From: Tejun Heo <htejun@gmail.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: 7eggert@gmx.de, Chuck Ebbert <cebbert@redhat.com>,
emisca <emisca.ml@gmail.com>,
Jan Engelhardt <jengelh@linux01.gwdg.de>,
Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-ide@vger.kernel.org, Adrian Bunk <bunk@stusta.de>,
Andrew Morton <akpm@osdl.org>
Subject: Re: Loud "pop" coming from hard drive on reboot
Date: Wed, 18 Apr 2007 21:46:47 +0900 [thread overview]
Message-ID: <46261337.3010406@gmail.com> (raw)
In-Reply-To: <20070418132904.3322ba5f@the-village.bc.nu>
Alan Cox wrote:
>> Not that simple. Most disks don't spin up on SYNCHRONIZE_CACHE if its
>> cache is clean. Sadly some disks actually spin up when it receives spin
>> down command while spun down to immediately spin down again, so we would
>> be fixing problem for some number of disks while breaking others. :-(
>
> Snoop the last command sent to the drive, that tells you if you can skip
> the cache flush ?
Thought about that and querying power state before doing shutdown
sequence but things get somewhat ugly because shutdown sequence is
driven from sd->shutdown(). We'll have to snoop both sync and shutdown
commands and check whether the system is shutting down. Also, I felt
very uneasy about faking successful completion to SYNCHRONIZE_CACHE.
I dunno. It's already too late for 2.6.21. I was hoping we could get
distros to update shutdown utilities in not-too-distant future but I
have no experience with that. Is that just a wishful thinking?
--
tejun
next prev parent reply other threads:[~2007-04-18 12:46 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <88SeR-5Sf-15@gated-at.bofh.it>
[not found] ` <88Sov-662-3@gated-at.bofh.it>
[not found] ` <88SHV-6uL-29@gated-at.bofh.it>
[not found] ` <8agVk-3wc-81@gated-at.bofh.it>
[not found] ` <8b3IR-4mE-25@gated-at.bofh.it>
[not found] ` <8b3SA-4z3-5@gated-at.bofh.it>
[not found] ` <8b42g-51N-15@gated-at.bofh.it>
[not found] ` <8bbdm-7iS-27@gated-at.bofh.it>
2007-04-18 11:47 ` Loud "pop" coming from hard drive on reboot Bodo Eggert
2007-04-18 12:05 ` Tejun Heo
2007-04-18 12:29 ` Alan Cox
2007-04-18 12:46 ` Tejun Heo [this message]
2007-04-18 12:50 ` Tejun Heo
2007-04-18 13:03 ` Alan Cox
2007-04-18 13:05 ` Tejun Heo
2007-04-18 13:39 ` Stephen Clark
2007-04-19 7:18 ` Jan Engelhardt
2007-04-19 12:59 ` Stephen Clark
2007-04-19 13:32 ` Mark Lord
2007-04-18 14:32 ` Mark Lord
2007-04-18 14:35 ` Mark Lord
2007-04-18 15:06 ` Alan Cox
2007-04-18 15:16 ` Mark Lord
2007-04-18 15:25 ` Tejun Heo
2007-04-18 17:08 ` Mark Lord
2007-04-18 17:19 ` Mark Lord
2007-04-18 17:46 ` Chuck Ebbert
2007-04-18 21:22 ` Bartlomiej Zolnierkiewicz
2007-04-18 21:27 ` Chuck Ebbert
2007-04-21 23:20 ` Peter Zijlstra
2007-04-23 23:27 ` Chuck Ebbert
2007-04-18 21:29 ` Greg Freemyer
2007-04-18 17:46 ` Stephen Clark
2007-04-19 17:50 ` Chuck Ebbert
2007-04-20 12:15 ` Stephen Clark
2007-04-20 19:57 ` Fabio Comolli
2007-04-21 9:45 ` emisca
2007-04-21 9:50 ` Fabio Comolli
2007-04-21 14:33 ` Jan Engelhardt
2007-04-21 15:11 ` Fabio Comolli
2007-04-18 17:04 ` Stephen Clark
[not found] <fa.C4axrtm0R4NUqTWfuNUHmUuWy3s@ifi.uio.no>
[not found] ` <fa.VWJWPLq+/tQvH9AK4UjcjZqbJe4@ifi.uio.no>
[not found] ` <fa.EnoRw2EXyWNvVcFxHrcbfZBCcsg@ifi.uio.no>
[not found] ` <fa.M3hXdZRYWoxu+2mG+LfZsZs6AKA@ifi.uio.no>
[not found] ` <fa.9O8bUjY5F4TzNzCQp6dHXDtOIR0@ifi.uio.no>
[not found] ` <fa.kwrK207qOU0rARQuJJKqsJ7Nk4w@ifi.uio.no>
2007-04-18 22:58 ` Robert Hancock
[not found] <fa.XZdGeaFaW9WSFIAsz5f9RETfH0c@ifi.uio.no>
[not found] ` <fa.8Q2FxIVtQ1sfsfDBeXACAS7rK6Y@ifi.uio.no>
2007-04-18 22:57 ` Robert Hancock
[not found] <fa.nTNVZ3bPe8773+gVV7CvcwBT5zY@ifi.uio.no>
2007-04-13 23:21 ` Robert Hancock
[not found] ` <fa.r8VLu18GDND9EByYV/EX2mH9V88@ifi.uio.no>
[not found] ` <fa.30Zxf5IYhdVc+I5v0caKmHH3HmE@ifi.uio.no>
[not found] ` <fa.EFm9zBLufsOlxdviaZmnBDcbYgY@ifi.uio.no>
[not found] ` <fa.TBFIUvjBaGbwUHy5JUiGJpvOeMI@ifi.uio.no>
[not found] ` <fa.jDn5j5GVDwXXnVYH74vVT3m+Gq8@ifi.uio.no>
2007-04-18 23:00 ` Robert Hancock
2007-04-18 23:25 ` Chuck Ebbert
2007-04-19 13:30 ` emisca
2007-04-11 21:07 Chuck Ebbert
2007-04-11 21:16 ` Jan Engelhardt
2007-04-11 21:35 ` Chuck Ebbert
2007-04-11 21:49 ` Jan Engelhardt
2007-04-11 22:07 ` Chuck Ebbert
2007-04-13 19:42 ` Bartlomiej Zolnierkiewicz
2007-04-13 19:36 ` Chuck Ebbert
2007-04-13 20:47 ` Bartlomiej Zolnierkiewicz
2007-04-13 21:13 ` Chuck Ebbert
2007-04-15 16:07 ` emisca
2007-04-15 19:06 ` auxsvr
2007-04-17 21:41 ` Mark Lord
2007-04-17 21:49 ` Chuck Ebbert
2007-04-17 22:03 ` Mark Lord
2007-04-18 5:39 ` Tejun Heo
2007-04-18 21:31 ` Bartlomiej Zolnierkiewicz
2007-04-18 23:36 ` Mark Lord
2007-04-18 23:51 ` Mark Lord
2007-04-14 10:52 ` Pavel Machek
2007-04-15 15:53 ` Henrique de Moraes Holschuh
2007-04-15 18:50 ` Jan Engelhardt
2007-04-16 22:26 ` Chuck Ebbert
2007-04-17 7:00 ` emisca
2007-04-17 7:00 ` emisca
2007-04-17 7:37 ` Fabio Comolli
2007-04-17 20:15 ` Henrique de Moraes Holschuh
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