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1500 is too big with gre if you try to lower the 9000 by 4k it may work just a suggestion. I have seen several issues with the 1500 between instances performance is crappy a lot of frags 

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> Il giorno Jul 3, 2014, alle ore 19:13, Clint Dilks <clintd at waikato.ac.nz> ha scritto:
> 
> Hi,
> 
> I have a three node Icehouse Cluster running on CentOS 6.5 ( using RDO yum repostories but not installed via packstack ).  We are using GRE Tunnels, so experience the issues where some packets are truncated because they exceed the 1500 mtu size.
> 
> From what I have read most people are reducing the size of the guests MTU to work around the issue.  We thought another another approach would increasing the MTU size available.
> 
> So for the appropriate ports we have set the MTU to 9000 on the switch.
> 
> If we change the MTU on all nodes to 9000, then all pre-existing instance appear to work as expected (both before and after rebooting one or all nodes).  But launching a new instance is always stuck at scheduling.  Nothing is being recorded in /var/log/nova/scheduler.log on the controller.
> 
> If we revert all nodes back to MTU 1500 all starts working again.
> 
> Does anyone have suggestions as to what I am missing ?
> 
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