Re: [PATCH 8/8] vm: Add an tuning knob for vm.max_writeback_pages

[Christoph Hellwig]

On Tue, Sep 01, 2009 at 08:38:55PM +0200, Peter Zijlstra wrote:
> Do we really need a tunable for this?

It will make increasing it in the field a lot easier.  And having deal
with really large systems I have the fear that there are I/O topologies
outhere for which every "reasonable" value is too low.

> I guess we need a limit to avoid it writing out everything, but can't we
> have something automagic?

Some automatic adjustment would be nice.  But finding the right auto
tuning will be an interesting exercise.

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