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

["Rami Rosen" <rosenrami@xxxxxxxxx>]

Hi,

 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:
http://lists.xensource.com/archives/html/xen-devel/2006-05/msg00183.html


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
> close-to-native.
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).?

Regards,
Rami Rosen






On 6/7/06, M S, Rajanish <MS.Rajanish@xxxxxx> wrote:
> Hi,
>
>
>
>    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
> close-to-native.
>
>
>
>   Also, it will be helpful if you could point us to any performance results
> of Xen 3.0.
>
>
>
> Thanks.
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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