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

[JR <botemout@gmail.com>]

Hi Peter,

Thanks for the advise.  How does the intel driver perform?  Wirespeed
range?  (Or, did you make the change more to fix the freezing rather
than to up the performance?)

Thanks
JR

On 5/15/2014 1:27 PM, Peter Kieser wrote:
> 
> On 2014-05-14 8:37 AM, JR wrote:
>> 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
>>
>>
> 
> I ran into similar issues with the Redhat virtio drivers, and the guest
> would freeze with high transfer. I switched to the emulated e1000 NIC
> and haven't had any problems since.
> 
> -Peter
> 

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