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tailscale/derp
julianknodt fe54721e31 derp: add pkt queue latency timer
It would be useful to know the time that packets spend inside of a queue before they are sent
off, as that can be indicative of the load the server is handling (and there was also an
existing TODO). This adds a simple exponential moving average metric to track the average packet
queue duration.
Changes during review:
Add CAS loop for recording queue timing w/ expvar.Func, rm snake_case, annotate in milliseconds,
convert

Signed-off-by: julianknodt <julianknodt@gmail.com>
4 years ago
..
derphttp derp{,/derphttp},magicsock: tell DERP server when ping acks can be expected 4 years ago
derpmap derp/derpmap: add São Paulo (derp11) 4 years ago
derp.go wgengine/magicsock, derp, derp/derphttp: respond to DERP server->client pings 4 years ago
derp_client.go derp: return keep-alive message up to callers 4 years ago
derp_server.go derp: add pkt queue latency timer 4 years ago
derp_test.go derp: handle net.ErrClosed in TestSendFreeze 4 years ago