[tor-bugs] #18859 [Core Tor]: A new SOCKS connection should use a pre-built circuit for its first stream
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Thu Apr 21 17:59:09 UTC 2016
#18859: A new SOCKS connection should use a pre-built circuit for its first stream
-----------------------------+---------------------
Reporter: arthuredelstein | Owner:
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Core Tor | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
-----------------------------+---------------------
Comment (by arthuredelstein):
Replying to [comment:3 arma]:
> Arthur: can you attach an event log (setevents circ stream) here to show
the problem?
Here's an example session:
{{{
setevents circ stream
250 OK
getinfo circuit-status
250+circuit-status=
1 BUILT $F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings
BUILD_FLAGS=ONEHOP_TUNNEL,IS_INTERNAL,NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:03.769809
2 BUILT
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$A47CF4F0B9AFD005C0A5B67A503158923202BE90~dragon1993,$EC116BCB80565A408CE67F8EC3FE3B0B02C3A065~orion
BUILD_FLAGS=NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:04.809515 SOCKS_USERNAME="--unknown--"
SOCKS_PASSWORD="0"
3 BUILT
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$EF29F69F49FF1C17CBDCFF8E11E10CD9F6B9DF95~raincat,$6207FC9DDE4EC78F45BB24C53C2EEE63DCC2E2B6~PrivacyRepublic
BUILD_FLAGS=NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:05.790793
4 BUILT
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$385FE4D32D51C03766F3FBD24B108D6FB82C9E36~CDR,$2CF5110C8F31F45737F807F080ABA90A7AE50781~dragon1993
BUILD_FLAGS=IS_INTERNAL,NEED_CAPACITY,NEED_UPTIME PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:06.789676
5 BUILT
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$F60E3B747FE017346005243058FFFE72AA7D59A2~torpoc666,$5937800DEB5B3FDF68BD3392F2AE3A084254FE5F~tor6kryptonit
BUILD_FLAGS=IS_INTERNAL,NEED_CAPACITY,NEED_UPTIME PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:07.790465
.
250 OK
}}}
Now I opened a new tab and entered "https://arthuredelstein.github.io" in
the URL bar domain:
{{{
650 STREAM 14 NEW 0 arthuredelstein.github.io:443
SOURCE_ADDR=127.0.0.1:52129 PURPOSE=USER
650 STREAM 14 SENTCONNECT 3 arthuredelstein.github.io:443
650 STREAM 14 REMAP 3 23.235.43.133:443 SOURCE=EXIT
650 STREAM 14 SUCCEEDED 3 23.235.43.133:443
}}}
Then I waited a few seconds, and opened a new tab and entered
"example.com":
{{{
650 STREAM 15 NEW 0 example.com:80 SOURCE_ADDR=127.0.0.1:52130
PURPOSE=USER
650 CIRC 6 LAUNCHED BUILD_FLAGS=NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:55.108644
650 CIRC 6 EXTENDED $F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings
BUILD_FLAGS=NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:55.108644 SOCKS_USERNAME="example.com"
SOCKS_PASSWORD="0"
650 CIRC 6 EXTENDED
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$408807EE2ED6C87F921139ABE0C07E84203A8621~MysticOrb
BUILD_FLAGS=NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:55.108644 SOCKS_USERNAME="example.com"
SOCKS_PASSWORD="0"
650 CIRC 6 EXTENDED
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$408807EE2ED6C87F921139ABE0C07E84203A8621~MysticOrb,$B0964415A5380080570845E7CBFCADF87FDCCE5A~Necto7
BUILD_FLAGS=NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:55.108644 SOCKS_USERNAME="example.com"
SOCKS_PASSWORD="0"
650 CIRC 6 BUILT
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$408807EE2ED6C87F921139ABE0C07E84203A8621~MysticOrb,$B0964415A5380080570845E7CBFCADF87FDCCE5A~Necto7
BUILD_FLAGS=NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:55.108644 SOCKS_USERNAME="example.com"
SOCKS_PASSWORD="0"
650 STREAM 15 SENTCONNECT 6 example.com:80
650 STREAM 15 REMAP 6 93.184.216.34:80 SOURCE=EXIT
650 STREAM 15 SUCCEEDED 6 93.184.216.34:80
[snipped more circuit and stream events]
}}}
Finally I inspected the list of open circuits again.
{{{
getinfo circuit-status
250+circuit-status=
1 BUILT $F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings
BUILD_FLAGS=ONEHOP_TUNNEL,IS_INTERNAL,NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:03.769809
2 BUILT
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$A47CF4F0B9AFD005C0A5B67A503158923202BE90~dragon1993,$EC116BCB80565A408CE67F8EC3FE3B0B02C3A065~orion
BUILD_FLAGS=NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:04.809515 SOCKS_USERNAME="--unknown--"
SOCKS_PASSWORD="0"
3 BUILT
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$EF29F69F49FF1C17CBDCFF8E11E10CD9F6B9DF95~raincat,$6207FC9DDE4EC78F45BB24C53C2EEE63DCC2E2B6~PrivacyRepublic
BUILD_FLAGS=NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:05.790793
SOCKS_USERNAME="arthuredelstein.github.io" SOCKS_PASSWORD="0"
4 BUILT
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$385FE4D32D51C03766F3FBD24B108D6FB82C9E36~CDR,$2CF5110C8F31F45737F807F080ABA90A7AE50781~dragon1993
BUILD_FLAGS=IS_INTERNAL,NEED_CAPACITY,NEED_UPTIME PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:06.789676
5 BUILT
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$F60E3B747FE017346005243058FFFE72AA7D59A2~torpoc666,$5937800DEB5B3FDF68BD3392F2AE3A084254FE5F~tor6kryptonit
BUILD_FLAGS=IS_INTERNAL,NEED_CAPACITY,NEED_UPTIME PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:07.790465
6 BUILT
$F1A7CE1B1D558DC24E39B6B30FF217ECCEECF141~Kings,$408807EE2ED6C87F921139ABE0C07E84203A8621~MysticOrb,$B0964415A5380080570845E7CBFCADF87FDCCE5A~Necto7
BUILD_FLAGS=NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:43:55.108644 SOCKS_USERNAME="example.com"
SOCKS_PASSWORD="0"
7 BUILT $50586E25BE067FD1F739998550EDDCB1A14CA5B2~Jans
BUILD_FLAGS=ONEHOP_TUNNEL,IS_INTERNAL,NEED_CAPACITY PURPOSE=GENERAL
TIME_CREATED=2016-04-21T17:44:05.795443
.
250 OK
}}}
So my interpretation is that
1. arthuredelstein.github.io used a pre-built circuit (3)
2. example.com did not use a pre-built circuit, but instead a new circuit
(6) was launched
I tried browsing to a series of new domains, and my observation is that
the majority of the time behavior 2 happens. I guess this could be that
the rate of production of pre-built circuits is slower that the rate at
which I was browsing to new sites in my tests. So I guess my question is,
what determines the rate at which pre-built circuits are built, and could
we make a noticeable impact on performance if we increased that rate?
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18859#comment:4>
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