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

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I agree, but since you are saying this is in open stack environ, the Guest's parameters gets supplied through different input files for different type of Guests, better to check once. 

-----Original Message-----
From: JR [mailto:botemout@xxxxxxxxx] 
Sent: Thursday, May 15, 2014 11:33 PM
To: Venkateswara Rao Nandigam; kvm@xxxxxxxxxxxxxxx
Subject: Re: Poor performance with virtio network driver on windows 2008 R2 on KVM

Yes, thank you, Venkateswara, it is vhost=on is present.

This is something specific to driver in windows since, in linux it performs very well.

On 5/15/2014 1:41 PM, Venkateswara Rao Nandigam wrote:
> One more important thing is to make sure you launch vhost thread for your virtio nic, as part of Guest instantiation. There will be a parameter "vhost=on" in Guest instantiation command line.
> 
> -----Original Message-----
> From: kvm-owner@xxxxxxxxxxxxxxx [mailto:kvm-owner@xxxxxxxxxxxxxxx] On 
> Behalf Of Venkateswara Rao Nandigam
> Sent: Thursday, May 15, 2014 10:20 AM
> To: JR; kvm@xxxxxxxxxxxxxxx
> Subject: RE: Poor performance with virtio network driver on windows 
> 2008 R2 on KVM
> 
> 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@xxxxxxxxxxxxxxx [mailto:kvm-owner@xxxxxxxxxxxxxxx] On 
> Behalf Of JR
> Sent: Wednesday, May 14, 2014 9:07 PM
> To: kvm@xxxxxxxxxxxxxxx
> 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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