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==== Device Counters ==== <span id="errors"></span> ===== Errors ===== All dropped or discarded packets MUST be counted. Each stage in a pipeline that can drop packets SHOULD expose a separate drop counter, preferably a counter per each drop reason. At a minimum, these packet counters MUST be present * rx_dropped: aggregate count of packets dropped in the receive pipeline ** excluding those reported as dropped due to host overrun (rx_missed_errors, below). * rx_missed_errors: packets dropped due to insufficient buffer space to store the packet ** Likely due to a slow host that does not keep up with the arrival rate. ** Incast is a significant concern in hyperscale workloads. This is a critical counter. * tx_dropped: aggregate count of packets dropped in the transmit pipeline <span id="rmon"></span> ===== RMON ===== RFC 2819: * histogram statistics - packet counters broken down by packet size ** the [1k, 2k] range SHOULD be broken down into two separate buckets: up to the standard 1518/1522 MTU and above * etherStatsUndersizePkts: packets received that were less than minimum size <span id="mac"></span> ===== MAC ===== IEEE defined: * 30.3.4.2 aPAUSEMACCtrlFramesTransmitted * 30.3.4.3 aPAUSEMACCtrlFramesReceived * additional statistics measuring time spent in paused state are welcome <span id="phy"></span> ===== PHY ===== IEEE defined: * 30.3.2.1.5 aSymbolErrorDuringCarrier * 30.5.1.1.17 aFECCorrectedBlocks * 30.5.1.1.18 aFECUncorrectableBlocks Other: * link_down_events - number of times the link lock was lost or stopped at the PHY level <span id="feature-specific-counters"></span>
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