Re: large page patch (fwd) (fwd)

Daniel Phillips
2002-08-09T18:06:49Z

On Friday 09 August 2002 18:31, Rik van Riel wrote:
> On Fri, 9 Aug 2002, Daniel Phillips wrote:
> > On Friday 09 August 2002 17:56, Linus Torvalds wrote:
>
> > > Also, I think the jury (ie Andrew) is still out on whether rmap is worth
> > > it.
> >
> > Tell me about it. Well, I feel strongly enough about it to spend the
> > next week coding yet another pte chain optimization.
>
> Well yes, we've _seen_ that 2.4 -rmap improves system behaviour,
> but we don't have any tools to _quantify_ that improvement.
>
> As long as the only measurable thing is the overhead (which may
> get close to zero, but will never become zero) the numbers will
> continue being against rmap. Not because of rmap, but just
> because the overhead is the only thing being measured ;)

You know what to do, instead of moaning about it. Just code up a test load
that blatantly favors rmap and post the results. In effect, that's what
Andrew's 'doitlots' benchmark does, in the other direction.

--
Daniel