[Openstack-operators] Neutron nf_conntrack performance
stuart at demonware.net
Sat Aug 16 16:00:19 UTC 2014
Thanks for replying. I just checked, ipv6 is already turned off :(
Any other places I could look?
On Sat, Aug 16, 2014 at 6:52 AM, John Edrington <jle at cosmicfire.net> wrote:
> Hi Stuart,
> 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.
> Sent from my mobile device.
> ----- Reply message -----
> From: "Stuart Fox" <stuart at demonware.net>
> To: "openstack-operators at lists.openstack.org" <
> openstack-operators at lists.openstack.org>
> Subject: [Openstack-operators] Neutron nf_conntrack performance
> Date: Sat, Aug 16, 2014 2:44 AM
> Hey other ops!
> Im having a serious problem with my neutron router getting spin locked in
> Has anybody else experienced it?
> 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.
> Ubuntu 14.04/Icehouse 2014.1.1 on an ibm x3550 with 4 10G intel nics.
> eth0 - Mgt
> eth1 - GRE
> eth2 - Public
> eth3 - unused
> Any help very much appreciated!
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