[tor-relays] How to reduce tor CPU load on a single bridge?

[David Fifield]

On Fri, Dec 09, 2022 at 01:09:05AM +0000, Gary C. New wrote:
> Is it truly necessary to expose the ORPort to the World in a pluggable
> transport configuration?

I don't know if it is necessary for ordinary bridges to expose the
ORPort. For a long time, it was necessary, because BridgeDB used the
ORPort to check that a bridge was running, before distributing it to
users. See:
https://bugs.torproject.org/tpo/core/tor/7349
But now there is rdsys and bridgestrap, which may have the ability to
test the obfs4 port rather than the ORPort. I cannot say whether that
removes the requirement to expose the ORPort.
https://gitlab.torproject.org/tpo/anti-censorship/rdsys/-/merge_requests/36

For the special case of the default bridges shipped with Tor Browser, it
is not necessary to export the ORPort, because those bridges are not
distributed by rdsys.