On 10/26/2009 10:58 AM, Gerd Hoffmann wrote:
On 10/23/09 17:54, Stefan wrote:
Hello,
I have a simple question (sorry I'm a kvm beginner):
Is it right that a 64bit guest (8 CPUs, 16GB) is
much faster than a 32bit guest (8 CPUs, 16GB PAE).
^^^^
Yes. With *that* much memory the 32bit guest struggles with address
space limitations (32bit -> 4G), whereas the 64bit guest doesn't.
With up to 1G you shouldn't see a noticable difference. But the more
highmem the 32bit guest uses the higher is the penalty. Especially
without ept/npt as every kmap() of a high page is a roundtrip to the
hypervisor then.
Oh yes, without ept/npt the slowdown should indeed be significant with
this much memory.
--
error compiling committee.c: too many arguments to function
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