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wgengine/magicsock: add probed MTU metrics

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Record the number of MTU probes sent, the total bytes sent, the number of times
we got a successful return from an MTU probe of a particular size, and the max
MTU recorded.

Updates #311

Signed-off-by: Val <valerie@tailscale.com>
This commit is contained in:
Val
2023-10-07 08:10:37 +02:00
committed by valscale
parent 893bdd729c
commit 249edaa349
2 changed files with 43 additions and 11 deletions
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17
wgengine/magicsock/endpoint.go
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@@ -633,6 +633,12 @@ func (de *endpoint) sendDiscoPing(ep netip.AddrPort, discoKey key.DiscoPublic, t
}, logLevel)
if !sent {
de.forgetDiscoPing(txid)
return
}
if size != 0 {
metricSentDiscoPeerMTUProbes.Add(1)
metricSentDiscoPeerMTUProbeBytes.Add(int64(pingSizeToPktLen(size, ep.Addr().Is6())))
}
}
@@ -1062,6 +1068,15 @@ func (de *endpoint) handlePongConnLocked(m *disco.Pong, di *discoInfo, src netip
knownTxID = true // for naked returns below
de.removeSentDiscoPingLocked(m.TxID, sp)
pktLen := int(pingSizeToPktLen(sp.size, sp.to.Addr().Is6()))
if sp.size != 0 {
m := getPeerMTUsProbedMetric(tstun.WireMTU(pktLen))
m.Add(1)
if metricMaxPeerMTUProbed.Value() < int64(pktLen) {
metricMaxPeerMTUProbed.Set(int64(pktLen))
}
}
now := mono.Now()
latency := now.Sub(sp.at)
@@ -1083,7 +1098,7 @@ func (de *endpoint) handlePongConnLocked(m *disco.Pong, di *discoInfo, src netip
}
if sp.purpose != pingHeartbeat {
de.c.dlogf("[v1] magicsock: disco: %v<-%v (%v, %v) got pong tx=%x latency=%v pktlen=%v pong.src=%v%v", de.c.discoShort, de.discoShort(), de.publicKey.ShortString(), src, m.TxID[:6], latency.Round(time.Millisecond), pingSizeToPktLen(sp.size, sp.to.Addr().Is6()), m.Src, logger.ArgWriter(func(bw *bufio.Writer) {
de.c.dlogf("[v1] magicsock: disco: %v<-%v (%v, %v) got pong tx=%x latency=%v pktlen=%v pong.src=%v%v", de.c.discoShort, de.discoShort(), de.publicKey.ShortString(), src, m.TxID[:6], latency.Round(time.Millisecond), pktLen, m.Src, logger.ArgWriter(func(bw *bufio.Writer) {
if sp.to != src {
fmt.Fprintf(bw, " ping.to=%v", sp.to)
}