[c-nsp] High interrupt load on 7507

[Pete Templin]

David Coulson wrote:

> Does using dot1q cause the RSP4 to interrupt rather than dCEF switch the
> packet? I'd like to try to get CPU down on the boxes, and it doesn't
> appear like the VIP processors are loaded (They run 30% tops, if that)
> during these times when the RSP is going nuts. I need to figure out what
> the best way to keep the RSP out of the way of packets is to avoid these
> periods of excessive interrupting, but I can't get rid of the VLANs and
> the router is already running dCEF on whatever it can. Since CEF
> requires an interrupt hit, am I just hitting my limit on what my RSP4
> can do?

It's my understanding that Ethernet subinterfaces are not dCEF in 12.0 
code.  :(

pt