Ports Table

The Ports Table lists each port's performance data. A preview panel displays the historical traffic data of a selected port, such as received packets/data and transmitted packets/data. Data supporting the table and charts are the port counters belonging to the selected node. Use the button on the top-right corner of the ports table to select which port counters fields to display.

Ports Table Data
Option Description
Port # Port number.
LinkQualityIndicator

This is a status indicator, similar to the signal strength bar display on a mobile phone, that enumerates link quality as a range of 0-5, with 5 being very good. Values in the lower part of the range may indicate hardware problems such as port, cable, etc. that surface as signal integrity issues, leading to performance and other problems.

RcvPktsRate Receive Packets Rate in Packets per second (Pps).
RcvDataRate (MBps) Receive Data Rate in Megabytes per second (MBps).
RcvData (MB) Receive Data in Megabytes (MB).
RcvPkts The total number of received fabric data packets.
MulticastRcvPkts The total number of multicast and collective packets received.

This counter includes all valid packets and all packets with a header up to and including the DLID, where the DLID is within the configured range for multicast or collectives. Packets within the configured multicast or collective address space are counted, even if later checks determine the packet is unroutable or exceeds the SwitchInfo.MulticastFDBCap, SwitchInfo.CollectiveFDBCap, configured SwitchInfo.MulticastFDBTop, or configured SwitchInfo.CollectiveFDBTop.

RcvErrors This counter indicates the total number of packets containing an error that were received by the port, including physical errors and malformed packets. It may indicate possible misconfiguration of a port, either by the SM or (more likely) by user intervention (e.g., using a tool such as opaportconfig).
RcvConstraintErrors This counter is incremented when partition key or source LID violations are detected in a received packet, indicating a possible security issue or misconfiguration of device security settings.
RcvSwitchRelayErrors This counter indicates the number of packets that were dropped due to internal routing errors. It is indicative of the possible misconfiguration of a switch by the SM.
RcvRemotePhysicalErrors This counter indicates the number of downstream effects of signal integrity problems. It is indicative of an SI issue in the upstream path.
RcvFECN When a device receives a packet with the FECN (Forward Explicit Congestion Notification) bit set to one, this counter is incremented.
RcvBECN When a device receives a packet with the BECN (Backward Explicit Congestion Notification) bit set to one, this counter is incremented.
RcvBubble This counter indicates the total number of "flit times" where one or more packets have started to be received, but the receiver received idle flits from the wire.
XmitPktsRate Transmitted Packets Rate in Packets per second (Pps).
XmitDataRate (MBps) Transmitted Data Rate in Megabytes per second (MBps).
XmitData (MB) The total number of transmitted fabric data in Megabytes.
XmitPkts The total number of fabric packets transmitted.

This counter includes all fabric packet head flits transmitted with and without errors (such as PktBadHead).

MulticastXmitPkts The total number of multicast and collective packets transmitted
XmitDiscards The number of packets dropped due to one of the following errors:
  • Switch lifetime Limit exceeded
  • Switch head-of-queue lifetime limit exceeded
  • Output port not in active state
  • Packet length exceeded maximum fabric packet size for MTU for VL
  • Flow control disabled and insufficient credits available
  • SC2VL_t mapping invalid for given SC
XmitConstrainErrors This counter is incremented when partition key or source LID violations are detected in a packet attempting to be transmitted, indicating a possible security issue or misconfiguration of device security settings.
XmitWait This counter indicates the amount of time (in "flit times") any virtual lane had data but was unable to transmit (for reasons such as no credits available, or that the link was busy sending non-data packets such as link layer retraining or flow control).
XmitTimeCong This counter indicates the total number of "flit times" that the counter was in a congested state.
XmitWastedBW This counter indicates the number of "flit times" where one or more packets have been started but the transmitters are forced to send idles due to bubbles.
XmitWaitData This counter indicates the number of "flit times" where one or more packets have been started but interrupted due to bubbles in the ingress stream.
LocalLinkIntegrityErrors This counter indicates the number of retries initiated by the link transfer layer. It may be indicative of low signal quality, or may be due to long or low quality cables.
FMConfigErrors This counter indicates inconsistencies of low level SMA configuration on both sides of the link. It is indicative of the possible misconfiguration of a port, either by the SM, or (more likely) by user intervention (by using a tool such as opaportconfig).
ExcessiveBufferOverruns This counter, associated with credit management, indicates an input buffer overrun. It may indicate possible misconfiguration of a port, either by the SM or (more likely) by user intervention (e.g. using a tool such as opaportconfig).
SwPortCongestion This switch-only counter indicates the number of packets that were discarded as unable to transmit due to flow control issues.
MarkFECN This counter indicates the total number of packets that were marked FECN by the transmitter due to congestion.
LinkErrorRecovery This counter indicates the number of times the link has successfully completed the link error recovery process. If LQI is fluctuating toward low values AND this counter is increasing, it may be indicative of a bad link. Indication of a more severe signal quality problem.
LinkDowned This counter indicates the total number of times the port has failed the link error recovery process and downed the link. A large number of occurrences of these events can cause disruptions to fabric traffic.
UncorrectableErrors This counter indicates the number of unrecoverable internal device errors. It is indicative of a severe hardware defect or data corruption on the wire.