[Openstack] Very poor windows 2008 R2 network performance (iperf)

Adam Lawson alawson at aqorn.com
Fri May 9 04:29:45 UTC 2014

Look at the TCP stack within Windows and optimizations recommended by
Microsoft. I don't think it's a KVM or openstack question to be honest. We
ran into similar issues on plain old Win2008 R2 servers that were running
on bare metal. Will update again when I ping someone to find out what
specifically it was back then.

*Adam Lawson*
427 North Tatnall Street
Ste. 58461
Wilmington, Delaware 19801-2230
Toll-free: (844) 4-AQORN-NOW
Direct: +1 (302) 268-6914

On Thu, May 8, 2014 at 6:59 PM, JR <botemout at gmail.com> wrote:

> Greetings,
> My openstack grizzly cluster runs on ubuntu 12.04 servers with 10G NICs.
> I have ubuntu, centos and windows 2008 R2 guests.  I've noticed that
> while both my linux guests can communicate at some reasonable
> approximation of 10G wire speed (e.g., 7-9Gb/sec on iperf tests), the
> windows guests max out at 2.5G when talking to the host on which they
> run, down to ~1.2G to other hosts.
> I've made some modifications as per this doc:
> http://www.linux-kvm.org/page/WindowsGuestDrivers/kvmnet/registry
> and upgraded my virtio network driver, but it's not helped.  I've also
> done about an hour or two of googling which has revealed little.
> I understand that this is not an openstack issue, but, I suspect, others
> have encountered this when bringing 2008 R2 guests into their clusters.
> Anyone?
> Thanks much,
> JR
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