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* AQORN, Inc. 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 <[email protected]> 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 > > > > _______________________________________________ > Mailing list: > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : [email protected] > Unsubscribe : > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >
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