Re: [RFC] [RFT] [PATCH] memory zone balancing

Rik van Riel
2000-01-04T15:47:53Z

On Tue, 4 Jan 2000, Rik van Riel wrote:

> d+r+h > limit
> d > limit/2
> r > limit/4
> h > limit/8

Ehmmm, wait. I messed up on this one.
We probably want to have a bit more freedom
so the page freeing algorithm doesn't do too
much scanning for nothing.

d+r+h > limit
d > limit/4
r > limit/4
h don't care, even on a 1.5GB machine h will
be 1/3 of total memory, so we'll usually
have a few free pages in here

> DMA pages should always be present, regular pages for
> storing pagetables and stuff need to be there too, higmem
> pages we don't really care about.
>
> Btw, I think we probably want to increase freepages.min
> to 512 or even more on machines that have >1GB of memory.
> The current limit of 256 was really intended for machines
> with a single zone of memory...
>
> (but on <1GB machines I don't know if it makes sense to
> raise the limit much more ... maybe we should raise the
> limit automagically if the page alloc/io rate is too
> high?)

Rik
--
The Internet is not a network of computers. It is a network
of people. That is its real strength.