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Re: [Xen-users] Why HVM?

To: Jonathan Tripathy <jonnyt@xxxxxxxxxxx>
Subject: Re: [Xen-users] Why HVM?
From: Frédéric VANNIÈRE <frederic@xxxxxxxxxxx>
Date: Tue, 31 Aug 2010 10:40:28 +0200
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Le 27 août 2010 à 08:41, Jonathan Tripathy a écrit :
> I've noticed some VPS hosting companies offering a Xen "HVM" option. What are 
> the advantages of a Linux HVM VPS over a PV one?

I'm working for a hosting company and seriously considering switching to HVM 
instead of PV.

We are using PV x86_64 linux guests for several years (100+ VMs) and I've just 
discovered that PV guest where very bad on some benchmarks involving many 
process creation (unixbench).  

The Host : Xeon L5530 (HT disabled) , 24 GB mémory    
The guest : 4 vCPUS, 20 GB memory.

Unixbench  :     host = 4000,       PV guest = 1500,        HVM guest = 3900

With modern CPUs (Xeon 5500 and 5600 here) and new PV drivers on the guest 
(Linux 2.6.36)  HVM gives very low overhead and the performances of HVM guests 
are very closed to PV guests.  

With HVM you can use Remus and memory sharing. 


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