🚀 go-pugleaf

Why would an AGS+ running at ~20% busy most the time???

The 24-hour CPU busy graph for one of our AGS+s indicated the
router CPU is always 17% busy, even at 1:00 A.M. (which the router
should be fairly idle):

	00:30  CPU Busy Time: 5 Sec.: 27%, 1 Min.: 20%, 5 Min.: 20%
	00:35  CPU Busy Time: 5 Sec.: 18%, 1 Min.: 18%, 5 Min.: 18%
	00:40  CPU Busy Time: 5 Sec.: 18%, 1 Min.: 18%, 5 Min.: 18%
	00:45  CPU Busy Time: 5 Sec.: 18%, 1 Min.: 18%, 5 Min.: 18%
	00:50  CPU Busy Time: 5 Sec.: 19%, 1 Min.: 19%, 5 Min.: 19%
	00:55  CPU Busy Time: 5 Sec.: 19%, 1 Min.: 19%, 5 Min.: 19%
	01:00  CPU Busy Time: 5 Sec.: 18%, 1 Min.: 18%, 5 Min.: 18%
	01:05  CPU Busy Time: 5 Sec.: 18%, 1 Min.: 17%, 5 Min.: 17%
	01:10  CPU Busy Time: 5 Sec.: 20%, 1 Min.: 19%, 5 Min.: 19%
	01:15  CPU Busy Time: 5 Sec.: 18%, 1 Min.: 18%, 5 Min.: 18%
	01:20  CPU Busy Time: 5 Sec.: 26%, 1 Min.: 19%, 5 Min.: 19%
	01:25  CPU Busy Time: 5 Sec.: 19%, 1 Min.: 18%, 5 Min.: 18%
	01:30  CPU Busy Time: 5 Sec.: 25%, 1 Min.: 19%, 5 Min.: 19%

The 24-hour cpu_busy statistics with five-minute polling interval:

 time   mean    max     median  min     stddev  95%     99%     99.5%   99.9%
 =============================================================================
 5-sec  23.94   46.00   23.00   17.00   5.57    35.00   43.00   43.00   45.00
 1-min  21.04   43.00   19.00   17.00   4.69    33.00   38.00   39.00   41.00
 5-min  20.67   40.00   19.00   17.00   4.46    32.00   38.00   38.00   39.00

The AGS+ is configured with 2 MCI (2E+2S), 3 MEC (6E) cards, where
3 of the 4 serial ports and 19 of the 22 ethernet ports are in-use.
All the un-configured ports are marked shutdown.

We do turn on IP accounting, some access-groups, few secondary addresses,
couple IGRP redistribute groups, and few dozen static routes.

Clues/pointers are very much appreciated!

Paul.Liu@ATT.COM