CPU buffer pools are named as RxQ0 to RxQ15 The switches have 16 different CPU queues for different types traffic each queue can only send a certain amount of traffic to the CPU. The port asic will drop the rest an overload on one queue should not cause problems for the other queues.
To see what packets are located in the buffers use the
show buffer command
In your case RxQ15 is increasing the buffer means can you check the cpu utilization of the switch.
I have had the same problem.... The fix for me was to disable QoS. Our application performance went down so far we could barely use our internet connection. Turning off QoS increased the packet buffers to one pool thus higher throughput.
In addition setup an etherchannel to the highly utilized up-links to other switches and to your servers.
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