- TCP INFO Schema
- Changelog
- Data Annotations
- Examples & Guidance on Using TCP_INFO
- Citing the M-Lab TCP INFO Dataset
schema, changelog, data annotations, examples & guidance on how to use, citation info
TCP INFO Schema
Note: The tcpinfo schema has not yet been migrated to standard columns. Until that time, this schema should be considered temporary or unstable.
| Field name | Type | Description |
|---|---|---|
| UUID | STRING | |
| TestTime | TIMESTAMP | |
| ClientASN | INTEGER | |
| ServerASN | INTEGER | |
| ParseInfo | RECORD | Metadata about how the parser processed the measurement. |
| ParseInfo.TaskFileName | STRING | GCS URL to the archive containing the test_id for this row. |
| ParseInfo.ParseTime | TIMESTAMP | Time that the parser processed this row. |
| ParseInfo.ParserVersion | STRING | Version of the parser that processed this row. |
| ParseInfo.Filename | STRING | |
| SockID | RECORD | |
| SockID.SPort | INTEGER | |
| SockID.DPort | INTEGER | |
| SockID.SrcIP | STRING | |
| SockID.DstIP | STRING | |
| SockID.Interface | INTEGER | |
| SockID.Cookie | INTEGER | |
| Server | RECORD | |
| Server.IP | STRING | |
| Server.Port | INTEGER | |
| Server.IATA | STRING | |
| Server.Geo | RECORD | |
| Server.Geo.continent_code | STRING | |
| Server.Geo.country_code | STRING | |
| Server.Geo.country_code3 | STRING | |
| Server.Geo.country_name | STRING | |
| Server.Geo.region | STRING | |
| Server.Geo.metro_code | INTEGER | |
| Server.Geo.city | STRING | |
| Server.Geo.area_code | INTEGER | |
| Server.Geo.postal_code | STRING | |
| Server.Geo.latitude | FLOAT | |
| Server.Geo.longitude | FLOAT | |
| Server.Geo.radius | INTEGER | |
| Server.Network | RECORD | Network information about connection. |
| Server.Network.IPPrefix | STRING | |
| Server.Network.Systems | RECORD | |
| Server.Network.Systems.ASNs | INTEGER | |
| Client | RECORD | |
| Client.IP | STRING | |
| Client.Port | INTEGER | |
| Client.Geo | RECORD | |
| Client.Geo.continent_code | STRING | |
| Client.Geo.country_code | STRING | |
| Client.Geo.country_code3 | STRING | |
| Client.Geo.country_name | STRING | |
| Client.Geo.region | STRING | |
| Client.Geo.metro_code | INTEGER | |
| Client.Geo.city | STRING | |
| Client.Geo.area_code | INTEGER | |
| Client.Geo.postal_code | STRING | |
| Client.Geo.latitude | FLOAT | |
| Client.Geo.longitude | FLOAT | |
| Client.Geo.radius | INTEGER | |
| Client.Network | RECORD | Network information about connection. |
| Client.Network.IPPrefix | STRING | |
| Client.Network.Systems | RECORD | |
| Client.Network.Systems.ASNs | INTEGER | |
| FinalSnapshot | RECORD | |
| FinalSnapshot.Timestamp | TIMESTAMP | |
| FinalSnapshot.Observed | INTEGER | |
| FinalSnapshot.NotFullyParsed | INTEGER | |
| FinalSnapshot.InetDiagMsg | RECORD | |
| FinalSnapshot.InetDiagMsg.IDiagFamily | INTEGER | |
| FinalSnapshot.InetDiagMsg.IDiagState | INTEGER | |
| FinalSnapshot.InetDiagMsg.IDiagTimer | INTEGER | |
| FinalSnapshot.InetDiagMsg.IDiagRetrans | INTEGER | |
| FinalSnapshot.InetDiagMsg.IDiagExpires | INTEGER | |
| FinalSnapshot.InetDiagMsg.IDiagRqueue | INTEGER | |
| FinalSnapshot.InetDiagMsg.IDiagWqueue | INTEGER | |
| FinalSnapshot.InetDiagMsg.IDiagUID | INTEGER | |
| FinalSnapshot.InetDiagMsg.IDiagInode | INTEGER | |
| FinalSnapshot.CongestionAlgorithm | STRING | |
| FinalSnapshot.TOS | INTEGER | |
| FinalSnapshot.TClass | INTEGER | |
| FinalSnapshot.ClassID | INTEGER | |
| FinalSnapshot.Shutdown | INTEGER | |
| FinalSnapshot.Protocol | INTEGER | |
| FinalSnapshot.Mark | INTEGER | |
| FinalSnapshot.TCPInfo | RECORD | Results from getsockopt(..TCP_INFO..) |
| FinalSnapshot.TCPInfo.State | INTEGER | TCP State In MLab data TCP state is nominally 1 (Established). Other values reflect transient states having incomplete rows. Kernel: See TCP_ESTABLISHED in include/net/tcp_states.h |
| FinalSnapshot.TCPInfo.CAState | INTEGER | Loss recovery state machine For traditional loss based congestion control algorithms, CAState is also used to control window adjustments. Kernel: tcp_set_ca_state in include/net/tcp.h |
| FinalSnapshot.TCPInfo.Retransmits | INTEGER | Number of timeouts (RTO based retransmissions) at this sequence. Reset to zero on forward progress Kernel: icsk_retransmits in include/net/inet_connection_sock.h |
| FinalSnapshot.TCPInfo.Probes | INTEGER | Consecutive zero window probes that have gone unanswered Kernel: icsk_probes_out in include/net/inet_connection_sock.h |
| FinalSnapshot.TCPInfo.Backoff | INTEGER | Exponential timeout backoff counter Increment on RTO, reset on successful RTT measurements. Kernel: icsk_backoff in include/net/inet_connection_sock.h |
| FinalSnapshot.TCPInfo.Options | INTEGER | Bit encoded SYN options and other negotiations TIMESTAMPS 0x1; SACK 0x2; WSCALE 0x4; ECN 0x8 - Was negotiated; ECN_SEEN - At least one ECT seen; SYN_DATA - SYN-ACK acknowledged data in SYN sent or rcvd Kernel: TCPI_OPT_TIMESTAMPS in include/uapi/linux/tcp.h |
| FinalSnapshot.TCPInfo.WScale | INTEGER | BUG Conflation of SndWScale and RcvWScale See github.com/m-lab/etl/issues/790 |
| FinalSnapshot.TCPInfo.AppLimited | INTEGER | Flag indicating that rate measurements reflect non-network bottlenecks Note that even very short application stalls invalidate max_BW measurements. Kernel: rate_app_limited in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.RTO | INTEGER | Retransmission Timeout Quantized to system jiffies Kernel: icsk_rto in include/net/inet_connection_sock.h |
| FinalSnapshot.TCPInfo.ATO | INTEGER | Delayed ACK Timeout Quantized to system jiffies Kernel: ato in icsk_ack in include/net/inet_connection_sock.h |
| FinalSnapshot.TCPInfo.SndMSS | INTEGER | Current Maximum Segment Size Note that this can be smaller than the negotiated MSS for various reasons Kernel: mss_cache in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.RcvMSS | INTEGER | Maximum observed segment size from the remote host Used to trigger delayed ACKs Kernel: rcv_mss in icsk_ack in include/net/inet_connection_sock.h |
| FinalSnapshot.TCPInfo.Unacked | INTEGER | Number of segments between snd.nxt and snd.una Accounting for the Pipe algorithm Kernel: packets_out in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.Sacked | INTEGER | Scoreboard segment marked SACKED by sack blocks Accounting for the Pipe algorithm Kernel: sacked_out in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.Lost | INTEGER | Scoreboard segments marked lost by loss detection heuristics Accounting for the Pipe algorithm Kernel: lost_out in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.Retrans | INTEGER | Scoreboard segments marked retransmitted Accounting for the Pipe algorithm Kernel: retrans_out in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.Fackets | INTEGER | Unused Kernel: tcpi_fackets in include/uapi/linux/tcp.h |
| FinalSnapshot.TCPInfo.LastDataSent | INTEGER | Time since last data segment was sent Quantized to jiffies Kernel: lsndtime in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.LastAckSent | INTEGER | Time since last ACK was sent (Not implemented) Present in TCP_INFO but not elsewhere in the kernel |
| FinalSnapshot.TCPInfo.LastDataRecv | INTEGER | Time since last data segment was received Quantized to jiffies Kernel: lrcvtime in icsk_ack in include/net/inet_connection_sock.h |
| FinalSnapshot.TCPInfo.LastAckRecv | INTEGER | Time since last ACK was received Quantized to jiffies Kernel: rcv_tstamp in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.PMTU | INTEGER | Maximum IP Transmission Unit for this path Kernel: icsk_pmtu_cookie in include/net/inet_connection_sock.h |
| FinalSnapshot.TCPInfo.RcvSsThresh | INTEGER | Current Window Clamp Receiver algorithm to avoid allocating excessive receive buffers Kernel: rcv_ssthresh in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.RTT | INTEGER | Smoothed Round Trip Time (RTT) The Linux implementation differs from the standard Kernel: srtt_us in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.RTTVar | INTEGER | RTT variance The Linux implementation differs from the standard Kernel: mdev_us in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.SndSsThresh | INTEGER | Slow Start Threshold Value controlled by the selected congestion control algorithm Kernel: snd_ssthresh in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.SndCwnd | INTEGER | Congestion Window Value controlled by the selected congestion control algorithm Kernel: snd_cwnd in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.AdvMSS | INTEGER | Advertised MSS Kernel: advmss in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.Reordering | INTEGER | Maximum observed reordering distance Kernel: reordering in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.RcvRTT | INTEGER | Receiver Side RTT estimate Kernel: rcv_rtt_est.rtt_us in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.RcvSpace | INTEGER | Space reserved for the receive queue Typically updated by receiver side auto-tuning Kernel: space in rcvq_space in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.TotalRetrans | INTEGER | Total number of segments containing retransmitted data Kernel: total_retrans in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.PacingRate | INTEGER | Current Pacing Rate, nominally updated by congestion control Kernel: sk_pacing_rate in include/net/sock.h |
| FinalSnapshot.TCPInfo.MaxPacingRate | INTEGER | Settable pacing rate clamp Set with setsockopt( ..SO_MAX_PACING_RATE.. ) Kernel: sk_max_pacing_rate in include/net/sock.h |
| FinalSnapshot.TCPInfo.BytesAcked | INTEGER | The number of data bytes for which cumulative acknowledgments have been received Kernel: bytes_acked in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.BytesReceived | INTEGER | The number of data bytes for which have been received Kernel: bytes_received in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.SegsOut | INTEGER | The number of segments transmitted Includes data and pure ACKs Kernel: segs_out in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.SegsIn | INTEGER | The number of segments received Includes data and pure ACKs Kernel: segs_in in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.NotsentBytes | INTEGER | Number of bytes queued in the send buffer that have not been sent Kernel: tcpi_notsent_bytes() in net/ipv4/tcp.c |
| FinalSnapshot.TCPInfo.MinRTT | INTEGER | Minimum RTT From an older, pre-BBR algorithm Kernel: tcp_min_rtt in include/net/tcp.h |
| FinalSnapshot.TCPInfo.DataSegsIn | INTEGER | Input segments carrying data (len>0) Kernel: data_segs_in in include/net/tcp.h |
| FinalSnapshot.TCPInfo.DataSegsOut | INTEGER | Transmitted segments carrying data (len>0) Kernel: data_segs_out in include/net/tcp.h |
| FinalSnapshot.TCPInfo.DeliveryRate | INTEGER | Observed Maximum Delivery Rate Kernel: tcp_compute_delivery_rate() in net/ipv4/tcp.c |
| FinalSnapshot.TCPInfo.BusyTime | INTEGER | Time with outstanding (unacknowledged) data Time when snd.una not equal to snd.next Kernel: tcp_get_info_chrono_stats() in net/ipv4/tcp.c |
| FinalSnapshot.TCPInfo.RWndLimited | INTEGER | Time spend waiting for receiver window Kernel: tcp_get_info_chrono_stats() in net/ipv4/tcp.c |
| FinalSnapshot.TCPInfo.SndBufLimited | INTEGER | Time spend waiting for sender buffer space This only includes the time when TCP transmissions are starved for data, but the application has been stopped because the buffer is full and can not be grown for some reason. Kernel: tcp_get_info_chrono_stats() in net/ipv4/tcp.c |
| FinalSnapshot.TCPInfo.Delivered | INTEGER | Data segments delivered to the receiver including retransmits As reported by returning ACKs, used by ECN Kernel: delivered in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.DeliveredCE | INTEGER | ECE marked data segments delivered to the receiver including retransmits As reported by returning ACKs, used by ECN Kernel: delivered_ce in include/linux/tcp.h |
| FinalSnapshot.TCPInfo.BytesSent | INTEGER | Payload bytes sent (excludes headers, includes retransmissions) Kernel: bytes_sent |
| FinalSnapshot.TCPInfo.BytesRetrans | INTEGER | Bytes retransmitted May include headers and new data carried with a retransmission (for thin flows). Kernel: bytes_retrans |
| FinalSnapshot.TCPInfo.DSackDups | INTEGER | Duplicate segments reported by DSACK Not reported by some OS Kernel: dsack_dups |
| FinalSnapshot.TCPInfo.ReordSeen | INTEGER | Received ACKs that were out of order Estimates reordering on the return path Kernel: reord_seen |
| FinalSnapshot.MemInfo | RECORD | |
| FinalSnapshot.MemInfo.Rmem | INTEGER | |
| FinalSnapshot.MemInfo.Wmem | INTEGER | |
| FinalSnapshot.MemInfo.Fmem | INTEGER | |
| FinalSnapshot.MemInfo.Tmem | INTEGER | |
| FinalSnapshot.SocketMem | RECORD | |
| FinalSnapshot.SocketMem.RmemAlloc | INTEGER | |
| FinalSnapshot.SocketMem.Rcvbuf | INTEGER | |
| FinalSnapshot.SocketMem.WmemAlloc | INTEGER | |
| FinalSnapshot.SocketMem.Sndbuf | INTEGER | |
| FinalSnapshot.SocketMem.FwdAlloc | INTEGER | |
| FinalSnapshot.SocketMem.WmemQueued | INTEGER | |
| FinalSnapshot.SocketMem.Optmem | INTEGER | |
| FinalSnapshot.SocketMem.Backlog | INTEGER | |
| FinalSnapshot.SocketMem.Drops | INTEGER | |
| FinalSnapshot.VegasInfo | RECORD | Instrumntation in Vegas TCP Not used by M-Lab |
| FinalSnapshot.VegasInfo.Enabled | INTEGER | |
| FinalSnapshot.VegasInfo.RTTCount | INTEGER | |
| FinalSnapshot.VegasInfo.RTT | INTEGER | |
| FinalSnapshot.VegasInfo.MinRTT | INTEGER | |
| FinalSnapshot.DCTCPInfo | RECORD | Instrumentation in DCTCP Not used by M-Lab |
| FinalSnapshot.DCTCPInfo.Enabled | INTEGER | |
| FinalSnapshot.DCTCPInfo.CEState | INTEGER | |
| FinalSnapshot.DCTCPInfo.Alpha | INTEGER | |
| FinalSnapshot.DCTCPInfo.ABEcn | INTEGER | |
| FinalSnapshot.DCTCPInfo.ABTot | INTEGER | |
| FinalSnapshot.BBRInfo | RECORD | Instrumentation in the BBR TCP module in the kernel. |
| FinalSnapshot.BBRInfo.BW | INTEGER | The maximum end-to-end bandwidth from the server to the client as measured by BBR. |
| FinalSnapshot.BBRInfo.MinRTT | INTEGER | The minimum round trip time as measured by BBR. |
| FinalSnapshot.BBRInfo.PacingGain | INTEGER | Fixed point multiplier used to set the pacing rate from the maximum bandwidth. The binary point varies by kernel version but the statistical mode is always 1.0. |
| FinalSnapshot.BBRInfo.CwndGain | INTEGER | Fixed point multiplier used to set the maximum window size from BW*MinRTT. |
| Snapshots | RECORD | |
| Snapshots.Timestamp | TIMESTAMP | |
| Snapshots.Observed | INTEGER | |
| Snapshots.NotFullyParsed | INTEGER | |
| Snapshots.InetDiagMsg | RECORD | |
| Snapshots.InetDiagMsg.IDiagFamily | INTEGER | |
| Snapshots.InetDiagMsg.IDiagState | INTEGER | |
| Snapshots.InetDiagMsg.IDiagTimer | INTEGER | |
| Snapshots.InetDiagMsg.IDiagRetrans | INTEGER | |
| Snapshots.InetDiagMsg.IDiagExpires | INTEGER | |
| Snapshots.InetDiagMsg.IDiagRqueue | INTEGER | |
| Snapshots.InetDiagMsg.IDiagWqueue | INTEGER | |
| Snapshots.InetDiagMsg.IDiagUID | INTEGER | |
| Snapshots.InetDiagMsg.IDiagInode | INTEGER | |
| Snapshots.CongestionAlgorithm | STRING | |
| Snapshots.TOS | INTEGER | |
| Snapshots.TClass | INTEGER | |
| Snapshots.ClassID | INTEGER | |
| Snapshots.Shutdown | INTEGER | |
| Snapshots.Protocol | INTEGER | |
| Snapshots.Mark | INTEGER | |
| Snapshots.TCPInfo | RECORD | Results from getsockopt(..TCP_INFO..) |
| Snapshots.TCPInfo.State | INTEGER | TCP State In MLab data TCP state is nominally 1 (Established). Other values reflect transient states having incomplete rows. Kernel: See TCP_ESTABLISHED in include/net/tcp_states.h |
| Snapshots.TCPInfo.CAState | INTEGER | Loss recovery state machine For traditional loss based congestion control algorithms, CAState is also used to control window adjustments. Kernel: tcp_set_ca_state in include/net/tcp.h |
| Snapshots.TCPInfo.Retransmits | INTEGER | Number of timeouts (RTO based retransmissions) at this sequence. Reset to zero on forward progress Kernel: icsk_retransmits in include/net/inet_connection_sock.h |
| Snapshots.TCPInfo.Probes | INTEGER | Consecutive zero window probes that have gone unanswered Kernel: icsk_probes_out in include/net/inet_connection_sock.h |
| Snapshots.TCPInfo.Backoff | INTEGER | Exponential timeout backoff counter Increment on RTO, reset on successful RTT measurements. Kernel: icsk_backoff in include/net/inet_connection_sock.h |
| Snapshots.TCPInfo.Options | INTEGER | Bit encoded SYN options and other negotiations TIMESTAMPS 0x1; SACK 0x2; WSCALE 0x4; ECN 0x8 - Was negotiated; ECN_SEEN - At least one ECT seen; SYN_DATA - SYN-ACK acknowledged data in SYN sent or rcvd Kernel: TCPI_OPT_TIMESTAMPS in include/uapi/linux/tcp.h |
| Snapshots.TCPInfo.WScale | INTEGER | BUG Conflation of SndWScale and RcvWScale See github.com/m-lab/etl/issues/790 |
| Snapshots.TCPInfo.AppLimited | INTEGER | Flag indicating that rate measurements reflect non-network bottlenecks Note that even very short application stalls invalidate max_BW measurements. Kernel: rate_app_limited in include/linux/tcp.h |
| Snapshots.TCPInfo.RTO | INTEGER | Retransmission Timeout Quantized to system jiffies Kernel: icsk_rto in include/net/inet_connection_sock.h |
| Snapshots.TCPInfo.ATO | INTEGER | Delayed ACK Timeout Quantized to system jiffies Kernel: ato in icsk_ack in include/net/inet_connection_sock.h |
| Snapshots.TCPInfo.SndMSS | INTEGER | Current Maximum Segment Size Note that this can be smaller than the negotiated MSS for various reasons Kernel: mss_cache in include/linux/tcp.h |
| Snapshots.TCPInfo.RcvMSS | INTEGER | Maximum observed segment size from the remote host Used to trigger delayed ACKs Kernel: rcv_mss in icsk_ack in include/net/inet_connection_sock.h |
| Snapshots.TCPInfo.Unacked | INTEGER | Number of segments between snd.nxt and snd.una Accounting for the Pipe algorithm Kernel: packets_out in include/linux/tcp.h |
| Snapshots.TCPInfo.Sacked | INTEGER | Scoreboard segment marked SACKED by sack blocks Accounting for the Pipe algorithm Kernel: sacked_out in include/linux/tcp.h |
| Snapshots.TCPInfo.Lost | INTEGER | Scoreboard segments marked lost by loss detection heuristics Accounting for the Pipe algorithm Kernel: lost_out in include/linux/tcp.h |
| Snapshots.TCPInfo.Retrans | INTEGER | Scoreboard segments marked retransmitted Accounting for the Pipe algorithm Kernel: retrans_out in include/linux/tcp.h |
| Snapshots.TCPInfo.Fackets | INTEGER | Unused Kernel: tcpi_fackets in include/uapi/linux/tcp.h |
| Snapshots.TCPInfo.LastDataSent | INTEGER | Time since last data segment was sent Quantized to jiffies Kernel: lsndtime in include/linux/tcp.h |
| Snapshots.TCPInfo.LastAckSent | INTEGER | Time since last ACK was sent (Not implemented) Present in TCP_INFO but not elsewhere in the kernel |
| Snapshots.TCPInfo.LastDataRecv | INTEGER | Time since last data segment was received Quantized to jiffies Kernel: lrcvtime in icsk_ack in include/net/inet_connection_sock.h |
| Snapshots.TCPInfo.LastAckRecv | INTEGER | Time since last ACK was received Quantized to jiffies Kernel: rcv_tstamp in include/linux/tcp.h |
| Snapshots.TCPInfo.PMTU | INTEGER | Maximum IP Transmission Unit for this path Kernel: icsk_pmtu_cookie in include/net/inet_connection_sock.h |
| Snapshots.TCPInfo.RcvSsThresh | INTEGER | Current Window Clamp Receiver algorithm to avoid allocating excessive receive buffers Kernel: rcv_ssthresh in include/linux/tcp.h |
| Snapshots.TCPInfo.RTT | INTEGER | Smoothed Round Trip Time (RTT) The Linux implementation differs from the standard Kernel: srtt_us in include/linux/tcp.h |
| Snapshots.TCPInfo.RTTVar | INTEGER | RTT variance The Linux implementation differs from the standard Kernel: mdev_us in include/linux/tcp.h |
| Snapshots.TCPInfo.SndSsThresh | INTEGER | Slow Start Threshold Value controlled by the selected congestion control algorithm Kernel: snd_ssthresh in include/linux/tcp.h |
| Snapshots.TCPInfo.SndCwnd | INTEGER | Congestion Window Value controlled by the selected congestion control algorithm Kernel: snd_cwnd in include/linux/tcp.h |
| Snapshots.TCPInfo.AdvMSS | INTEGER | Advertised MSS Kernel: advmss in include/linux/tcp.h |
| Snapshots.TCPInfo.Reordering | INTEGER | Maximum observed reordering distance Kernel: reordering in include/linux/tcp.h |
| Snapshots.TCPInfo.RcvRTT | INTEGER | Receiver Side RTT estimate Kernel: rcv_rtt_est.rtt_us in include/linux/tcp.h |
| Snapshots.TCPInfo.RcvSpace | INTEGER | Space reserved for the receive queue Typically updated by receiver side auto-tuning Kernel: space in rcvq_space in include/linux/tcp.h |
| Snapshots.TCPInfo.TotalRetrans | INTEGER | Total number of segments containing retransmitted data Kernel: total_retrans in include/linux/tcp.h |
| Snapshots.TCPInfo.PacingRate | INTEGER | Current Pacing Rate, nominally updated by congestion control Kernel: sk_pacing_rate in include/net/sock.h |
| Snapshots.TCPInfo.MaxPacingRate | INTEGER | Settable pacing rate clamp Set with setsockopt( ..SO_MAX_PACING_RATE.. ) Kernel: sk_max_pacing_rate in include/net/sock.h |
| Snapshots.TCPInfo.BytesAcked | INTEGER | The number of data bytes for which cumulative acknowledgments have been received Kernel: bytes_acked in include/linux/tcp.h |
| Snapshots.TCPInfo.BytesReceived | INTEGER | The number of data bytes for which have been received Kernel: bytes_received in include/linux/tcp.h |
| Snapshots.TCPInfo.SegsOut | INTEGER | The number of segments transmitted Includes data and pure ACKs Kernel: segs_out in include/linux/tcp.h |
| Snapshots.TCPInfo.SegsIn | INTEGER | The number of segments received Includes data and pure ACKs Kernel: segs_in in include/linux/tcp.h |
| Snapshots.TCPInfo.NotsentBytes | INTEGER | Number of bytes queued in the send buffer that have not been sent Kernel: tcpi_notsent_bytes() in net/ipv4/tcp.c |
| Snapshots.TCPInfo.MinRTT | INTEGER | Minimum RTT From an older, pre-BBR algorithm Kernel: tcp_min_rtt in include/net/tcp.h |
| Snapshots.TCPInfo.DataSegsIn | INTEGER | Input segments carrying data (len>0) Kernel: data_segs_in in include/net/tcp.h |
| Snapshots.TCPInfo.DataSegsOut | INTEGER | Transmitted segments carrying data (len>0) Kernel: data_segs_out in include/net/tcp.h |
| Snapshots.TCPInfo.DeliveryRate | INTEGER | Observed Maximum Delivery Rate Kernel: tcp_compute_delivery_rate() in net/ipv4/tcp.c |
| Snapshots.TCPInfo.BusyTime | INTEGER | Time with outstanding (unacknowledged) data Time when snd.una not equal to snd.next Kernel: tcp_get_info_chrono_stats() in net/ipv4/tcp.c |
| Snapshots.TCPInfo.RWndLimited | INTEGER | Time spend waiting for receiver window Kernel: tcp_get_info_chrono_stats() in net/ipv4/tcp.c |
| Snapshots.TCPInfo.SndBufLimited | INTEGER | Time spend waiting for sender buffer space This only includes the time when TCP transmissions are starved for data, but the application has been stopped because the buffer is full and can not be grown for some reason. Kernel: tcp_get_info_chrono_stats() in net/ipv4/tcp.c |
| Snapshots.TCPInfo.Delivered | INTEGER | Data segments delivered to the receiver including retransmits As reported by returning ACKs, used by ECN Kernel: delivered in include/linux/tcp.h |
| Snapshots.TCPInfo.DeliveredCE | INTEGER | ECE marked data segments delivered to the receiver including retransmits As reported by returning ACKs, used by ECN Kernel: delivered_ce in include/linux/tcp.h |
| Snapshots.TCPInfo.BytesSent | INTEGER | Payload bytes sent (excludes headers, includes retransmissions) Kernel: bytes_sent |
| Snapshots.TCPInfo.BytesRetrans | INTEGER | Bytes retransmitted May include headers and new data carried with a retransmission (for thin flows). Kernel: bytes_retrans |
| Snapshots.TCPInfo.DSackDups | INTEGER | Duplicate segments reported by DSACK Not reported by some OS Kernel: dsack_dups |
| Snapshots.TCPInfo.ReordSeen | INTEGER | Received ACKs that were out of order Estimates reordering on the return path Kernel: reord_seen |
| Snapshots.MemInfo | RECORD | |
| Snapshots.MemInfo.Rmem | INTEGER | |
| Snapshots.MemInfo.Wmem | INTEGER | |
| Snapshots.MemInfo.Fmem | INTEGER | |
| Snapshots.MemInfo.Tmem | INTEGER | |
| Snapshots.SocketMem | RECORD | |
| Snapshots.SocketMem.RmemAlloc | INTEGER | |
| Snapshots.SocketMem.Rcvbuf | INTEGER | |
| Snapshots.SocketMem.WmemAlloc | INTEGER | |
| Snapshots.SocketMem.Sndbuf | INTEGER | |
| Snapshots.SocketMem.FwdAlloc | INTEGER | |
| Snapshots.SocketMem.WmemQueued | INTEGER | |
| Snapshots.SocketMem.Optmem | INTEGER | |
| Snapshots.SocketMem.Backlog | INTEGER | |
| Snapshots.SocketMem.Drops | INTEGER | |
| Snapshots.VegasInfo | RECORD | Instrumntation in Vegas TCP Not used by M-Lab |
| Snapshots.VegasInfo.Enabled | INTEGER | |
| Snapshots.VegasInfo.RTTCount | INTEGER | |
| Snapshots.VegasInfo.RTT | INTEGER | |
| Snapshots.VegasInfo.MinRTT | INTEGER | |
| Snapshots.DCTCPInfo | RECORD | Instrumentation in DCTCP Not used by M-Lab |
| Snapshots.DCTCPInfo.Enabled | INTEGER | |
| Snapshots.DCTCPInfo.CEState | INTEGER | |
| Snapshots.DCTCPInfo.Alpha | INTEGER | |
| Snapshots.DCTCPInfo.ABEcn | INTEGER | |
| Snapshots.DCTCPInfo.ABTot | INTEGER | |
| Snapshots.BBRInfo | RECORD | Instrumentation in the BBR TCP module in the kernel. |
| Snapshots.BBRInfo.BW | INTEGER | The maximum end-to-end bandwidth from the server to the client as measured by BBR. |
| Snapshots.BBRInfo.MinRTT | INTEGER | The minimum round trip time as measured by BBR. |
| Snapshots.BBRInfo.PacingGain | INTEGER | Fixed point multiplier used to set the pacing rate from the maximum bandwidth. The binary point varies by kernel version but the statistical mode is always 1.0. |
| Snapshots.BBRInfo.CwndGain | INTEGER | Fixed point multiplier used to set the maximum window size from BW*MinRTT. |
Changelog
Data Annotations
Examples & Guidance on Using TCP_INFO
Citing the M-Lab TCP INFO Dataset
Please cite this data set as follows: The M-Lab TCP INFO Data Set, <date range used>. https://measurementlab.net/tests/tcp-info