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pkstat
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pkstat [<x>]
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This command displays statistics for all attached packet driver
interfaces.  If a driver supports the GET_STATISTICS command,
more detailed status will be shown. The presence of 'x', which
can be any character, reduces the display to throughput.

Failed RX upcalls:  number of times no buffer space was available
                    to process an interrupt from the pkt driver.

Failed TX requests: number of times the pkt driver refused to
                    accept a packet to be sent.

Other categories displayed, if any, were provided by the packet
driver.

>> Example of output from 'pkstat':
................................................................
Eth0 (Int 0x60):
  Packets in:         0  Out:         0
  Bytes   in:         3  Out:        68
  Errors  in:         0  Out:         0
  Packets lost:  0
  Failed RX upcalls:  0
  Failed TX requests:  1
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>> Example of output from 'pkstat d':
................................................................
  Bytes   in:         6  Out:        46
  Errors  in:         0  Out:         0
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