[tor-bugs] #8470 [Firefox Patch Issues]: Request randomization a lot less random in FF17

Mon Apr 8 21:45:01 UTC 2013

#8470: Request randomization a lot less random in FF17
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 Reporter:  mikeperry                               |          Owner:  mikeperry
     Type:  defect                                  |         Status:  new      
 Priority:  critical                                |      Milestone:           
Component:  Firefox Patch Issues                    |        Version:           
 Keywords:  tbb-rebase-regression, MikePerry201304  |         Parent:           
   Points:                                          |   Actualpoints:           
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Comment(by mikeperry):

 Ok, I've been testing that patch with a debug build + logs for a bit. I've
 discovered that quite a few of the pipeline connections are hitting the
 hardcoded timeout of 1.5 seconds and getting rescheduled. This might not
 be too bad, because it should just create more opportunities for
 randomization, *except* that the code also marks connections that timeout
 as unsuitable for future pipelining. Once the connection limit is hit,
 pipelining then stops entirely.

 So in effect, for large websites, pipelinining is almost completely
 disabled for Tor by this timeout. It looks like this specific
 pref+variable were a new addition to the FF17 code during the pipelining
 rewrite, but there may have been an analog to this timer in FF10 and
 before...

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8470#comment:6>
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