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Re: [Xen-devel] VTx enabled + xen 3.0 stable IO performance...

  • To: "M S, Rajanish" <MS.Rajanish@xxxxxx>
  • From: "Rami Rosen" <rosenrami@xxxxxxxxx>
  • Date: Wed, 7 Jun 2006 20:30:50 +0200
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Wed, 07 Jun 2006 11:31:12 -0700
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 This question is very interesting indeed and bothered also me .

I googled for official benchmarks from Intel/AMD for performance
of Xen running on VT-x or AMD and could not
find any.

Had you looked at the following thread in xen-devel:
HVM network performance:

Though it speaks about network performance (and not disk I/O) I think
it may be  relevant.

You said:

Xen document says that the performance should >be
As I understand this refers to non-VT processors.

It seems to me that using QEMU in HVM
may cause slower performance than on non-VT
processors. (In non-VT processors Xen  does not use QEMU but uses
backend-frontend virtual device drivers, which seems more efficient).

Can anybody give I/O performance results on AMD
SVM processors (these processors have virtualization extensions).?

Rami Rosen

On 6/7/06, M S, Rajanish <MS.Rajanish@xxxxxx> wrote:


   Is there any IO performance results for Xen3.0.2 stable + VT enabled full
virtualization? Our tests shows 100,000 IOPs on Native linux(2.6.16) vs
75000 IOPs on domain 0 for the same kernel version for 512B IO size. Is this
expected behavior? Xen document says that the performance should be

  Also, it will be helpful if you could point us to any performance results
of Xen 3.0.

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