[ovs-discuss] ovs get stuck when running traffic from VM to VM on same compute

Ben Pfaff blp at ovn.org
Tue Apr 26 15:48:37 UTC 2016


Daniele, can you help Alon out?  I believe that you were tracking this
problem.

On Tue, Apr 26, 2016 at 03:37:59PM +0000, Kochba, Alon wrote:
> Hi Ben,
> 
> Could you point us to the commit that fixed this issue?
> We already tried patching with this commit which seemed relevant, but the issue still recreated - https://github.com/openvswitch/ovs/commit/f519a72d9a3708fbc5f796f176e7c8bd3dcfb738
> 
> We will retry with your suggestion of using the 2.5 branch code, but we might want to backport the specific fix unless there is a 2.5.1 release including it.
> If the commit linked above is the one you were thinking of, please note a small difference - in the commit the rcu is blocked waiting for vhost_thread to quiesce, while in our case rcu is blocked waiting for pmd to quiesce.
> 
> Thanks,
> --alon
> 
> 
> -----Original Message-----
> From: discuss [mailto:discuss-bounces at openvswitch.org] On Behalf Of Ben Pfaff
> Sent: יום ה 21 אפריל 2016 19:54
> To: Yi Ba <yby.developer at yahoo.com>
> Cc: bugs at openvswitch.org
> Subject: Re: [ovs-discuss] ovs get stuck when running traffic from VM to VM on same compute
> 
> On Thu, Apr 21, 2016 at 01:24:35PM +0000, Yi Ba wrote:
> >      
> >    - What you did that make the problem appear.   
> > launching 2 VMs on the same host. The host has ovs-dpdk and the VM ports are vhostuser. Generating bi-directional traffic (each VM sends to the other) using dpdk from within the VMs.   
> > 
> >    - What you expected to happen.   
> > Traffic will run with no issues   
> > 
> >    - What actually happened.   
> > The OVS gets stuck. See attached the relevant of the ovs-vswitchd.log   
> > 
> >    
> >    - The Open vSwitch version number (as output by ovs-vswitchd --version)   
> > 2.5.0   
> 
> It's fixed on branch-2.5, please upgrade.
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