[tor-relays] TOR Relay performance issue

Sat Jan 7 19:00:57 UTC 2017

Hello Thomas.

You may also have a look at this article if it helps and in case this is a new Tor Relay node:

https://blog.torproject.org/blog/lifecycle-of-a-new-relay

Cheers,

Dr Ciphers

---- On Sat, 07 Jan 2017 17:55:12 +0200 Thomas Maurice <thomas at maurice.fr> wrote ----

Hello all ! o/ 

It seems I am running into a performance issue with my relay, and I am 

not able to troubleshoot it, so I hope someone could point out something 

obvious I am missing! 

(for information, the relay is a 2vCPU, 2G RAM VM running on Scaleway) 

>From what I observe from the graphs, my maximal CPU usage ceils at ~60%, 

and the load ceils at 1 eventhough the TOR daemon is aware I have 2 

cores available, and I set the NumCPUs configuration option accordingly) 

First I tought that the network did not want to send me more traffic, 

but my graphs are way too regular to make this eventuality plausible, so 

I am pretty convinced that it is due to a lack of optimization on my side. 

(link to my graphs for reference 

http://www.noelshack.com/2017-01-1483803911-constancesurvingt.png this 

is a 1 hour snapshot, but it has been this constant for at least one day) 

My first hypothesis was that the daemon is running out of file 

descriptors, so I raised the limit that was in the defaults (doubled it 

actually, by editing /etc/init.d/tor like a pig, to test), but I did not 

observe any change in Grafana. 

It is supposed to be caped at 20MBps, and 25MBps burst so I doubt the 

limitation I am observing is enforced by the node itself. 

If anyone had any pointers I would be grateful! 

Cheers! 

-- 

Thomas 

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