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SubjectRe: VM test on 2.4.13-pre3aa1 (compared to 2.4.12-aa1 and 2.4.13-pre2aa1)


On Wed, 17 Oct 2001, Linus Torvalds wrote:

> In article <20011017004839.A15996@earthlink.net>, <rwhron@earthlink.net> wrote:
> >>
> >> So I'd suggest to try again after "echo 4 > /proc/sys/vm/page-cluster"
> >> to see if it makes any difference.
> >>
> >> Andrea
> >
> >You Rule!
> >
> >The tweak to page-cluster is basically magic for this test.
> >
> >With page-cluster=4, the mp3blaster sputtered like 2.4.13pre2aa1.
> >Better, but not beautiful.
> >
> >Real beauty happens with page-cluster=2. There is virtually no sputter.
> >And the wall clock time is a little better than 2.4.13pre2aa1!
>
> This is good information.
>
> The problem is that "page-cluster" is actually used for two different
> things: it's used for mmap page-in clustering, and it's used for swap
> page-in clustering, and they probably have rather different behaviours.

Its also used to limit the number of on flight swapouts. That different
meaning thingie sucks: I would say we need to separate that :)

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