[ovs-discuss] [ovs-dev] debugging OVS

[Ben Pfaff]

[dropping mininet-discuss because it is a closed mailing list and I am
not a subscriber]

On Thu, Sep 18, 2014 at 05:37:43PM -0400, samantha Andares wrote:
> I am getting packets dropped when going out of an OVS bridge. The TX
> dropped is increased in ovs-dpctl but not at the physical interface
> level (ifconfig).
>
> Can anyone tell me how to enable some OVS debugging so I can find the
> reason to fix that problem?

Do you mean that ovs-dpctl shows the datapath's "drop" count is going
up?  If so, the problem is that packets that need attention from
userspace are arriving faster than userspace can process them.  The best
way to reduce drops is to upgrade to the latest version of Open vSwitch,
which is 2.3, because we've spent a lot of time the last few years
coming up with ways to reduce the number of packets that have to be sent
to userspace.  If you are already using 2.3, then I am surprised that
you are seeing lots of drops.  Is there anything unusual about your
environment or the traffic that you are using?