Re: test10-pre1 problems on 4-way SuperServer8050

From: Alan Cox (
Date: Wed Oct 11 2000 - 11:59:20 EST

> On Wed, 11 Oct 2000, Alan Cox wrote:
> > > I will continue to narrow down by removing some things (like mtrr) from
> > > the equation. Rik, the problem is that when one enables PAE (or just
> > > highmem-4G) support on a 4-way 6G RAM machine becomes 38-40 times slower.
> >
> > What happens if you boot a PAE kernel with mem=512M on that box ?
> >
> it works fine then. Kernel compiles in 68 seconds as it should. Shall I
> keep incrementing mem= to see what happens next...

The threshold is probably >1Gig, but see where it actually is, thats the point
the other zones and memory juggling kicks in

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