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Xen dom0 without a virtualization compatible CPU?
I'd like to know if Xen can work fine even if dom0 doesn't have a virtualization compatible CPU, like for example the T2450 or any other cheap dual core CPU...
Will it be very bad performance wise or can it be fine?
Is there a real difference when the CPU as a virtualization technology, as VT-x for example?
i guess Xen PV didn't need CPU virtualization compatibility. cmiiw
i didn't try this on dedicated server, but it worked when running Xen PV under Xen HVM. as far i know on Xen HVM the virtualization flags (vmx/svm) is disabled.
Hum, ok so even with a non-compatible processor (
http://wiki.xensource.com/xenwiki/HV...ble_Processors) HVM is supposed to run fine?
Any idea of the performance loss / difference between a non-compatible processor and a virtualization-compatible one?
no, you can run Xen PV in Xen HVM (virtualization under virtualized server). HVM itself still need CPU virtualization compatibility.
when you ask Xen,it could be between Xen PV and HVM.
Xen PV ~ CPU compatibility = not necessary.
Xen HVM ~ CPU compatibility = must have.
Ok, thanks. And for the end user, is there any other difference than the need to run a special kernel in the DomU?
Performance wise, is there a big difference from your experience between PV & HVM?
old thread it's doesn't look very different.
on my experience (with same server spec etc) disk I/O on HVM is slower than PV. but it can handled by installing PV driver for HVM.
Yes, sure the CPU with virtualization support is not necessary for Xen PV.
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