WiSM error message : Message: CPU Receive Multicast Queue is full on Controller

Hi,
I heve several WiSM modules, the version is 7.0.220.0. Each of WiSM receive the following error message : CPU Receive Multicast Queue is full on Controller. I searched the bug toolkit, some old version of WLC hit this bug, but not affect our version.. Please help to mention me how to debug this error.
Best Regards,

Multicast Queue Depth
The multicast queue depth is 512 packets on all controller platforms. However, the following message might appear on 2106 controllers: “Rx Multicast Queue is full on Controller.” This message does not appear on 4400 series controllers because the 4400 NPU filters ARP packets while all forwarding (multicast or otherwise) and multicast replication are done in the software on the 2106.
This message appears when too many multicast messages are sent to the CPU. In controller software releases prior to 5.1, multicast, CDP, and ARP packets share the same queue. However, in software releases 5.1 and later, these packets are separated into different queues. There are currently no controller commands that can be entered to determine if the multicast receive queue is full. When the queue is full, some packets are randomly discarded.
Do you have a lot of clients using multicast ?
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin

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There have been many post similar to yours, except you have the WiSM2. From other post, it seems like it doesn't affect performance but more of an eye sore. I guess you can wait to see if one of the Cisco engineer respond to your post and maybe try will be able to clarify why you see than my assumption of an "eye sore":)
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Hi Peter,
There is a bug filed for the same CSCsf27201. Sometimes even when you are not using multicast traffic ,ARP and CDP packet keep hitting controller CPU and reports this message. Although these packets are dropped when que gets filled but WLC reports this message which will is already resolved in upcoming release.
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WiSM error message : Message: CPU Receive Multicast Queue is full on Controller

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