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Add a new metric to detect the number of spurious loss recoveries.

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- Implements RFC 3522 (Eifel detection algorithm) to detect if the connection
entered loss recovery unnecessarily.
- Added a new metric to count the total number of spurious loss recoveries.
- Added tests to verify the new metric.

PiperOrigin-RevId: 401637359
This commit is contained in:
Nayana Bidari
2021-10-07 16:51:06 -07:00
committed by gVisor bot
parent 0743a862e5
commit 487651ac46
6 changed files with 392 additions and 3 deletions
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pkg/sentry/socket/netstack/netstack.go
+1
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@@ -274,6 +274,7 @@ var Metrics = tcpip.Stats{
ChecksumErrors: mustCreateMetric("/netstack/tcp/checksum_errors", "Number of segments dropped due to bad checksums."),
FailedPortReservations: mustCreateMetric("/netstack/tcp/failed_port_reservations", "Number of time TCP failed to reserve a port."),
SegmentsAckedWithDSACK: mustCreateMetric("/netstack/tcp/segments_acked_with_dsack", "Number of segments for which DSACK was received."),
SpuriousRecovery: mustCreateMetric("/netstack/tcp/spurious_recovery", "Number of times the connection entered loss recovery spuriously."),
},
UDP: tcpip.UDPStats{
PacketsReceived: mustCreateMetric("/netstack/udp/packets_received", "Number of UDP datagrams received via HandlePacket."),