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Re: [Xen-devel] Re: [PATCH 0 of 12] PV on HVM Xen

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH 0 of 12] PV on HVM Xen
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Mon, 24 May 2010 20:51:00 +0100
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Christian Tramnitz <chris.ace@xxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
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On Mon, 24 May 2010, Pasi Kärkkäinen wrote:
> Hmm.. are you sure kernbench is a proper benchmark for disk IO? 
> kernel compilations fire up a lot of new processes, and that favours HVM 
> guests.
> Basicly it seems really weird to me that in the results HVM (without PV 
> drivers) 
> is faster than pure PV..
> If you compare pure disk-IO PV vs. HVM the difference is usually big.. 
> PV beating HVM hands down.

32 bit PV certainly would, even on a kernbench, but keep in mind that 64
bit PV is not as fast.
In any case, like Jeremy previously said, it all depends on the
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