RE: [Xen-devel] iperf problem with Windows SMP VM

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> Hi
> 
> I am developing Window pv network driver and hit a problem now.
> 
> My server use Xen 3.1.4 and have 2 physical CPUs. When I create two VM
> with 1 VCPU on a same server, iperf performance is OK between those
two
> VM, but there is performance degradation between those 2 VM when i
> increase VCPU from 1 to 2.
> This problem occurs in QEMU mode too.
> 
> Does Xen 3.1.4 has such problem or anything wrong in my configure
file?
> 

Annie,

I think it would be worthwhile testing Xen-3.3.1 as I get comparable
performance on SMP vs UP under 2003 (around 80% I think).

Under XP, SMP and UP performance are much closer, due to the way
interrupts are handled (according to the guys on the ntdev list).

James

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