metrics

Metrics Reference

Linux TCP info metrics

• State: TCP state
• CaState: state of congestion avoidance
• Retransmits: number of retranmissions on timeout invoked
• Probes: consecutive zero window probes that have gone unanswered
• Backoff: used for exponential backoff re-transmission
• Options: number of requesting options
• Rto: tcp re-transmission timeout value, the unit is microsecond
• Ato: ack timeout, unit is microsecond
• SndMss: current maximum segment size
• RcvMss: maximum observed segment size from the remote host
• Unacked: number of unack'd segments
• Sacked: scoreboard segment marked SACKED by sack blocks accounting for the pipe algorithm
• Lost: scoreboard segments marked lost by loss detection heuristics accounting for the pipe algorithm
• Retrans: how many times the retran occurs
• Fackets
• LastDataSent: time since last data segment was sent
• LastAckSent: how long time since the last ack sent
• LastDataRecv: time since last data segment was received
• LastAckRecv: how long time since the last ack received
• Pmtu: path MTU
• RcvSsthresh: tcp congestion window slow start threshold
• Rtt: smoothed round trip time
• Rttvar: RTT variance
• SndSsthresh: slow start threshold
• SndCwnd: congestion window size
• Advmss: advertised maximum segment size
• Reordering: number of reordered segments allowed
• RcvRtt: receiver side RTT estimate
• RcvSpace: space reserved for the receive queue
• TotalRetrans: total number of segments containing retransmitted data
• PacingRate: the pacing rate
• BytesAcked: bytes acked
• BytesReceived: bytes received
• SegsOut: segments sent out
• SegsIn: segments received
• NotsentBytes
• MinRtt
• DataSegsIn: RFC4898 tcpEStatsDataSegsIn
• DataSegsOut: RFC4898 tcpEStatsDataSegsOut
• DeliveryRate
• BusyTime: time (usec) busy sending data
• RwndLimited: time (usec) limited by receive window
• SndbufLimited: time (usec) limited by send buffer
• Delivered
• DeliveredCe
• BytesSent
• BytesRetrans: RFC4898 tcpEStatsPerfOctetsRetrans
• DsackDups: RFC4898 tcpEStatsStackDSACKDups
• ReordSeen: reordering events seen
• RcvOoopack: out-of-order packets received
• SndWnd

Other metrics

• TCPCongesAlg: TCP network congestion-avoidance algorithm
• HTTPStatusCode: HTTP 1xx-5xx status code
• HTTPRcvdBytes: HTTP bytes received
• HTTPRequest: HTTP request, the unit is microsecond
• HTTPResponse: HTTP response, the unit is microsecond
• DNSResolve: domain lookup, the unit is microsecond
• TCPConnect: TCP connect, the unit is microsecond
• TLSHandshake: TLS handshake, the unit is microsecond
• TCPConnectError: total TCP connect error
• DNSResolveError: total DNS resolve error