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On 02/10/13 22:49, James Page wrote:
>> sudo ip netns exec qrouter-d3baf1b1-55ee-42cb-a3f6-9629288e3221
>>> traceroute -n 10.5.0.2 -p 44444 --mtu traceroute to 10.5.0.2 
>>> (10.5.0.2), 30 hops max, 65000 byte packets 1  10.5.0.2  0.950
>>> ms F=1500  0.598 ms  0.566 ms
>>> 
>>> The PMTU from the l3 gateway to the instance looks OK to me.
> I spent a bit more time debugging this; performance from within
> the router netns on the L3 gateway node looks good in both
> directions when accessing via the tenant network (10.5.0.2) over
> the qr-XXXXX interface, but when accessing through the external
> network from within the netns I see the same performance choke
> upstream into the tenant network.
> 
> Which would indicate that my problem lies somewhere around the 
> qg-XXXXX interface in the router netns - just trying to figure out 
> exactly what - maybe iptables is doing something wonky?

OK - I found a fix but I'm not sure why this makes a difference;
neither my l3-agent or dhcp-agent configuration had 'ovs_use_veth =
True'; I switched this on, clearing everything down, rebooted and now
I seem symmetric good performance across all neutron routers.

This would point to some sort of underlying bug when ovs_use_veth = False.


- -- 
James Page
Ubuntu and Debian Developer
james.page at ubuntu.com
jamespage at debian.org
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