From: Chris Wedgwood <cw@f00f.org>
To: Andrew Morton <akpm@zip.com.au>
Cc: Steve Bergman <steve@rueb.com>, linux-kernel@vger.kernel.org
Subject: Re: Disk hardware caching, performance, and journalling
Date: Sun, 25 Nov 2001 22:22:14 +1300 [thread overview]
Message-ID: <20011125222214.C9672@weta.f00f.org> (raw)
In-Reply-To: <3BFFE8A2.1010708@rueb.com> <3BFFF021.D963B467@zip.com.au>
In-Reply-To: <3BFFF021.D963B467@zip.com.au>
On Sat, Nov 24, 2001 at 11:08:17AM -0800, Andrew Morton wrote:
In theory, yes. In my opinion, no. For ext3, at least. Caching
isn't bad per-se. It's reordering which can break the journalling
constraints.
Some disks[1] most definately do reorder; I've actually been able to
demonstrate this in some circumstances (it wasn't trivial to
produce and required several attempts).
--cw
[1] SCSI, which we know does and will reorder writes when a barrier
isn't specificed, it appears IDE drives can do the same but lack of
hot-swap makes testing tedious :)
next prev parent reply other threads:[~2001-11-25 9:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-24 18:36 Disk hardware caching, performance, and journalling Steve Bergman
2001-11-24 19:08 ` Andrew Morton
2001-11-24 19:39 ` Florian Weimer
2001-11-24 21:57 ` Phil Howard
2001-11-25 9:22 ` Chris Wedgwood [this message]
2001-11-24 19:39 ` Mark Hahn
2001-11-25 9:23 ` Chris Wedgwood
2001-11-25 21:45 ` Kevin P. Fleming
2001-11-25 22:11 ` Chris Wedgwood
2001-11-25 22:29 ` Mark Hahn
2001-11-26 1:10 ` Bernd Eckenfels
2001-11-25 9:19 ` Chris Wedgwood
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