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

[Peter Kieser]

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

-Peter

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.

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