OK, so then let's continue debugging a little bit then.

What's in the OVS log?

On Tue, Jul 08, 2014 at 10:55:11AM +0100, Joni Lee wrote:
> well, it's the latest ovs version that Canonical provides for Ubuntu precise.
> Which ovs version (in combination with which linux kernel version) would u 
> recommend for the best performance of ovs? Are there any related articles 
> about that??
> We could ask Canonical to support us..
> 
> 
> On Monday, July 7, 2014 5:27 PM, Ben Pfaff <b...@nicira.com> wrote:
>  
> 
> 
> Oh, this is OVS 1.4.6.? Any reason not to use a newer and still normally
> supported version of OVS?? It's hard to guess at issues with such an old
> version.
> 
> 
> On Thu, Jul 03, 2014 at 09:59:41AM +0100, Joni Lee wrote:
> > Hi Ben,
> > 
> > record for the next minute as follows. In some cases the "find Interface" 
> > can return a "ofport" (not empty), so the command "set Port tag" can be 
> > performed after the "add-port"
> > https://drive.google.com/file/d/0Bw07rcRwQIFydVZYX1hReGZhMU0/edit?usp=sharing
> > 
> > ?
> > On the other hand, the openStack folks must implement a failure handling 
> > for the case "ofport" is still empty after "add-port" returned successfully:
> > https://review.openstack.org/#/c/65838
> > 
> > ?
> > Also I want to remind our current version:
> > openvswitch: 1.4.6-0ubuntu1.12.04.2~lp1259285
> > Linux kernel: 3.2.0-51-generic
> > 
> > 
> > On Wednesday, July 2, 2014 9:55 PM, Ben Pfaff <b...@nicira.com> wrote:
> >? 
> > 
> > 
> > On Wed, Jul 02, 2014 at 11:05:57AM +0100, Joni Lee wrote:
> > 
> > > Thank you Ben,
> > > 
> > > - ovs-vswitchd.log did show that the port was added to br-int:
> > > 
> > > Jun 30 07:30:14|5422458|bridge|INFO|created port qr-3cc2ad9c-a3 on bridge 
> > > br-int
> > > 
> > > 
> > > - I only found this "No such device" suspicious. Is this logged by the 
> > > "find Interface" command? (because the command was executed exactly at 
> > > second 15 and returned empty "ofport")
> > > 
> > > Jun 30 07:30:15|5422579|netdev_linux|INFO|ioctl(SIOCGIFHWADDR) on 
> > > qr-3cc2ad9c-a3 device failed: No such device
> > > 
> > > - In the ovsdb log, the port was added to the db at second 13 
> > > successfully. But ovsdb log looks like it never records any entries for 
> > > "ofport" (i guess this is normal).
> > 
> > You showed us one record from the ovsdb log, could you show us the
> > records after that (for the next minute or so) also?
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