Statistics Description
Item #1, Good Bytes Transmitted. The firmware counts the number of good bytes transmitted by the card onto the link. In a given packet, applicable bytes subject to counting include the Destination Address field through the Pad field (Preamble, Start of Frame Delimiter, and CRC fields are not counted).
Item #2, Good Bytes Received. The firmware counts the number of bytes received and accepted from the link, that is, subsequent to passing the Address Filter mode set. Applicable bytes subject to counting are from a packet's Destination Address field through the Pad field; also, the packet must not contain any errors.
(Note: This counter is not incremented for self"addressed loopback packets.)
Item #3, Good Packets Transmitted. The firmware counts the number of successful packet transmissions by the card onto the link for which there were no errors. This value is related to Item #1 above.
Item #4, Good Packets Received. The firmware counts the number of packets that are received and pass the Address Filter mode configured on the card. The packet must not contain any errors. This value is related to Item #2 above.
(Note: This counter is not incremented for self"addressed loopback packets.)
Item #5, Errors on Transmit. This statistic is incremented for each packet that experiences at least one error during transmission. Although a single packet may experience several transmission errors, this statistic would be incremented only by one.
(Note: for MAUs that do not return a heartbeat signal, this statistic will be incremented on every transmission. See Item #8 below.)
Item #6, Errors on Receive. This statistic reflects the total number of packets received that pass the Address Filter mode set on the card, but contain one or more receive errors.
Item #7, Babble Errors. This statistic is incremented by the firmware whenever the Link Controller chip detects a transmit packet that exceeds the allowed packet length (greater than 1518 bytes, not counting the Preamble and Start of Frame Delimiter fields).
Item #8, Heartbeat Errors. Typically, IEEE 802.3 MAUs will return a short signal (heartbeat) to the LANIC card after each transmission to indicate proper operation of collision detect circuitry. This counter is incremented on each transmission that does not return a heartbeat.
Item #9, Missed Packets Due to No Receive Buffers. Before Packet Filter mode processing, this counter is incremented when there is no receive buffer space available in RAM to place the packet, hence the packet is lost.
Item #10, Card Memory Errors. During packet transmission or reception, card RAM must be accessed. The firmware increments this counter when an error occurs during access of the card memory system.
Item #11, Framing Errors. This statistic reflects the number of packets received that do not contain an integral number of bytes, which invalidates the packet.
Item #12, Packets Discarded by the Driver. This statistic is incremented whenever the driver requests that a packet be discarded. This occurs on orphan packets when the node is configured for discarding orphans. In addition, the driver may cause packet discard of good packets if system or other resources are not available (for example, insufficient SAM).
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