RE: [Xen-users] Xen Performance

Joe Armstrong
Tue, 26 May 2009 14:25:04 -0000

> It shows that for some types of Disk IO, like sequential delete and
> random create Xen performs faster than native linux. A full comparison
> chart is attached as a pdf.
> The test are run first from native linux than both from Dom0 and a DomU
> with the same results.
>
Hi Amir,

Not an authoritative answer here... but I''ve see similar results just
running "hdparm" to see IO rates.
I''ve also seen in the past some amount of clock skew between host &
guest OS so it could be that the (possible) clock skew is causing your benchmark
to show higher than possible results... if your guest OS clock is even a little
slow it will effect results especially in short-term tests.

Joe