<p dir="ltr">To see where the problem lies you could do an iperf test between two instances of the same tenant running on the same compute node.</p>
<p dir="ltr">The traffic would still pass through openvswitch, but not across the Vxlan tunnel.<br></p>
<div class="gmail_quote">On Oct 15, 2014 5:29 PM, "Sławek Kapłoński" <<a href="mailto:slawek@kaplonski.pl">slawek@kaplonski.pl</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
I found also that when I capture traffic from tap interface and check it in<br>
wireshark then I see a lot of TCP DUP ACK packets before disconnection.<br>
Guys, really anyone has got similar problem with vxlan and windows guests? or<br>
anyone is using windows on such instances?<br>
<br>
---<br>
Best regards<br>
Sławek Kapłoński<br>
<a href="mailto:slawek@kaplonski.pl">slawek@kaplonski.pl</a><br>
<br>
Dnia wtorek, 14 października 2014 20:30:28 Sławek Kapłoński pisze:<br>
> Hello,<br>
><br>
> I was trying with newest driver downloaded from<br>
> <a href="http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/" target="_blank">http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/</a><br>
> and also on older version.<br>
><br>
> I did small test with two instances on one host. Then all traffic is going<br>
> only via br-int bridge in ovs (no any vxlan tunnel) and problem was the<br>
> same. But when I manually remove both tap interfeces from ovs and put it<br>
> into linux bridge than I not have this issue. So imho there is some problem<br>
> with openvswitch.<br>
> I'm using 1.11 version of opensvitch but yesterday I build from sources<br>
> version 2.3.0 and still is the same :/<br>
> I'm using kernel 3.13 on compute hosts.<br>
> Really anyone have got such issue with vxlan tunnels and windows guests?<br>
><br>
> ---<br>
> Best regards<br>
> Sławek Kapłoński<br>
> <a href="mailto:slawek@kaplonski.pl">slawek@kaplonski.pl</a><br>
><br>
> Dnia wtorek, 14 października 2014 07:15:24 piszesz:<br>
> > Which virtio drivers are you using in your Windows guest?<br>
> ><br>
> > P<br>
> ><br>
> > On Oct 10, 2014 3:56 PM, "Sławek Kapłoński" <<a href="mailto:slawek@kaplonski.pl">slawek@kaplonski.pl</a>> wrote:<br>
> > > Hello,<br>
> > ><br>
> > > I have neutron with vxlan tenant networks. I'm using openvswitch to make<br>
> > > vxlan<br>
> > > tunnels.<br>
> > > Today I found strange problem with instances with Windows server<br>
> > > installed<br>
> > > on<br>
> > > guests. First problem is that tcp sessions (like RDP connection beetween<br>
> > > two<br>
> > > servers) in such tenant network are sometimes disconnected for a while<br>
> > > (like<br>
> > > packet loss in network). Second issue is that I have not good<br>
> > > performance<br>
> > > on<br>
> > > windows. My hosts have got 10Gbps network cards, I have set jumbo frames<br>
> > > (mtu=9000 on hosts) and if I set for example mtu=8950 on linux guests<br>
> > > than<br>
> > > I<br>
> > > have about 9Gbps when test with iperf. On windows I have about 2-2.5Gbps<br>
> > > with<br>
> > > mtu=1500 and even less with bigger mtu.<br>
> > > Do You maybe have such problems with windows guests using vxlan tunnels<br>
> > > network?<br>
> > > I'm testing it on Windows server 2012 R2.<br>
> > ><br>
> > > ---<br>
> > > Best regards<br>
> > > Sławek Kapłoński<br>
> > > <a href="mailto:slawek@kaplonski.pl">slawek@kaplonski.pl</a><br>
> > > _______________________________________________<br>
> > > OpenStack-operators mailing list<br>
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<br></blockquote></div>