<div dir="ltr">Hey John<div><br></div><div>Thanks for replying. I just checked, ipv6 is already turned off :(</div><div>Any other places I could look?</div><div><br></div><div>BR,</div><div>Stuart</div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Sat, Aug 16, 2014 at 6:52 AM, John Edrington <span dir="ltr"><<a href="mailto:jle@cosmicfire.net" target="_blank">jle@cosmicfire.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="font-size:12pt;font-family:Calibri,sans-serif"><div>Hi Stuart, </div><div><br></div><div>I had a similar sounding problem on CentOS running icehouse (ksoftirqd/0 at 100%, tcpdump showed GRE router advertisement flood). The workaround I found was to disable ipv6 by editing /etc/sysctl.conf.</div>
<div><br></div><div>John</div><div><br></div><div>Sent from my mobile device.</div><div><div class="h5"><br><div>----- Reply message -----<br>From: "Stuart Fox" <<a href="mailto:stuart@demonware.net" target="_blank">stuart@demonware.net</a>><br>
To: "<a href="mailto:openstack-operators@lists.openstack.org" target="_blank">openstack-operators@lists.openstack.org</a>" <<a href="mailto:openstack-operators@lists.openstack.org" target="_blank">openstack-operators@lists.openstack.org</a>><br>
Subject: [Openstack-operators] Neutron nf_conntrack performance<br>Date: Sat, Aug 16, 2014 2:44 AM</div></div></div></div><div class="HOEnZb"><div class="h5"><br><div dir="ltr">Hey other ops!<div><br></div><div>Im having a serious problem with my neutron router getting spin locked in nf_conntrack_tuple_taken.</div>
<div>Has anybody else experienced it?</div><div>As the incoming request rate goes up, so nf_conntrack_tuple_taken runs very hot on CPU0 causing ksoftirqd/0 to run at 100%. At that point internal pings on the GRE network go sky high and its game over.</div>
<div><br></div><div>Ubuntu 14.04/Icehouse 2014.1.1 on an ibm x3550 with 4 10G intel nics.</div><div>eth0 - Mgt</div><div>eth1 - GRE</div><div>eth2 - Public</div><div>eth3 - unused </div><div><br></div><div>Any help very much appreciated!</div>
<div><br></div><div>BR,</div><div>Stuart</div></div>
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