[tor-relays] big spike in cpu usage

[mick]

On Fri, 5 Apr 2013 13:50:29 -0400
Owen Gunden <ogunden at phauna.org> allegedly wrote:

> I have been running a non-exit tor relay for a few months now. It's
> on a metered VPS, so after some experimenting I found that I can
> afford about this much bandwidth:
> 
>   RelayBandwidthRate 250 KB
>   RelayBandwidthBurst 500 KB

Owen

You don't give details of your VPS, so comparisons may be difficult.
But I have the following config options on my main (non-exit) relay:

--------------
NumCPU 1
MaxOnionsPending 300

# rate limit - anything above about 2500 KB seems to cause tor 
# to invoke oom-killer

BandwidthRate 2100 KB 
BandwidthBurst 2200 KB
---------------

That relay is on a VM with 512Mb RAM, one CPU slice and 1Gig network
connectivity (with unlimited traffic allowance). Stats can be seen at:

https://atlas.torproject.org/#details/C332113DF99E367E4190424CE825057D91337ADD

I had the same problems you are seeing until I set the rate limits
above and increased MaxOnionsPending to 300. My CPU usage now hovers
around 65-85% for about 2000 established tor connections.

Mick

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