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

From: Peter Zijlstra
Date: Wed Sep 02 2009 - 03:35:37 EST

> On Tue, 2009-09-01 at 16:27 -0400, Theodore Tso wrote:

> > So perhaps the best argument for not making this be a tunable is that
> > in the long run, we will need to put in a better algorithm for
> > controlling how much writeback we want to do before we start
> > saturating RAID arrays, and in that new algorithm this tunable may no
> > longer make sense. Fine; at that point, we can make it go away. For
> > now, though, it seems to be the best way to tweak what is going on,
> > since I doubt we'll be able to come up with one magic number that will
> > satisfy everyone.

Also, what is the incentive to actually improve the situation once we
merge this? People will say, turn the knob and don't bother us.
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