[tor-relays] 100K circuit request per minute for hours killed my relay

[Pascal Terjan <pterjan@xxxxxxxxx>]

Last night for 4h30 (until VPS provider shut it down) one of my middle
relays seems to have got in a bad state where it was using 100% CPU
continuously

It was not using much bandwidth, about 4MB/s, but reading the logs it
seems it was getting a lot of circuit requests (70K/minute initially,
100K at the end). Is there anything I can do about it?

Jul 20 19:41:20.000 [notice] Heartbeat: Tor's uptime is 157 days 18:00
hours, with 4642 circuits open. I've sent 13916.64 GB and received
13502.43 GB.
Jul 20 19:41:20.000 [notice] Average packaged cell fullness: 98.154%
Jul 20 19:41:20.000 [notice] TLS write overhead: 2%
Jul 20 19:41:20.000 [notice] Circuit handshake stats since last time:
8823/8823 TAP, 112411/112806 NTor.
Jul 21 00:52:06.000 [warn] Your computer is too slow to handle this
many circuit creation requests! Please consider using the
MaxAdvertisedBandwidth config option or choosing a more restricted
exit policy. [398 similar message(s) suppressed in last 60 seconds]
Jul 21 00:53:06.000 [warn] Your computer is too slow to handle this
many circuit creation requests! Please consider using the
MaxAdvertisedBandwidth config option or choosing a more restricted
exit policy. [46893 similar message(s) suppressed in last 60 seconds]
Jul 21 00:54:06.000 [warn] Your computer is too slow to handle this
many circuit creation requests! Please consider using the
MaxAdvertisedBandwidth config option or choosing a more restricted
exit policy. [66339 similar message(s) suppressed in last 60 seconds]
Jul 21 00:55:06.000 [warn] Your computer is too slow to handle this
many circuit creation requests! Please consider using the
MaxAdvertisedBandwidth config option or choosing a more restrict
ed exit policy. [69939 similar message(s) suppressed in last 60 seconds]
Jul 21 00:56:06.000 [warn] Your computer is too slow to handle this
many circuit creation requests! Please consider using the
MaxAdvertisedBandwidth config option or choosing a more restrict
ed exit policy. [73055 similar message(s) suppressed in last 60 seconds]

[...]

Jul 21 04:19:08.000 [warn] Your computer is too slow to handle this
many circuit creation requests! Please consider using the
MaxAdvertisedBandwidth config option or choosing a more restricted
exit policy. [101856 similar message(s) suppressed in last 60 seconds]
Jul 21 04:20:08.000 [warn] Your computer is too slow to handle this
many circuit creation requests! Please consider using the
MaxAdvertisedBandwidth config option or choosing a more restricted
exit policy. [97494 similar message(s) suppressed in last 60 seconds]
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