[tor-relays] Tor relay doing 400 Mbps up, 50 Mbps down until reboot

[forest-relay-contact--- via tor-relays <tor-relays@xxxxxxxxxxxxxxxxxxxx>]

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Hello.

One of my relays, 54C85B97B4A5253483AA269B341C4CCF9328C443, had 400 Mbps
up and only 50 Mbps down for several hours. Performance got so bad that
could barely SSH in. Unfortunately, I rebooted before doing diagnostics
and the problem has not happened since, so I couldn't see if Tor logged
asymmetric bandwidth use in its heartbeat. Nothing in the logs indicate
anything abnormal. This started on Jun 25th, 12:30 AM UTC and continued
until I rebooted at around 4:00 AM UTC. Tor's CPU use was 100% for the
duration of this event and the uplink was not saturated.

Is this something that has happened before? Could it be some DoS attack?
As far as I know, the only way to get Tor to use asymmetric bandwidth is
to use it as a directory mirror.

Regards,
forest
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