Comment 9 for bug 1328088

I wonder if this fix fell out or is somehow different now?

The below script, on 4.11rc7:

1cpu: 0m1.379s
12cpu: 1m36.556s
72cpu: 2m20.118s

This is a *huge* impact for neutron L3 agent on my OpenStack system.

# cd /tmp
# ip netns add foo
# ip netns add bar
# for i in `seq 0 1000` ; do echo -e 'netns exec foo echo\nnetns exec bar echo' >> ipnetns.batch ; done
# time ip -b ipnetns.batch > /dev/null