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From: Pavel Machek <pavel@ucw.cz>
To: Daniel Phillips <phillips@google.com>
Cc: David Chinner <dgc@sgi.com>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Theodore Tso <tytso@mit.edu>, Al Boldi <a1426z@gawab.com>,
	Valerie Henson <val.henson@gmail.com>,
	Rik van Riel <riel@redhat.com>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck)
Date: Wed, 16 Jan 2008 12:51:44 +0100	[thread overview]
Message-ID: <20080116115144.GE22460@elf.ucw.cz> (raw)
In-Reply-To: <4d47a5d10801151544k3bc50223ob69c25d8732e3f12@mail.gmail.com>

On Tue 2008-01-15 18:44:26, Daniel Phillips wrote:
> On Jan 15, 2008 6:07 PM, Pavel Machek <pavel@ucw.cz> wrote:
> > I had write cache enabled on my main computer. Oops. I guess that
> > means we do need better documentation.
> 
> Writeback cache on disk in iteself is not bad, it only gets bad if the
> disk is not engineered to save all its dirty cache on power loss,
> using the disk motor as a generator or alternatively a small battery.
> It would be awfully nice to know which brands fail here, if any,
> because writeback cache is a big performance booster.

Is it?

I guess I should try to measure it. (Linux already does writeback
caching, with 2GB of memory. I wonder how important disks's 2MB of
cache can be).
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  parent reply	other threads:[~2008-01-16 11:51 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-08 21:22 [RFD] Incremental fsck Al Boldi
2008-01-08 21:31 ` Alan
2008-01-09  9:16   ` Andreas Dilger
2008-01-12 23:55     ` Daniel Phillips
2008-01-08 21:41 ` Rik van Riel
2008-01-09  4:40   ` Al Boldi
2008-01-09  7:45     ` Valerie Henson
2008-01-09 11:52       ` Al Boldi
2008-01-09 14:44         ` Rik van Riel
2008-01-10 13:26           ` Al Boldi
2008-01-12 14:51         ` Theodore Tso
2008-01-13 11:05           ` Al Boldi
2008-01-13 17:19           ` Pavel Machek
2008-01-13 17:41             ` Alan Cox
2008-01-15 20:16               ` [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck) Pavel Machek
2008-01-15 21:43                 ` David Chinner
2008-01-15 23:07                   ` Pavel Machek
2008-01-15 23:44                     ` Daniel Phillips
2008-01-16  0:15                       ` Alan Cox
2008-01-16  1:24                         ` Daniel Phillips
2008-01-16  1:36                           ` Chris Mason
2008-01-17 20:54                             ` Pavel Machek
2008-01-16 19:06                           ` Bryan Henderson
2008-01-16 20:05                             ` Alan Cox
2008-01-17  2:02                             ` Daniel Phillips
2008-01-17 21:37                               ` Bryan Henderson
2008-01-17 22:45                               ` Theodore Tso
2008-01-17 22:58                                 ` Alan Cox
2008-01-17 23:18                                 ` Ric Wheeler
2008-01-18  0:31                                   ` Bryan Henderson
2008-01-18 14:23                                     ` Theodore Tso
2008-01-18 15:16                                       ` [Patch] document ext3 requirements (was Re: [RFD] Incrementalfsck) linux-os (Dick Johnson)
2008-01-19 14:53                                         ` Pavel Machek
2008-01-18 15:26                                       ` [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck) Ric Wheeler
2008-01-18 20:34                                         ` Jeff Garzik
2008-01-18 22:35                                           ` Bryan Henderson
2008-01-18 15:08                                     ` H. Peter Anvin
2008-01-18 17:43                                       ` Bryan Henderson
2008-01-16 21:28                         ` Eric Sandeen
2008-01-16 11:51                       ` Pavel Machek [this message]
2008-01-16 12:20                         ` Valdis.Kletnieks
2008-01-19 14:51                           ` Pavel Machek
2008-01-16 16:38                   ` Christoph Hellwig
2008-01-16  1:44                 ` Daniel Phillips
2008-01-16  3:05                   ` Rik van Riel
2008-01-17  7:38                     ` Andreas Dilger
2008-01-16 11:49                   ` Pavel Machek
2008-01-16 20:52                     ` Valerie Henson
2008-01-17 12:29                   ` Szabolcs Szakacsits
2008-01-17 22:51                     ` Daniel Phillips
2008-01-15  1:04             ` [RFD] Incremental fsck Ric Wheeler
2008-01-14  0:22           ` Daniel Phillips
2008-01-09  8:04     ` Valdis.Kletnieks

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