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Hello,

I was trying with newest driver downloaded from 
http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/
and also on older version.

I did small test with two instances on one host. Then all traffic is going 
only via br-int bridge in ovs (no any vxlan tunnel) and problem was the same. 
But when I manually remove both tap interfeces from ovs and put it into linux 
bridge than I not have this issue. So imho there is some problem with 
openvswitch.
I'm using 1.11 version of opensvitch but yesterday I build from sources 
version 2.3.0 and still is the same :/
I'm using kernel 3.13 on compute hosts.
Really anyone have got such issue with vxlan tunnels and windows guests?

---
Best regards
Sławek Kapłoński
slawek at kaplonski.pl

Dnia wtorek, 14 października 2014 07:15:24 piszesz:
> Which virtio drivers are you using in your Windows guest?
> 
> P
> 
> On Oct 10, 2014 3:56 PM, "Sławek Kapłoński" <slawek at kaplonski.pl> wrote:
> > Hello,
> > 
> > I have neutron with vxlan tenant networks. I'm using openvswitch to make
> > vxlan
> > tunnels.
> > 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
> > network?
> > I'm testing it on Windows server 2012 R2.
> > 
> > ---
> > Best regards
> > Sławek Kapłoński
> > slawek at kaplonski.pl
> > _______________________________________________
> > OpenStack-operators mailing list
> > OpenStack-operators at lists.openstack.org
> > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
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