[tor-bugs] #20459 [Core Tor/Tor]: ewma_cmp_cmux never considers policies different

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#20459: ewma_cmp_cmux never considers policies different
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 Reporter:  pastly                         |          Owner:
     Type:  defect                         |         Status:  needs_review
 Priority:  High                           |      Milestone:  Tor:
                                           |  0.2.9.x-final
Component:  Core Tor/Tor                   |        Version:  Tor:
                                           |  0.2.6.2-alpha
 Severity:  Normal                         |     Resolution:
 Keywords:  029-backport, review-group-11  |  Actual Points:
Parent ID:                                 |         Points:
 Reviewer:                                 |        Sponsor:
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Comment (by pastly):

 Also FWIW, I'm currently running this change in small Shadow networks as
 I'm testing other things. I'm measuring kernel queue time, tor queue time,
 network throughput, and time to download. By these four metrics, this
 change doesn't hurt a relay in a small network. It also doesn't really
 seem to help.

 I started a large Shadow simulation a couple days ago, but it died
 sometime last night :(. I've started it again. I will report back when it
 has finished. I suspect the small network was too small for the difference
 to be noticeable. Namely

 - not enough channels from one relay to ~all others
 - not enough circuits per channel

 The large network has 500 relays and 7500 clients compared to the small's
 11 and 12 respectively.

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Ticket URL: <https://troodi.torproject.org/projects/tor/ticket/20459#comment:11>
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