Re: [PATCH] (2/2) reverse mappings for current 2.5.23 VM

Rik van Riel
2002-06-19T17:18:31Z

On Wed, 19 Jun 2002, Daniel Phillips wrote:

> > > 2.5.23-rmap (this patch -- "rmap-minimal"):
> > > Total kernel swapouts during test = 24068 kB
> > > Total kernel swapins during test = 6480 kB
> > > Elapsed time for test: 133 seconds
> > >
> > > 2.5.23-rmap13b (Rik's "rmap-13b complete") :
> > > Total kernel swapouts during test = 40696 kB
> > > Total kernel swapins during test = 380 kB
> > > Elapsed time for test: 133 seconds

> You might conclude from the above that the lru+rmap is superior to
> aging+rmap: while they show the same wall-clock time, lru+rmap consumes
> considerably less disk bandwidth. Naturally, it would be premature to
> conclude this from one trial on one load.

On the contrary, aging+rmap shows a lot less swapins.

The fact that it has more swapouts than needed means
we need to fix one aspect of the thing (page_launder),
it doesn't mean we should get rid of the whole thing.

kind regards,

Rik
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