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Re: Hardware recommendation request
On Thursday 28 August 2008 17:32:46 John Hayward wrote:
> I can tell I did not make part of my request clear.
> >> What chip and motherboard would work best with NetBSD-Xen to support
> ^--- here I was asking about AMD/Intel chips
Regarding paravirtualization, it does not matter if you have AMD or Intel.
Regarding hardware-virtualization, there is a big difference:
- AMD provides real mode in hw, Intel does not.
=> Instruction execution in real mode is emulated in software on Intel CPUs
by the hypervisor
=> Some guest OS's have boot problems on Intel CPUs
- AMD Barcelona/Phenoms feature the "Rapid Virtualization Indexing"
=> HVM guests *with PV drivers* can run up to 90-97% of native performance
HVM guests w/o PV drivers are slower due to IO overhead, but are still up
to 80% of native performance
AMD K8 and Intel CPUs don't have this feature, there you get about
60 - 70% of native performance
For more performance on Intel CPUs you have to wait for Nehalem
which will have this "Rapid Virtualization Indexing" (or however Intel will
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