[tor-relays] Lots of dropped onion skins

[Jonathan Proulx]

With a bit of help from list archieves I found
https://github.com/Enkidu-6/tor-ddos which does prevent the "drops"

I remain curious why it seemed to be dropping before hitting cpu or
memory limits.  Though clearly there's no point in burning CPU on DDoS
processing, so I don't feel a great urgency about this.

-Jon

On Fri, Oct 07, 2022 at 10:42:29AM -0400, Jonathan D. Proulx wrote:
:HI All,
:
:I was checkign up on my (middle) relay stats:
:
:https://metrics.torproject.org/rs.html#details/9715C81BA8C5B0C698882035F75C67D6D643DBE3
:
:and saw an "overload" banner, after some learning I see lots of
:onionskins being dropped in the metrics:
:
:tor_relay_load_onionskins_total{type="tap",action="processed"} 890
:tor_relay_load_onionskins_total{type="tap",action="dropped"} 0
:tor_relay_load_onionskins_total{type="fast",action="processed"} 0
:tor_relay_load_onionskins_total{type="fast",action="dropped"} 0
:tor_relay_load_onionskins_total{type="ntor",action="processed"} 3096501
:tor_relay_load_onionskins_total{type="ntor",action="dropped"} 2827649
:tor_relay_load_onionskins_total{type="ntor_v3",action="processed"} 3096501
:tor_relay_load_onionskins_total{type="ntor_v3",action="dropped"} 2827649
:
:processed and dropped are growing pretty rapidly so maybe this is a
:know and ongoing attack, but I don't see why I would be dropping.
:
:The system has 8 corse and 8G RAM neither of which seems stressed.
:Less than 2G or RAM is in use and systrrem load (top under linux)
:reports ~70% idle (I guess if they're coming in really tight bursts it
:could average to that and still be droppong peaks).
:
:Anyone know what this is or have hints as to where to look?
:
:Thanks,
:-Jon
: