[c-nsp] c7301 interrupt cpu / processor routed packets

[bill fumerola]

the mailman gremlins that prevent large posts from going through seem
to have eaten my post. apologies if you get this post and the moderator
approves my original at some point in the future.

i'll include the first paragraph:

at $WORK we use 7301s as border routers at our sites. recently, we've
seen an uptick in cpu. it's too difficult to isolate the change that was
made, but it's our belief that some feature or option has caused a
majority of packets to be run through the processor as opposed to through
cef/caches. this is happening on several routers, but i'll limit the
output to one of them.

rtr1.ash#sh proc cpu | e 0.0 
CPU utilization for five seconds: 52%/46%; one minute: 53%; five minutes: 57%
 PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process 
   5    35199292  87282048        403  0.47%  0.32%  0.52%   0 Pool Manager     
  46   5504888562337240730        235  4.79%  2.40%  3.62%   0 IP Input         
rtr1.ash#

all the cpu seems to be in interrupt context.

what i'm looking for from the list is a plethora of commands to investigate
what forwarding path is causing this. i've reached the end of my knowledge
on this platform.

the output i pasted into this mail can be found at:
http://mu.org/~billf/cisco-nsp.txt

thanks,

-- bill fumerola