Re: Poor performance with virtio network driver on windows 2008 R2 on KVM

[JR <botemout@gmail.com>]

We have tried TSO offload; no effect.

I'm thinking about passthough; I don't think that grizzly (openstack,
the environment in which I'm running) supports it. Not to say that
there's not a way to make it work but ...

Thanks
JR

On 5/15/2014 12:49 AM, Venkateswara Rao Nandigam wrote:
> Try TSO offload on Guest Virtio interface
> 
> And try passthrough interface mode at Host Level for this Guest Virtio Interface
> 
> Thanks,
> Venkatesh
> 
> -----Original Message-----
> From: kvm-owner@vger.kernel.org [mailto:kvm-owner@vger.kernel.org] On Behalf Of JR
> Sent: Wednesday, May 14, 2014 9:07 PM
> To: kvm@vger.kernel.org
> Subject: Poor performance with virtio network driver on windows 2008 R2 on KVM
> 
> Greetings all,
> 
> Though I don't believe that this is KVM problem per se, I'm seeing very poor network performance when using windows 2008R2 KVM instances with the virtio driver when on a 10G network.  iperf results show linux VMs getting close to wire speeds, while windows only does about 1.3Gb/sec.
> 
> I've tried a number of tcp settings (chimney, etc...) as recommended by some google searches but nothing has helped.
> 
> Does anyone have any advice?
> 
> Thanks much,
> JR
> 
> 
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