The number of times that the switch was unable to obtain
a message buffer. Failure to obtain a buffer indicates
that buffers were busy. This parameter is directly
related to hpMsgBufMin. If hpMsgBufMiss is greater than 0,
hpMsgBufMin must equal 0. Conversely, if hpMsgBufMiss
equals 0, then hpMsgBufMin must be greater than 0.