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Message-ID: <20071122120611.GA3573@one.firstfloor.org>
Date: Thu, 22 Nov 2007 13:06:11 +0100
From: Andi Kleen <andi@...stfloor.org>
To: Stewart Smith <stewart@...ql.com>
Cc: David Chinner <dgc@....com>, Andi Kleen <andi@...stfloor.org>,
xfs-oss <xfs@....sgi.com>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/9]: Reduce Log I/O latency
> FWIW from a "real time" database POV this seems to make sense to me...
> in fact, we probably rely on filesystem metadata way too much
> (historically it's just "worked".... although we do seem to get issues
> on ext3).
For that case you really would need priority inheritance: any metadata
IO on behalf or blocking a process needs to use the process' block IO
priority.
David's change just fixes a limited set of cases, but breaks others.
-Andi
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