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xen-users
Re: [Xen-users] Original Kernel or HVM
What domU will be work faster: with basic kernel or with HVM kernel?
Here are your options for kernel selection and virtualization mode:
Virtualiztion: Paravirtualized (PV) or HVM
Kernels that work with HVM: Any unmodified kernel
Kernels that work with PV: Xen PV Kernel -OR- Unmodified kernel with
PV_OPS support
IIRC PV_OPS support is now in the mainstream kernel tree. I am able to
use Ubuntu 9.04 unmodified kernels in Xen PV mode.
As for which is faster, I have only used HVM a little bit to get a fresh
install up before converting to PV. I though I/O was too slow in HVM
mode. In HVM mode I saw about 40% of the I/O capacity I was able to
obtain in PV mode. I have been running all my domUs paravirtualized since.
That said, I guess that there is some availability for Xen specific
block device and network drivers that can be installed on a domU running
in HVM mode. I have read that this bring I/O performance up to a level
comparable with operating in PV mode. I have not tried this myself but
if you want to run Windows or something else you can't paravirtualize, I
would look into that.
-- Thaddeus
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