[c-nsp] How to troubleshoot input queue drop continuously on Cisco7600?

[PlaWanSai RMUTT CPE IX]

k1#sho int te1/4 | inc dro
  Input queue: 1/75/3907395/3653900 (size/max/drops/flushes); Total output
drops: 0

k1#sho int te1/4 | inc rat
  Queueing strategy: fifo
  30 second input rate 3,570,331,000 bits/sec, 365776 packets/sec
  30 second output rate 496789000 bits/sec, 231843 packets/sec
k1#sho int te1/3 | inc rat
  Queueing strategy: fifo
  30 second input rate 1,752,208,000 bits/sec, 185679 packets/sec
  30 second output rate 257731000 bits/sec, 122720 packets/sec
k1#sho int te1/2 | inc rat
  Queueing strategy: fifo
  30 second input rate 3,602,173,000 bits/sec, 425089 packets/sec
  30 second output rate 2326376000 bits/sec, 351745 packets/sec
k1#sho int te1/1 | inc rat
  Queueing strategy: fifo
  30 second input rate 371,024,000 bits/sec, 175235 packets/sec
  30 second output rate 2565494000 bits/sec, 291311 packets/sec

Traffics are we trying to put through this card about 9 Gbps.

k1#sho int te1/4 | inc dro
  Input queue: 1/75/3910272/3656732 (size/max/drops/flushes); Total output
drops: 0

Thank you very much.