[tor-relays] Issues reaching gigabit relay speeds

[Mitar]

Hi!

I have a gigabit connection and I am trying to utilize it as much as
possible as a Tor relay. When I try various speed tests I get on the
machine speeds close to gigabit, but when running Tor, I do not
achieve anything close to it. I even started two Tor nodes on the same
machine/connection, see here:

https://metrics.torproject.org/rs.html#details/567E9785458C605E59202755C74898E3C96FB1CC
https://metrics.torproject.org/rs.html#details/4CF9BAEB0DE6D7230D6B7DA0FF420C7CFD863885

The utilization of the machine is pretty low, top returns:

top - 20:27:33 up 4 days, 23:01,  1 user,  load average: 0.32, 0.28, 0.23
Tasks: 167 total,   1 running,  97 sleeping,   0 stopped,   0 zombie
%Cpu(s):  1.6 us,  0.6 sy,  0.0 ni, 97.3 id,  0.0 wa,  0.0 hi,  0.5 si,  0.0 st
KiB Mem :  3772912 total,   931336 free,  1574676 used,  1266900 buff/cache
KiB Swap:  3900412 total,  3900412 free,        0 used.  1915568 avail Mem

In configuration I have:

RelayBandwidthRate 125 MB
RelayBandwidthBurst 125 MB

Interesting is that it seems each Tor daemon on same machine runs
always around 5 MiB/s, when I started the second one, it just added to
it with another 5 MiB/s. So it is somewhere else where is the
bottleneck?

What could I do to improve things here? To me it looks like more
throughput should be possible?


Mitar

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