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Re: [tor-bugs] #21394 [Core Tor/Tor]: connection timeouts are affecting Tor Browser usability
#21394: connection timeouts are affecting Tor Browser usability
-------------------------------------------------+-------------------------
Reporter: arthuredelstein | Owner: (none)
Type: defect | Status:
| merge_ready
Priority: Very High | Milestone: Tor:
| 0.3.2.x-final
Component: Core Tor/Tor | Version:
Severity: Normal | Resolution:
Keywords: tbb-performance, tbb-usability, | Actual Points:
performance, tbb-needs |
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by Dhalgren):
Replying to [comment:55 arma]:
> Replying to [comment:54 arma]:
> > the client starts its 10 second timer when it sends the begin cell
>
> I should also point out that the client's *first* stream attempt is 10
seconds, but subsequent attempts (once it's given up on the first one and
tried a new circuit) are 15 seconds each.
Interesting, thank you for the detail. The number of successful resolves
arriving between 5 and 15 seconds is on the order of 0.45% and the
difference between discarding them and forwarding them not severe enough
to cause me regret over configuring this for 18 months. Here is a recent
set of Unbound statistics to illustrate. The data seems unlikely to be of
actionable use to adversaries and hopefully it's not improper to share
publicly:
{{{
unbound: [:0] info: server stats for thread 0: 1748646 queries, 368913
answers from cach
unbound: [:0] info: server stats for thread 0: requestlist max 331 avg
134.014 exceeded
unbound: [:0] info: average recursion processing time 6.735093 sec
unbound: [:0] info: histogram of recursion processing times
unbound: [:0] info: [25%]=0.0130326 median[50%]=0.0450708 [75%]=0.127054
unbound: [:0] info: lower(secs) upper(secs) recursions
unbound: [:0] info: 0.000000 0.000001 39515
unbound: [:0] info: 0.000032 0.000064 1
unbound: [:0] info: 0.000128 0.000256 1
unbound: [:0] info: 0.000256 0.000512 23408
unbound: [:0] info: 0.000512 0.001024 64670
unbound: [:0] info: 0.001024 0.002048 33392
unbound: [:0] info: 0.002048 0.004096 19250
unbound: [:0] info: 0.004096 0.008192 47427
unbound: [:0] info: 0.008192 0.016384 198450
unbound: [:0] info: 0.016384 0.032768 159053
unbound: [:0] info: 0.032768 0.065536 278833
unbound: [:0] info: 0.065536 0.131072 181936
unbound: [:0] info: 0.131072 0.262144 207508
unbound: [:0] info: 0.262144 0.524288 45953
unbound: [:0] info: 0.524288 1.000000 14731
unbound: [:0] info: 1.000000 2.000000 7530
unbound: [:0] info: 2.000000 4.000000 8677
unbound: [:0] info: 4.000000 8.000000 2740
unbound: [:0] info: 8.000000 16.000000 3461
unbound: [:0] info: 16.000000 32.000000 11938
unbound: [:0] info: 32.000000 64.000000 13751
unbound: [:0] info: 64.000000 128.000000 4671
unbound: [:0] info: 128.000000 256.000000 3268
unbound: [:0] info: 256.000000 512.000000 6127
unbound: [:0] info: 512.000000 1024.000000 2086
unbound: [:0] info: 1024.000000 2048.000000 626
unbound: [:0] info: 2048.000000 4096.000000 480
unbound: [:0] info: 4096.000000 8192.000000 200
unbound: [:0] info: 8192.000000 16384.000000 20
unbound: [:0] info: 16384.000000 32768.000000 6
unbound: [:0] info: 32768.000000 65536.000000 1
}}}
Unbound displays impressive patience w/r/t completing queries. Arrived at
0.46 by taking the percent of successful resolves under 16 seconds. Is
0.36% relative to queries resolved in under 16 seconds plus resolves from
cache. 2.47% of queries resolve in over 16 seconds, are lost.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21394#comment:56>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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