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SubjectRe: 2.4.23aa2 (bugfixes and important VM improvements for the high end)
On Fri, Mar 05, 2004 at 12:41:19PM -0800, Andrew Morton wrote:
> Andrea Arcangeli <andrea@suse.de> wrote:
> >
> > > > The main thing you didn't mention is the overhead in the per-cpu data
> > > > structures, that alone generates an overhead of several dozen mbytes
> > > > only in the page allocator, without accounting the slab caches,
> > > > pagetable caches etc.. putting an high limit to the per-cpu caches
> > > > should make a 32-way 32G work fine with 3:1 too though. 8-way is
> > > > fine with 32G currently.
> > >
> > > Humpf. Do you have a hard figure on how much it actually is per cpu?
> >
> > not a definitive one, but it's sure more than 2m per cpu, could be 3m
> > per cpu.
>
> It'll average out to 68 pages per cpu. (4 in ZONE_DMA, 64 in ZONE_NORMAL).

3m per cpu with all 3m in zone normal.
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