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Re: [tor-bugs] #24782 [Core Tor/Tor]: Set a lower default MaxMemInQueues value

#24782: Set a lower default MaxMemInQueues value
---------------------------------+------------------------------------
 Reporter:  teor                 |          Owner:  ahf
     Type:  defect               |         Status:  assigned
 Priority:  Medium               |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor         |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:  tor-relay, tor-ddos  |  Actual Points:
Parent ID:                       |         Points:  0.5
 Reviewer:                       |        Sponsor:
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Comment (by yawning):

 Replying to [comment:6 teor]:
 > > I do believe right now that the network is still fairly usable because
 we have big Guards able to use 5, 10, 12GB of RAM right now... Unclear to
 me if firing up the OOM more frequently would improve the situation but we
 should be very careful at not making every relays using a "too low amount
 of ram" :S.
 >
 > If the fastest relay can do 1 Gbps, then that's 125 MB per second. 12 GB
 of RAM is 100 seconds of traffic. Is it really useful to buffer 100
 seconds of traffic? (Or, under the current load, tens of thousands of
 useless circuits?)

 No, but you don't have a choice because you can't drop cells except if
 things are going catastrophically wrong and you're willing to tear down
 the circuit.

 http://yuba.stanford.edu/~nickm/papers/sigcomm2004.pdf

 However as the paper says:
 > It is a little difficult to persuade the operator of a
 > functioning, profitable network to take the risk and remove
 > 99% of their buffers. But that has to be the next step, and
 > we see the results presented in this paper as a first step
 > towards persuading an operator to try it.

 (The CoDel work also supports their hypothesis.)

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24782#comment:7>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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