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[Bug 1270646] Re: PMTUd / DF broken in GRE tunnel configuration

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Robert Collins <1270646@xxxxxxxxxxxxxxxxxx>
Date: Sun, 19 Jan 2014 22:36:41 -0000
Reply-to: Bug 1270646 <1270646@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

pmtud is enabled:
cat /proc/sys/net/ipv4/ip_no_pmtu_disc 
0


** Also affects: neutron
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1270646

Title:
  PMTUd / DF broken in GRE tunnel configuration

Status in OpenStack Neutron (virtual network service):
  New
Status in tripleo - openstack on openstack:
  Triaged

Bug description:
  PMTUd / DF is broken in our GRE tunnel configuration - slow network
  performance with ovs 1.10.2, pulled the MTU on the VM down to 1440 and
  10MB/s from LA to the UK.

  Thats with both the 1.10.2 dkms package from Ubuntu and the 3.11
  kernel datapath

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