<div dir="ltr">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.</div>
<div class="gmail_extra"><br clear="all"><div><div dir="ltr"><div><font><div style="font-family:arial;font-size:small"><b><i><br>Adam Lawson</i></b></div><div><font><font color="#666666" size="1"><div style="font-family:arial;font-size:small">
AQORN, Inc.</div><div style="font-family:arial;font-size:small">427 North Tatnall Street</div><div style="font-family:arial;font-size:small">Ste. 58461</div><div style="font-family:arial;font-size:small">Wilmington, Delaware 19801-2230</div>
<div style="font-family:arial;font-size:small">Toll-free: (844) 4-AQORN-NOW</div><div style="font-family:arial;font-size:small">Direct: +1 (302) 268-6914</div></font></font></div></font></div><div style="font-family:arial;font-size:small">
<img src="http://www.aqorn.com/images/logo.png" width="96" height="39"><br></div></div></div>
<br><br><div class="gmail_quote">On Thu, May 8, 2014 at 6:59 PM, JR <span dir="ltr"><<a href="mailto:botemout@gmail.com" target="_blank">botemout@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Greetings,<br>
<br>
My openstack grizzly cluster runs on ubuntu 12.04 servers with 10G NICs.<br>
I have ubuntu, centos and windows 2008 R2 guests. I've noticed that<br>
while both my linux guests can communicate at some reasonable<br>
approximation of 10G wire speed (e.g., 7-9Gb/sec on iperf tests), the<br>
windows guests max out at 2.5G when talking to the host on which they<br>
run, down to ~1.2G to other hosts.<br>
<br>
I've made some modifications as per this doc:<br>
<br>
<a href="http://www.linux-kvm.org/page/WindowsGuestDrivers/kvmnet/registry" target="_blank">http://www.linux-kvm.org/page/WindowsGuestDrivers/kvmnet/registry</a><br>
<br>
and upgraded my virtio network driver, but it's not helped. I've also<br>
done about an hour or two of googling which has revealed little.<br>
<br>
I understand that this is not an openstack issue, but, I suspect, others<br>
have encountered this when bringing 2008 R2 guests into their clusters.<br>
Anyone?<br>
<br>
Thanks much,<br>
JR<br>
<br>
<br>
<br>
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</blockquote></div><br></div>