iperf problem with Windows SMP VM

iperf problem with Windows SMP VM

[ANNIE LI]

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?

My configure file is as following:

acpi = 1
apic = 1
boot = 'c'
builder = 'hvm'
bootloader = '/usr/bin/pygrub'
device_model = '/usr/lib/xen/bin/qemu-dm'
disk = [
'file:/mnt/data/win2k3/Sys.img,hda,w!',
]
kernel = '/usr/lib/xen/boot/hvmloader'
memory = '600'
name = 'win2k3_s'
on_crash = ''
on_reboot = ''
serial = 'pty'
timer_mode = 1
usbdevice = 'tablet'
vcpus = 1
vif = [
'type=ioemu, mac=00:16:3E:55:D1:80, bridge=xenbr0',
]
vnc = 1
vncconsole = 1
vnclisten = '0.0.0.0'
vncpasswd = ''
vncunused = 1


Thanks
Annie.

RE: iperf problem with Windows SMP VM

[James Harper]

> 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

Re: iperf problem with Windows SMP VM

[ANNIE LI]

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James,

Thanks a lot. I will have a test on xen3.3.1.

Thanks
Annie

James Harper wrote:
>> 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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