From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Tejun Heo <htejun@gmail.com>
Cc: Karel Zak <kzak@redhat.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
"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, "H. Peter Anvin" <hpa@zytor.com>,
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,
Jim Meyering <jim@meyering.net>
Subject: Re: ATA 4 KiB sector issues.
Date: Mon, 08 Mar 2010 22:11:32 -0500 [thread overview]
Message-ID: <yq1iq9689zv.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <4B95B5AC.8050101@gmail.com> (Tejun Heo's message of "Tue, 09 Mar 2010 11:42:52 +0900")
>>>>> "Tejun" == Tejun Heo <htejun@gmail.com> writes:
>> This will result in incorrect alignment for drives which lie about
>> the physical sector size to work around BIOS/drivers issues (C-1).
>> It would probably be best to align to at least 1MiB.
Tejun> I misread it. C-1 would be disks w/o alignment information which
Tejun> will be aligned to optimal_io_size which again would be 0 and
Tejun> thus 1MiB alignment. So, this should work, right?
Correct. ATA only provides physical block size whereas SCSI has the
extra knobs in the block limits VPD. And consequently ATA block devices
have min_io = physical block size and optimal_io = 0.
So we'll align to 1 MB by default.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2010-03-09 3:13 UTC|newest]
Thread overview: 129+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-08 3:48 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 [this message]
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
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
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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