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net/netcheck: change DERP HTTPS latency measurement to TCP connect time

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HTTPS and ICMP latency are fallbacks when STUN doesn't work. The lowest
value wins. When ICMP doesn't work you just get HTTPS. HTTPS latency was
way more variable than it needed to be as we were measuring "server
processing time" (inclusive of TLS, HTTPS) instead of just TCP connect
time.

We don't need to perform an HTTPS request, we really just need a TCP
ping, but aiming for a simpler change to start.

Updates tailscale/corp#22114

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited 2024-08-08 15:38:18 -07:00
parent f23932bd98
commit ac0f1cfcf4
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1 changed files with 3 additions and 3 deletions
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6
net/netcheck/netcheck.go
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@ -1108,9 +1108,9 @@ func (c *Client) measureHTTPSLatency(ctx context.Context, reg *tailcfg.DERPRegio
}
result.End(c.timeNow())
// TODO: decide best timing heuristic here.
// Maybe the server should return the tcpinfo_rtt?
return result.ServerProcessing, ip, nil
// TODO(jwhited): consider simplified TCP RTT. We don't need HTTPS or TLS
// involvement above.
return result.TCPConnection, ip, nil
}
func (c *Client) measureAllICMPLatency(ctx context.Context, rs *reportState, need []*tailcfg.DERPRegion) error {