[ovs-discuss] Drops in OVS

[Abhishek Verma]

>
> >
> > I just see *4424 *packets getting lost. What are these packets? Any idea
> > when would we lose them?
>
> "lost" means that a queue from the kernel to userspace overflowed.  It
> would ordinarily happen if there was a big burst of packets that didn't
> match in the kernel flow table.
>

But this wouldnt ever happen if i have an explicit flow-rule added that
says, for example, that all packets with a certain IP address coming on a
certain OVS port must go out on a certain OVS port. In that case i already
have a flow programmed before the packets started arriving. That way i can
at least rule out the packet drops because of the reason you cited above.

Is this correct?


Packets can also be lost this way if OVS is stopped and restarted.
>
> Since this is a GRE tunnel, packets can get lost in the kernel TCP/IP
> stack GRE processing on ingress or egress, and that wouldn't show up in
> any of these places.
>

Do you know if there are any stats that i could look at in the Linux kernel
that will give me these stats?

Thanks, Abhishek
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://openvswitch.org/pipermail/ovs-discuss/attachments/20150731/6457f017/attachment-0002.html>