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catalyst 3750G multicast packet loss

hello, I have setup a multicast network with a 3750G as below. There is 1 multicast group sending from the TX to RX servers, the 3750G is setup with as the RP.

TX Server <====> 3750G as RP <====> RX Server

I have observed some multicast packet loss on the switch, but I could not figure out what's the root cause of the packet loss. The cpus usage of the 3750G switch was always below 10%.

show version output

BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)

System returned to ROM by address error at PC 0x47BA34, address 0x0

System image file is "flash:c3750-ipservices-mz.122-35.SE5.bin"

cisco WS-C3750G-48TS (PowerPC405) processor (revision F0) with 118784K/12280K bytes of memory.

show platform port-asic stats drop

....

Supervisor TxQueue Drop Statistics

    Queue  0: 0

    Queue  1: 0

    Queue  2: 0

    Queue  3: 0

    Queue  4: 0

    Queue  5: 0

    Queue  6: 22689248

    Queue  7: 0

    Queue  8: 0

    Queue  9: 1269792

    Queue 10: 0

    Queue 11: 0

    Queue 12: 0

    Queue 13: 14

    Queue 14: 0

    Queue 15: 0

....

What's the root cost of the multicast packet loss even the multicast data rate is low?

Why the is some packet drop count in the "Supervisor TxQueue Drop Statistics"?

Thanks.

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