#21394: connection timeouts are affecting Tor Browser usability
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Reporter: arthuredelstein | Owner: (none)
Type: defect | Status: new
Priority: Very High | Milestone: Tor:
| 0.3.3.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 arthuredelstein):
Sebastian created a tor patch to apply settings based on Dhalgren's:
{{{
index 078bde3ef..08ed219d2 100644
--- a/src/or/dns.c
+++ b/src/or/dns.c
@@ -1439,13 +1439,19 @@ configure_nameservers(int force)
#define SET(k,v) evdns_base_set_option(the_evdns_base, (k), (v))
if (evdns_base_count_nameservers(the_evdns_base) == 1) {
- SET("max-timeouts:", "16");
- SET("timeout:", "10");
+ SET("max-timeouts:", "255");
+ SET("timeout:", "5");
} else {
SET("max-timeouts:", "3");
SET("timeout:", "5");
}
+ // Elongate the queue of maximum inflight dns requests, so if a bunch
+ // time out at the resolver (happens commonly with unbound) we won't
+ // stall every other DNS request
+ SET("max-inflight:", "8192");
+ SET("attempts:", "1");
+
if (options->ServerDNSRandomizeCase)
SET("randomize-case:", "1");
else
}}}
gamambel applied this patch and ran tor. I ran my test and found no
timeouts:
https://arthuredelstein.net/tor/21394/exit_results_20171103_0137.json
https://docs.google.com/spreadsheets/d/1ZORq3WlV8-VaTiqoQ4bn3dEN3wkb0z6HkOcrkrG8z7A/edit?usp=sharing
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21394#comment:45>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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