[c-nsp] Prioritize PING traffic to control plane

[sthaug at nethelp.no]

> I found out that PING to control plane of the router/switch can result with
> spike Latency and this is normal since ICMP packet is low priority in the
> CPU processing. I'm wondering if there is any way that we can prioritize it
> so that I can get no spike latency when pinging to control Plane, I know
> it's not necessary to do so, somehow want to see if this can be done.

Sounds like a bad idea. You probably want the control plane to give
high priority to *important* control plane stuff, like keepalives and
other protocol processing. Prioritizing ICMP, especially if others are
able to trigger ICMP, would be an excellent way to DoS yourself...

Steinar Haug, Nethelp consulting, sthaug at nethelp.no