Re: [Xen-users] Original Kernel or HVM

["Thaddeus J. Hogan" <thaddeus@xxxxxxxxxx>]

> 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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