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

[Traynor, Kevin]

> -----Original Message-----
> From: discuss [mailto:discuss-bounces at openvswitch.org] On Behalf Of
> Kochba, Alon
> Sent: Tuesday, April 26, 2016 4:38 PM
> To: Ben Pfaff <blp at ovn.org>; 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
> 
> 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/f519a72d9a3708fbc5f796f176e7
> c8bd3dcfb738
> 
> 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.

It sounds similar to the problem that this commit fixed. If so the fix
is applied to master and 2.5 branches.

https://github.com/openvswitch/ovs/commit/61c4e39460a7db3be7262a3b2af767a84167a9d8

> 
> 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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