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SubjectRe: vm issues (2)
On Tue, Feb 25, 2003 at 05:15:40PM +0100, Dejan Muhamedagic wrote:
> Andrea:
>
> On Tue, Feb 25, 2003 at 04:32:13PM +0100, Andrea Arcangeli wrote:
> > On Tue, Feb 25, 2003 at 01:13:28PM +0100, Dejan Muhamedagic wrote:
> > >
> > > The aa kernel keeps ~200MB out of 6GB of memory unused. I'm not
> > > sure, but if we could reduce it perhaps there would be much less
> > > swapping. Is there a way to achieve this?
> >
> > that is a feature, it guarantees highmem unfreeable allocations like
> > pagetables can't eat all your normal zone. You can reduce the 200MB with
> > this boot command:
> >
> > lower_zone_reserve=256,256
>
> But isn't 200MB too much? Where would the new setting put the

no, on a 6GB it isn't too much compared to risk wasting several giga of
highmem.

> reserve mark?

the new reserve mark will turn it to around 25mbyte, of course your risk
to run in normal zone shortages increases that way.

> > As to decrease the swapping I just told you how to do that tweaking
> > vm_mapped_ratio.
>
> Well, it has been set to 500, but it didn't make any difference
> (at least no obvious difference). Is there anything more one
> could do about that? The current level of swapping hurts
> performance quite a bit. This is what the meminfo looks
> like:

you can try 10000.

Andrea
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