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Nexus 7000 output discards not matching policy-map drops.

I have a QoS service policy applied to a 10gig interface on a Nexus 7000.  'Show int' of the interface shows 1067 output discards, but a 'show policy-map' of the interace shows no drops in any of the classes.  This seems to imply that output discards are occurring, and yet there is not congestion at the time to force output queues to drop packets as required by the QoS policy map. The outputs of both show commands are below. What could cause output discards in this case?

ROC-NX7010B-CORE-B# sh int e2/7

Ethernet2/7 is up

  Dedicated Interface

  Hardware: 10000 Ethernet, address: 64a0.e740.5542 (bia 70ca.9b40.90c2)

  Description: DU-D

  Internet Address is 164.72.187.110/30

  MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec

  reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA

  full-duplex, 10 Gb/s, media type is 10G

  Beacon is turned off

  Auto-Negotiation is turned off

  Input flow-control is off, output flow-control is off

  Rate mode is dedicated

  Switchport monitor is off

  EtherType is 0x8100

  Last link flapped 3d07h

  Last clearing of "show interface" counters 21:49:50

  30 seconds input rate 3095840 bits/sec, 825 packets/sec

  30 seconds output rate 9884928 bits/sec, 1888 packets/sec

  Load-Interval #2: 5 minute (300 seconds)

    input rate 3.59 Mbps, 968 pps; output rate 11.23 Mbps, 1.81 Kpps

  L3 in Switched:

    ucast: 0 pkts, 0 bytes - mcast: 0 pkts, 0 bytes

  L3 out Switched:

    ucast: 116744989 pkts, 63298925848 bytes - mcast: 0 pkts, 0 bytes

  RX

    100607249 unicast packets  33626 multicast packets  0 broadcast packets

    100640877 input packets  31998358300 bytes

    0 jumbo packets  0 storm suppression packets

    0 runts  0 giants  0 CRC  0 no buffer

    0 input error  0 short frame  0 overrun   0 underrun  0 ignored

    0 watchdog  0 bad etype drop  0 bad proto drop  0 if down drop

    0 input with dribble  0 input discard

    0 Rx pause

  TX

    117941510 unicast packets  28945 multicast packets  0 broadcast packets

    117970455 output packets  63555760528 bytes

    0 jumbo packets

    0 output error  0 collision  0 deferred  0 late collision

    0 lost carrier  0 no carrier  0 babble  1067 output discard

    0 Tx pause

  0 interface resets

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

ROC-NX7010B-CORE-B# sh policy-map int e2/7

Global statistics status :   enabled

Ethernet2/7

  Service-policy (queuing) input:   default-in-policy

    SNMP Policy Index:  301990105

    Class-map (queuing):   in-q1 (match-any)

      queue-limit percent 50

      bandwidth percent 80

      queue dropped pkts : 0

    Class-map (queuing):   in-q-default (match-any)

      queue-limit percent 50

      bandwidth percent 20

      queue dropped pkts : 0

  Service-policy (queuing) output:   10gig-OUT

    SNMP Policy Index:  301990657

    Class-map (queuing):   1p7q4t-out-pq1 (match-any)

      priority level 1

      queue-limit percent 15

      queue dropped pkts : 0

    Class-map (queuing):   1p7q4t-out-q2 (match-any)

      queue-limit percent 25

      random-detect cos-based

      random-detect cos 7 minimum-threshold percent 95 maximum-threshold percent 100

      random-detect cos 6 minimum-threshold percent 90 maximum-threshold percent 95

      random-detect cos 3 minimum-threshold percent 85 maximum-threshold percent 90

      bandwidth remaining percent 22

      queue dropped pkts : 0

    Class-map (queuing):   1p7q4t-out-q3 (match-any)

      queue-limit percent 25

      random-detect cos-based

      random-detect cos 2 minimum-threshold percent 90 maximum-threshold percent 100

      bandwidth remaining percent 5

      queue dropped pkts : 0

    Class-map (queuing):   1p7q4t-out-q-default (match-any)

      queue-limit percent 35

      random-detect cos-based

      random-detect cos 1 minimum-threshold percent 80 maximum-threshold percent 90

      random-detect cos 0 minimum-threshold percent 90 maximum-threshold percent 100

      bandwidth remaining percent 73

      queue dropped pkts : 0

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