[c-nsp] Would millions of TxPause mean my 6500 is too slow?

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I have a 6506 with a Sup2 running in Hybrid (7.6/12.1) mode. It has a
X6548-GE-TX, with many high-bandwidth devices on it. I am not seeing
any interface errors, and nothing but zero's in a 'show asicreg port
pinnacle err', however, I am getting millions (per day) of flowcontrol
TxPause frames on some of my ports.  Does this mean I am overflowing
the (limited) buffers on the 6548 card, or perhaps overworking the sup
itself?

Dal-6506> show port flowcontrol 4/13

Port  Send FlowControl  Receive FlowControl   RxPause    TxPause
      admin    oper     admin     oper
----- -------- -------- --------- ---------   ---------- ----------
 4/13 desired  on       desired   on          0          13826794
Dal-6506> show port flowcontrol 4/16

Port  Send FlowControl  Receive FlowControl   RxPause    TxPause
      admin    oper     admin     oper
----- -------- -------- --------- ---------   ---------- ----------
 4/16 desired  on       desired   on          0          11608252


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