Re: [Xen-users] PV OR HVM?

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

I'll give you my humble opinion - always use PV if it's available for your guest O/S.  There are very few reasons to run an O/S in an HVM if you can run it in a PV domU.  Performance in a PV domU will, generally speaking, be much better than in an HVM domU.

The issue you run into is that there are operating systems that do not support PV domU.  Windows is the classic example - you must run Windows in an HVM domU (even the new, enlightened version of Windows Server 2008).  There are a few other miscellaneous ones - NetWare and some of the older O/Ss.  Most modern Linux, NetBSD, and Solaris distributions can run in a PV domU.

Also search the archives for this mailing this - this topic has been discussed quite thoroughly in the recent past.

-Nick

>>> On 2009/08/31 at 19:54, chris <khris4@xxxxxxxxx> wrote:

Hello Guy's

I want to thank everyone out there that has given me there input on using xen. I want to ask what you give close to native speed when you using linux as a domU. Would pv be faster then Hardware virtualization using xen or paravirtual is faster because it works with xen kenern in a dom0? Just let eveyone know my servers can do both hvm and para-virtualization

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