From: Andrew Morton <akpm@osdl.org>
To: Mingming Cao <cmm@us.ibm.com>
Cc: ray-lk@madrabbit.org, sct@redhat.com, pbadari@us.ibm.com,
linux-kernel@vger.kernel.org, ext2-devel@lists.sourceforge.net
Subject: Re: [Ext2-devel] Re: [PATCH 2/3] ext3 reservation allow turn off for specifed file
Date: Tue, 26 Oct 2004 13:18:42 -0700 [thread overview]
Message-ID: <20041026131842.45b99834.akpm@osdl.org> (raw)
In-Reply-To: <1098809607.8919.7466.camel@w-ming2.beaverton.ibm.com>
Mingming Cao <cmm@us.ibm.com> wrote:
>
> > I wonder how important this optimisation really is? I bet no applications
> > are using posix_fadvise(POSIX_FADV_RANDOM) anyway.
> >
> I don't know if there is application using the POSIX_FADV_RANDOM. No? If
> this is the truth, I think we don't need this optimization at present.
> Logically reservation does not benefit seeky random write, but there is
> no benchmark showing performance issue so far. We have already provided
> ways for applications turn off reservation through the existing ioctl
> for specified file and -o noreservation mount option for the whole
> filesystem.
Well we definitely don't want to be encouraging application developers to be
adding ext3-specific ioctls. So we need to work out if any applications
can get significant benefit from manually disabling reservations and if
so, wire up fadvise() into filesystems and do it that way.
Do you know if disabling reservations helps any workloads?
next prev parent reply other threads:[~2004-10-26 20:24 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-15 13:27 Ext3 -mm reservations code: is this fix really correct? Stephen C. Tweedie
2004-10-15 16:01 ` [Ext2-devel] " mingming cao
2004-10-15 16:40 ` Stephen C. Tweedie
2004-10-15 20:29 ` mingming cao
2004-10-15 22:20 ` Stephen C. Tweedie
2004-10-15 22:34 ` mingming cao
2004-10-18 22:55 ` [PATCH 2/3] ext3 reservation allow turn off for specifed file Mingming Cao
2004-10-18 23:42 ` Andrew Morton
2004-10-19 1:01 ` Mingming Cao
2004-10-20 17:55 ` Ray Lee
2004-10-25 20:33 ` [Ext2-devel] " Mingming Cao
2004-10-25 23:05 ` Mingming Cao
2004-10-25 23:45 ` Andrew Morton
2004-10-26 16:53 ` Mingming Cao
2004-10-26 20:18 ` Andrew Morton [this message]
2004-10-26 23:01 ` Mingming Cao
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