Messages in this thread | | | Date | Tue, 10 Jan 2006 12:12:56 -0700 | From | "Jeff V. Merkey" <> | Subject | Re: 2G memory split |
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Alan Cox wrote:
>On Maw, 2006-01-10 at 09:56 -0700, Jeff V. Merkey wrote: > > >>RH ES uses 4:4 which is ideal and superior to this hack. >> >> > >Its a non trivial trade-off. 4/4 lets you run very large physical memory >systems much more efficiently than usual but you pay a cost on syscalls >and some other events when using the majority of processors. The 4/4 >tricks also give most emulations (eg Qemu) serious heartburn trying to >emulate %cr3 reloading via mmap and other interfaces with high overhead >in relative terms. > >Of course AMD64 kind of shot the problem in the head once and for all. > > >
Yep, they sure did. Seriously, the 4:4 option should also be present along with 3:1 and 2:2 splits. You should merge your RH work into this patch and allow both. It would save me one less patch to maintain off the tree.
Alan, you're the man.
:-)
Jeff
>Alan > > > >
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