[Openstack-operators] Neutron nf_conntrack performance

Stuart Fox stuart at demonware.net
Sat Aug 16 06:44:06 UTC 2014

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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