[tor-bugs] #30173 [Core Tor/Tor]: Ensure circuit padding can be safely disabled from consensus

Tor Bug Tracker & Wiki blackhole at torproject.org
Fri Apr 12 20:59:56 UTC 2019


#30173: Ensure circuit padding can be safely disabled from consensus
-------------------------+-------------------------------------------------
     Reporter:           |      Owner:  (none)
  mikeperry              |
         Type:           |     Status:  new
  enhancement            |
     Priority:  Medium   |  Milestone:
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  wtf-pad, tor-relay, tor-cell,
     Severity:  Normal   |  padding, 041-proposed
Actual Points:           |  Parent ID:  #28634
       Points:           |   Reviewer:
      Sponsor:           |
  Sponsor2-can           |
-------------------------+-------------------------------------------------
 Right now, to "disable" circuit padding, we have to set consensus
 parameters circpad_global_allowed_cells=1 and
 circpad_global_max_padding_pct=1, which actually only sets a limit of 1%
 of our traffic to be padding. Additionally, each padding cell that is
 *not* sent because this limit is reached causes an info log line to be
 written.

 We need another way to fully disable padding, for A/B performance testing.
 And we should rate limit that info log so relays logging at info don't
 print a line for every single padding cell they don't send.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30173>
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