[c-nsp] Packet drops

[mack]

We have the odd situation of not seeing packet drops when
they should be and obviously are occurring.
We intentionally overloaded a ten gigabit line to test this.
The line was loaded to about 107%.
We were able to verify traffic going through the interface was getting dropped.
The fabric channels do not show any drops or over-utilization.
The incoming interfaces did not show any drops.
The outgoing interface was not showing drops under show interface,
show queueing interface, or show counters interface.  The packets were not getting dropped in software either.
They should be showing as dropping on the outgoing interface under show
queueing but they are not showing anywhere.

Does anyone know of another way (other than ping etc) to determine how
much traffic is actually getting dropped?
The configuration is listed below.
If anyone knows why this configuration is not showing drops properly,
please e-mail me or post to the list.
I am about ready to submit a case to cisco.

Software version is 12.2(18)SFX6.

LR Mack McBride
Network Administrator
Alpha Red, Inc.

------- relevant configuration (ip and description deleted) ----------

mls qos

interface TenGigabitEthernet12/1
 ip access-group INBOUND in
 ip access-group OUTBOUND out
 ip verify unicast source reachable-via any
 no ip redirects
 no ip proxy-arp
 load-interval 30
 wrr-queue bandwidth 10 15 20 0 0 0 20
 wrr-queue queue-limit 50 20 15 0 0 0 15
 wrr-queue random-detect 7
 wrr-queue cos-map 7 1 6 7
 wrr-queue cos-map 3 1 4
 tcam priority high
 no cdp enable
 no mop enabled
 service-policy input inbound.policy
 hold-queue 400 in
 hold-queue 400 out
end

---------------- relevant show queueing -----------------------

  Packets dropped on Transmit:

    queue     dropped  [cos-map]
    ---------------------------------------------
    1                        0  [0 1 ]
    2                        0  [2 3 4 ]
    3                        0  []
    4                        0  []
    5                        0  []
    6                        0  []
    7                        0  [6 7 ]
    8                        0  [5 ]

-----------------------------------------------------------------

6513-Sup720#show fabric channel-counters

 slot channel   rxErrors   txErrors    txDrops  lbusDrops
    4       0          0          0          0          0
    7       0          0          0          0          0
    8       0          0          0          0          0
    9       0          0          0          0          0
    9       1          0          0          0          0
   10       0          0          0          0          0
   10       1          0          0          0          0
   12       0          0          0          0          0
   12       1          0          0          0          0
   13       0          0          0          0          0
   13       1          0          0          0          0