03-17 6:48 ` H. Peter Anvin
2010-03-16 6:27 ` Thomas Chou
-- strict thread matches above, loose matches on Subject: below --
2010-03-12 3:10 H. Peter Anvin
2010-03-16 22:21 H. Peter Anvin
2010-03-17 15:08 ` Ric Wheeler
2010-03-17 17:13 ` H. Peter Anvin
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