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Re: [Xen-users] Vanishing memory? Whats going on?

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Vanishing memory? Whats going on?
From: Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Date: Wed, 9 Jul 2008 15:38:08 +0100
Cc: bleomycin <diabolical@xxxxxxxxx>
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On Sunday 06 July 2008, bleomycin wrote:


> Thank you very much for the reply. I must not fully understand the point of
> hvm. Other than being used to run windows, I thought hvm was required to
> take full advantage of intel/amd's VT technology built into the newer
> processors? Or is that handled automatically regardless of hvm?

HVM is used only for running unmodified guest OSes.  That might be Windows, or 
you might have a requirement to run a specific Linux (or FreeBSD or other) 
guest that doesn't have a Xen-aware kernel (it might be a very old Linux that 
you need to support, for instance).

PV gives the highest levels of performance to a Xen guest, where available.  
There's not a way of using HVM hardware to accelerate PV guests at the moment 
but PV is still generally as-good-as or better performing than HVM.


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