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Hello,

I found also that when I capture traffic from tap interface and check it in 
wireshark then I see a lot of TCP DUP ACK packets before disconnection.
Guys, really anyone has got similar problem with vxlan and windows guests? or 
anyone is using windows on such instances? 

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

Dnia wtorek, 14 października 2014 20:30:28 Sławek Kapłoński pisze:
> 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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