[nsp] High CPU question

[Terry Baranski]

> The high cpu spikes are associated with the increase in
> traffic levels.
> 
> They have 2 NSP facing FE interfaces loadbalancing EBGP 
> multihop and 3 Internal Network FE interfaces.  1 with a 
> /23 and 2 with /24's each.  They get to pushing around 
> 15Mb/s out each interface.  Total packets that the router 
> is processing is around 75k PPS at the point it is 
> dropping so it isn't near the 225k PPS the CPU can do.

Cisco's PPS ratings are for 64 byte packets.  Achievable PPS tends to
decrease as packet size increases.  These are also best case numbers;
i.e., a network tester shoving the packets through and probably nothing
enabled other than 'ip cef' and 'ip routing'.

-Terry