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Hi
Can you provide some more information regarding your deployment?

Can you check which kernel you are using.

uname -a

If you are using a 3.19 kernel changes to some locking code in the kennel broke synchronization dpdk2.0 and requires dpdk 2.1 to be used instead.
In general it is not advisable to use a 3.19 kernel with dpdk as it can lead to non-deterministic behavior.

When devstack hangs can you connect with a second ssh session and run 
	sudo service ovs-dpdk status
and 
	ps aux | grep ovs


When the deployment hangs at sudo ovs-vsctl br-set-external-id br-ex bridge-id br-ex
It usually means that the ovs-vswitchd process has exited.

This can happen for a number of reasons.
The vswitchd process may exit if it  failed to allocate memory (due to memory fragmentation or lack of free hugepages)
if the ovs-vswitchd.log is not available can you check the the hugepage mount point was created in
/mnt/huge And that Iis mounted 
Run 
	ls -al /mnt/huge 
and 
	mount

then checkout how many hugepages are mounted

	cat /proc/meminfo | grep huge


the vswitchd process may also exit if it  failed to initializes dpdk interfaces.
This can happen if no interface is  compatible with the igb-uio or vfio-pci drivers
(note in the vfio-pci case all interface in the same iommu group must be bound to the vfio-pci driver and
The iommu must be enabled in the kernel command line with VT-d enabled in the bios)

Can you  check which interface are bound to the dpdk driver by running the following command

	/opt/stack/DPDK-v2.0.0/tools/dpdk_nic_bind.py --status


Finally can you confim that ovs-dpdk compiled successfully by either check the xstack.log or 
Checking for the BUILD_COMPLETE file in /opt/stack/ovs

Regards
sean




-----Original Message-----
From: Samta Rangare [mailto:samtarangare at gmail.com] 
Sent: Monday, November 9, 2015 2:31 PM
To: Czesnowicz, Przemyslaw
Cc: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [networking-ovs-dpdk]

Thanks for replying Przemyslaw, there is no ovs-vswitchd.log in /opt/stack/logs/. This is all contains inside (ovsdb-server.pid, screen).

When I cancel stack .sh (ctr c), and try to rerun this $sudo ovs-vsctl br-set-external-id br-ex bridge-id br-ex it didnt hang, that means vSwitch was running isn't it ?

But rerunning stack.sh after unstack hangs again.

Thanks,
Samta

On Mon, Nov 9, 2015 at 7:50 PM, Czesnowicz, Przemyslaw <przemyslaw.czesnowicz at intel.com> wrote:
> Hi Samta,
>
> This usually means that the vSwitch is not running/has crashed.
> Can you check in /opt/stack/logs/ovs-vswitchd.log ? There should be an error msg there.
>
> Regards
> Przemek
>
>> -----Original Message-----
>> From: Samta Rangare [mailto:samtarangare at gmail.com]
>> Sent: Monday, November 9, 2015 1:51 PM
>> To: OpenStack Development Mailing List (not for usage questions)
>> Subject: [openstack-dev] [networking-ovs-dpdk]
>>
>> Hello Everyone,
>>
>> I am installing devstack with networking-ovs-dpdk. The local.conf 
>> exactly looks like the one is available in /opt/stack/networking-ovs- 
>> dpdk/doc/source/_downloads/local.conf.single_node.
>> So I believe all the necessary configuration will be taken care.
>>
>> However I am stuck at place where devstack is trying to set 
>> external-id ($ sudo ovs-vsctl br-set-external-id br-ex bridge-id 
>> br-ex). As soon as it hits at this place it's just hangs forever. I 
>> tried commenting this line from
>> lib/neutron_plugin/ml2 (I know this is wrong) and then all services 
>> came up except ovs-dpdk agent and ovs agent.
>>
>> BTW I am deploying it in ubuntu 14.04. Any pointer will be really helpful.
>>
>> Thanks,
>> Samta
>>
>> __________________________________________________________
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