[tor-relays] MaxMemInQueues defends against 375000 circuits in 9 secs

[Felix]

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Hi everybody

Another circuit storm, right ?

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MaxMemInQueues 2 GB

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2017-09-26_17-55-00:
 PID JID USERNAME THR PRI NICE SIZE RES STATE C TIME CPU COMMAND
84847 2 256 6 20 0 484M 427M uwait 0 907:02 11.77% tor


2017-09-26_18-59-00:
 PID JID USERNAME THR PRI NICE SIZE RES STATE C TIME CPU COMMAND
84847 2 256 6 20 0 2437M 2380M uwait 0 917:03 18.26% tor

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On Tor 0.3.2.1-alpha 290274dbb5428bc5

Sep 26 18:24:37.000 [notice] Heartbeat: Tor's uptime is 4 days 18:59
hours, with 13714 circuits open. I've sent 2459.48 GB and received
2422.58 GB.
Sep 26 18:24:37.000 [notice] Circuit handshake stats since last time:
4635/4635 TAP, 113271/113271 NTor.
Sep 26 18:24:37.000 [notice] Since startup, we have initiated 0 v1
connections, 0 v2 connections, 3 v3 connections, and 214559 v4
connections; and received 886 v1 connections, 24624 v2 connections,
60722 v3 connections, and 354411 v4 connections.
Sep 26 18:59:28.000 [notice] We're low on memory. Killing circuits
with over-long queues. (This behavior is controlled by MaxMemInQueues.)
Sep 26 18:59:28.000 [notice] Removed 106528 bytes by killing 14408
circuits; 0 circuits remain alive. Also killed 0 non-linked directory
connections.
Sep 26 18:59:28.000 [notice] We're low on memory. Killing circuits
with over-long queues. (This behavior is controlled by MaxMemInQueues.)
Sep 26 18:59:28.000 [notice] Removed 528 bytes by killing 7 circuits;
0 circuits remain alive. Also killed 0 non-linked directory connections.

...

************************************************************************
****************
2500 x removed some bytes by killing between single and 300 circuits
(constantly increasing sawtoothy, average 150 circuits)
average 150 circuits x 2500 = 375000 circuits avoided in 9 seconds
************************************************************************
****************

...

Sep 26 18:59:37.000 [notice] We're low on memory. Killing circuits
with over-long queues. (This behavior is controlled by MaxMemInQueues.)
Sep 26 18:59:37.000 [notice] Removed 4624 bytes by killing 115
circuits; 0 circuits remain alive. Also killed 1 non-linked directory
connections.

[] https://
 lists.torproject.org/pipermail/tor-relays/2017-July/012624.html

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Cheers, Felix
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