linux-kernel - Re: [PATCH 2/9]: Reduce Log I/O latency

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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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