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

Gary C. New garycnew at yahoo.com
Wed Jan 26 23:52:03 UTC 2022

I've been following your progress in the "Add load balancing to bridge (#40095)" issue.
> The apparent decrease has to be spurious, since even at the beginning the bridge was moving more than 10 MB/s in both directions. A couple of hypotheses about what might be happening:   
   - Onionoo is only showing us one instance out of the four. The actual numbers are four times higher.
Per my previous response, my findings are consistent with yours in that Onionoo only shows metrics for a single instance; except, for consensus weight.
> Here are the most recent heartbeat logs. It looks like the load is fairly balanced, with each of the four tor instances having sent between 400 and 500 GB since being started.

Your Heartbeat logs continue to appear to be in good health. When keys are rotated, the Heartbeat logs will be a key indicator in validating health whether connections are bleeding off from or remaining with a particular instance.
> I worried a bit about the "0 with IPv6" in a previous comment. Looking at the bridge-stats files, I don't think there's a problem.
I'm glad to hear you feel the IPv6 reporting appears to be a false-negative. Does this mean there's something wrong with IPv6 Heartbeat reporting?
> Despite the load balancing, the 8 CPUs are pretty close to maxed. I would not mind having 16 cores right now. We may be in an induced demand situation where we make the bridge faster → the bridge gets more users → bridge gets slower.
I believe your observation is correct with regard to an induced traffic situation. As cpu resources increase, it will likely be lagged by increased traffic, until demand is satisfied or you run out of cpu resources, again. Are your existing 8 cpu's only single cores? Is it too difficult to upgrade with your VPS provider? The O/S should detect the virtual hardware changes and add them accordingly. My current resource constraint is RAM, but I'm using bare-metal machines.
Great Progress!

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