Re: [PATCH] mm: Implement swap prefetching tweaks

[Mike Galbraith]

On Sat, 2006-03-11 at 18:24 +1100, Con Kolivas wrote:
> On Saturday 11 March 2006 17:00, Mike Galbraith wrote:

> > If you're creating a lot of traffic, I can see it causing problems.  I
> > was under the impression that you were doing minimal IO and absolutely
> > trivial CPU.  That's what didn't make sense to me to be clear.
> 
> A lot of cpu would be easier to handle; it's using absolutely miniscule 
> amounts of cpu. The IO is massive though (and seeky in nature), and reading 
> from a swap partition seems particularly expensive in this regard.

There used to be a pages in flight 'restrictor plate' in there that
would have probably helped this situation at least a little.  But in any
case, it sounds like you'll have to find a way to submit the IO in itty
bitty synchronous pieces.

	-Mike

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