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collectors TCPCollector
Rob Smith edited this page Dec 21, 2012
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15 revisions
The TCPCollector class collects metrics on TCP stats
- /proc/net/netstat
- /proc/net/snmp
| Name | Description |
|---|---|
| SyncookiesSent | An application wasn't able to accept a connection fast enough, so the kernel couldn't store an entry in the queue for this connection. Instead of dropping it, it sent a cookie to the client. |
| SyncookiesRecv | After sending a cookie, it came back to us and passed the check. |
| SyncookiesFailed | After sending a cookie, it came back to us but looked invalid. |
| EmbryonicRsts | |
| PruneCalled | |
| RcvPruned | If the kernel is really really desperate and cannot give more memory to this socket even after dropping the ofo queue, it will simply discard the packet it received. This is Really Bad. |
| OfoPruned | When a socket is using too much memory (rmem), the kernel will first discard any out-of-order packet that has been queued (with SACK). |
| OutOfWindowIcmps | |
| LockDroppedIcmps | |
| ArpFilter | |
| TW | |
| TWRecycled | |
| TWKilled | |
| PAWSPassive | |
| PAWSActive | |
| PAWSEstab | |
| DelayedACKs | We waited for another packet to send an ACK, but didn't see any, so a timer ended up sending a delayed ACK. |
| DelayedACKLocked | We wanted to send a delayed ACK but failed because the socket was locked. So the timer was reset. |
| DelayedACKLost | We sent a delayed and duplicated ACK because the remote peer retransmitted a packet, thinking that it didn't get to us. |
| ListenOverflows | We completed a 3WHS but couldn't put the socket on the accept queue, so we had to discard the connection. |
| ListenDrops | We couldn't accept a connection because one of: we had no route to the destination, we failed to allocate a socket, we failed to allocate a new local port bind bucket. Note: this counter also include all the increments made to ListenOverflows |
| TCPPrequeued | |
| TCPDirectCopyFromBacklog | |
| TCPDirectCopyFromPrequeue | |
| TCPPrequeueDropped | |
| TCPHPHits | |
| TCPHPHitsToUser | |
| TCPPureAcks | |
| TCPHPAcks | |
| TCPRenoRecovery | A packet was lost and we recovered after a fast retransmit. |
| TCPSackRecovery | A packet was lost and we recovered by using selective acknowledgements. |
| TCPSACKReneging | |
| TCPFACKReorder | We detected re-ordering using FACK (Forward ACK -- the highest sequence number known to have been received by the peer when using SACK -- FACK is used during congestion control). |
| TCPSACKReorder | We detected re-ordering using SACK. |
| TCPRenoReorder | We detected re-ordering using fast retransmit. |
| TCPTSReorder | We detected re-ordering using the timestamp option. |
| TCPFullUndo | We detected some erroneous retransmits and undid our CWND reduction. |
| TCPPartialUndo | We detected some erroneous retransmits, a partial ACK arrived while we were fast retransmitting, so we were able to partially undo some of our CWND reduction. |
| TCPDSACKUndo | We detected some erroneous retransmits, a D-SACK arrived and ACK'ed all the retransmitted data, so we undid our CWND reduction. |
| TCPLossUndo | We detected some erroneous retransmits, a partial ACK arrived, so we undid our CWND reduction. |
| TCPLoss | |
| TCPLostRetransmit | |
| TCPRenoFailures | |
| TCPSackFailures | |
| TCPLossFailures | |
| TCPFastRetrans | |
| TCPForwardRetrans | |
| TCPSlowStartRetrans | |
| TCPTimeouts | |
| TCPRenoRecoveryFail | |
| TCPSackRecoveryFail | |
| TCPSchedulerFailed | |
| TCPRcvCollapsed | |
| TCPDSACKOldSent | |
| TCPDSACKOfoSent | |
| TCPDSACKRecv | |
| TCPDSACKOfoRecv | |
| TCPSACKDiscard | We got a completely invalid SACK block and discarded it. |
| TCPDSACKIgnoredOld | We got a duplicate SACK while retransmitting so we discarded it. |
| TCPDSACKIgnoredNoUndo | We got a duplicate SACK and discarded it. |
| TCPAbortOnSyn | We received an unexpected SYN so we sent a RST to the peer. |
| TCPAbortOnData | We were in FIN_WAIT1 yet we received a data packet with a sequence number that's beyond the last one for this connection, so we RST'ed. |
| TCPAbortOnClose | We received data but the user has closed the socket, so we have no wait of handing it to them, so we RST'ed. |
| TCPAbortOnMemory | This is Really Bad. It happens when there are too many orphaned sockets (not attached a FD) and the kernel has to drop a connection. Sometimes it will send a reset to the peer, sometimes it wont. |
| TCPAbortOnTimeout | The connection timed out really hard. |
| TCPAbortOnLinger | We killed a socket that was closed by the application and lingered around for long enough. |
| TCPAbortFailed | We tried to send a reset, probably during one of teh TCPABort* situations above, but we failed e.g. because we couldn't allocate enough memory (very bad). |
| TCPMemoryPressures | Number of times a socket was put in "memory pressure" due to a non fatal memory allocation failure (reduces the send buffer size etc). |
| TCPBacklogDrop | We received something but had to drop it because the socket's receive queue was full. |
| RtoAlgorithm | |
| RtoMin | |
| RtoMax | |
| MaxConn | |
| ActiveOpens | |
| PassiveOpens | |
| AttemptFails | |
| EstabResets | |
| CurrEstab | |
| InSegs | |
| OutSegs | |
| RetransSegs | |
| InErrs | |
| OutRsts |
Options - Generic Options
| Setting | Default | Description | Type |
|---|---|---|---|
| allowed_names | ListenOverflows, ListenDrops, TCPLoss, TCPTimeouts, TCPFastRetrans, TCPLostRetransmit, TCPForwardRetrans, TCPSlowStartRetrans | list of entries to collect, empty to collect all | str |
| byte_unit | byte | Default numeric output(s) | str |
| enabled | False | Enable collecting these metrics | bool |
| measure_collector_time | False | Collect the collector run time in ms | bool |
servers.hostname.tcp.ActiveOpens 0.0
servers.hostname.tcp.ArpFilter 0.0
servers.hostname.tcp.AttemptFails 0.0
servers.hostname.tcp.CurrEstab 0.0
servers.hostname.tcp.DelayedACKLocked 144.0
servers.hostname.tcp.DelayedACKLost 10118.0
servers.hostname.tcp.DelayedACKs 125491.0
servers.hostname.tcp.EmbryonicRsts 0.0
servers.hostname.tcp.EstabResets 0.0
servers.hostname.tcp.IPReversePathFilter 0.0
servers.hostname.tcp.InErrs 0.0
servers.hostname.tcp.InSegs 1.0
servers.hostname.tcp.ListenDrops 0.0
servers.hostname.tcp.ListenOverflows 0.0
servers.hostname.tcp.LockDroppedIcmps 4.0
servers.hostname.tcp.MaxConn 0.0
servers.hostname.tcp.OfoPruned 0.0
servers.hostname.tcp.OutOfWindowIcmps 10.0
servers.hostname.tcp.OutRsts 0.0
servers.hostname.tcp.OutSegs 0.0
servers.hostname.tcp.PAWSActive 0.0
servers.hostname.tcp.PAWSEstab 0.0
servers.hostname.tcp.PAWSPassive 0.0
servers.hostname.tcp.PassiveOpens 0.0
servers.hostname.tcp.PruneCalled 0.0
servers.hostname.tcp.RcvPruned 0.0
servers.hostname.tcp.RetransSegs 0.0
servers.hostname.tcp.RtoAlgorithm 0.0
servers.hostname.tcp.RtoMax 0.0
servers.hostname.tcp.RtoMin 0.0
servers.hostname.tcp.SyncookiesFailed 9.0
servers.hostname.tcp.SyncookiesRecv 0.0
servers.hostname.tcp.SyncookiesSent 0.0
servers.hostname.tcp.TCPAbortFailed 0.0
servers.hostname.tcp.TCPAbortOnClose 38916.0
servers.hostname.tcp.TCPAbortOnData 143.0
servers.hostname.tcp.TCPAbortOnLinger 0.0
servers.hostname.tcp.TCPAbortOnMemory 0.0
servers.hostname.tcp.TCPAbortOnSyn 0.0
servers.hostname.tcp.TCPAbortOnTimeout 68.0
servers.hostname.tcp.TCPBacklogDrop 0.0
servers.hostname.tcp.TCPDSACKIgnoredNoUndo 1025.0
servers.hostname.tcp.TCPDSACKIgnoredOld 292.0
servers.hostname.tcp.TCPDSACKOfoRecv 0.0
servers.hostname.tcp.TCPDSACKOfoSent 0.0
servers.hostname.tcp.TCPDSACKOldSent 10175.0
servers.hostname.tcp.TCPDSACKRecv 1580.0
servers.hostname.tcp.TCPDSACKUndo 2448.0
servers.hostname.tcp.TCPDeferAcceptDrop 0.0
servers.hostname.tcp.TCPDirectCopyFromBacklog 35660.0
servers.hostname.tcp.TCPDirectCopyFromPrequeue 19340531.0
servers.hostname.tcp.TCPFACKReorder 0.0
servers.hostname.tcp.TCPFastRetrans 1184.0
servers.hostname.tcp.TCPForwardRetrans 41.0
servers.hostname.tcp.TCPFullUndo 0.0
servers.hostname.tcp.TCPHPAcks 12673896.0
servers.hostname.tcp.TCPHPHits 10361792.0
servers.hostname.tcp.TCPHPHitsToUser 5667.0
servers.hostname.tcp.TCPLoss 188.0
servers.hostname.tcp.TCPLossFailures 7.0
servers.hostname.tcp.TCPLossUndo 6538.0
servers.hostname.tcp.TCPLostRetransmit 7.0
servers.hostname.tcp.TCPMD5NotFound 0.0
servers.hostname.tcp.TCPMD5Unexpected 0.0
servers.hostname.tcp.TCPMemoryPressures 0.0
servers.hostname.tcp.TCPMinTTLDrop 0.0
servers.hostname.tcp.TCPPartialUndo 0.0
servers.hostname.tcp.TCPPrequeueDropped 0.0
servers.hostname.tcp.TCPPrequeued 114232.0
servers.hostname.tcp.TCPPureAcks 1003528.0
servers.hostname.tcp.TCPRcvCollapsed 0.0
servers.hostname.tcp.TCPRenoFailures 0.0
servers.hostname.tcp.TCPRenoRecovery 0.0
servers.hostname.tcp.TCPRenoRecoveryFail 0.0
servers.hostname.tcp.TCPRenoReorder 0.0
servers.hostname.tcp.TCPSACKDiscard 0.0
servers.hostname.tcp.TCPSACKReneging 0.0
servers.hostname.tcp.TCPSACKReorder 0.0
servers.hostname.tcp.TCPSackFailures 502.0
servers.hostname.tcp.TCPSackMerged 1121.0
servers.hostname.tcp.TCPSackRecovery 364.0
servers.hostname.tcp.TCPSackRecoveryFail 13.0
servers.hostname.tcp.TCPSackShiftFallback 3091.0
servers.hostname.tcp.TCPSackShifted 2356.0
servers.hostname.tcp.TCPSchedulerFailed 0.0
servers.hostname.tcp.TCPSlowStartRetrans 2540.0
servers.hostname.tcp.TCPSpuriousRTOs 9.0
servers.hostname.tcp.TCPTSReorder 0.0
servers.hostname.tcp.TCPTimeWaitOverflow 0.0
servers.hostname.tcp.TCPTimeouts 15265.0
servers.hostname.tcp.TW 89479.0
servers.hostname.tcp.TWKilled 0.0
servers.hostname.tcp.TWRecycled 0.0