[Openstack] vxlan network and windows on guests

Sławek Kapłoński slawek at kaplonski.pl
Fri Oct 10 19:55:53 UTC 2014


I have neutron with vxlan tenant networks. I'm using openvswitch to make vxlan 
Today I found strange problem with instances with Windows server installed on 
guests. First problem is that tcp sessions (like RDP connection beetween two 
servers) in such tenant network are sometimes disconnected for a while (like 
packet loss in network). Second issue is that I have not good performance on 
windows. My hosts have got 10Gbps network cards, I have set jumbo frames 
(mtu=9000 on hosts) and if I set for example mtu=8950 on linux guests than I 
have about 9Gbps when test with iperf. On windows I have about 2-2.5Gbps with 
mtu=1500 and even less with bigger mtu.
Do You maybe have such problems with windows guests using vxlan tunnels 
I'm testing it on Windows server 2012 R2.

Best regards
Sławek Kapłoński
slawek at kaplonski.pl
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