Messages in this thread | | | Subject | Re: 2G memory split | From | Alan Cox <> | Date | Tue, 10 Jan 2006 20:55:19 +0000 |
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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.
Alan
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