[c-nsp] Troubleshooting Input Queue Drops on 7600 running 12.2(33)SRC5

[Devon True]

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All:

I am seeing increasing input queue drops on a 7600 running 12.2(33)SRC5
on a SPA-2X1GE in a 7600-SIP-400.

#sh int g1/1/1
GigabitEthernet1/1/1 is up, line protocol is up
  Hardware is GigEther SPA, address is 001d.7170.3500 (bia 001d.7170.3500)
  Description:
  Internet address is x.x.x.x/yy
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 72/255, rxload 46/255
  Encapsulation ARPA, loopback not set
  Keepalive not supported
  Full Duplex, 1000Mbps, link type is force-up, media type is SX
  output flow-control is unsupported, input flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 01:44:10
  Input queue: 0/75/1707/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 183245000 bits/sec, 41346 packets/sec
  5 minute output rate 283924000 bits/sec, 55078 packets/sec
     256319513 packets input, 149816057859 bytes, 0 no buffer
     Received 5 broadcasts (0 IP multicasts)
     0 runts, 1707 giants, 0 throttles
     1707 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     308870586 packets output, 193458081331 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

I also ran "sh int g1/1/1 switching" and it looks like the RP is
dropping the packets.

#sh int g1/1/1 switching
GigabitEthernet1/1/1
          Throttle count          0
        Drops         RP       1706         SP          0
  SPD Flushes       Fast          0        SSE          0
  SPD Aggress       Fast          0
 SPD Priority     Inputs       7257      Drops          0

     Protocol       Path    Pkts In   Chars In   Pkts Out  Chars Out
        Other    Process          0          0          0          0
            Cache misses          0
                    Fast          0          0          0          0
               Auton/SSE      15978     958680          0          0
           IP    Process   80379934 7498092736   42273104 3084247027
            Cache misses          0
                    Fast   68341283 5017154676    1197481   86714780
               Auton/SSE 401843915443 245108148367129 516300637842
386876899705145
      DEC MOP    Process          0          0      31700    2440900
            Cache misses          0
                    Fast          0          0          0          0
               Auton/SSE          0          0          0          0
          ARP    Process      15978     958680      15866     951960
            Cache misses          0
                    Fast          0          0          0          0
               Auton/SSE          0          0          0          0

Any advice on troubleshooting? I looked at
http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a0080094791.shtml
and "show buffers input-interface g1/1/1 header" does not display any
data and performing "debug ip packet" on a production router may not be
in my best interests. :)

- --
Devon
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