[tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

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#22798: Windows relay is several times slower than Linux relay
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 Reporter:  Vort                           |          Owner:
     Type:  defect                         |         Status:  new
 Priority:  Medium                         |      Milestone:  Tor:
                                           |  unspecified
Component:  Core Tor/Tor                   |        Version:  Tor: 0.2.9.11
 Severity:  Normal                         |     Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID:                                 |         Points:  5
 Reviewer:                                 |        Sponsor:
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Comment (by Vort):

 Another thing worth trying is setting SO_SNDBUF=IDEAL_SEND_BACKLOG after
 every send().
 (No v/2 with this test)
 Results:
 {{{
 bw = 410 KiB/s, buf = 262144
 bw = 2953 KiB/s, buf = 2097152
 bw = 3209 KiB/s, buf = 4194304
 bw = 165 KiB/s, buf = 4194304
 bw = 356 KiB/s, buf = 4194304
 bw = 287 KiB/s, buf = 4194304
 bw = 2093 KiB/s, buf = 4194304
 bw = 1189 KiB/s, buf = 4194304
 bw = 1189 KiB/s, buf = 4194304
 bw = 1194 KiB/s, buf = 4194304
 bw = 1189 KiB/s, buf = 4194304
 bw = 1190 KiB/s, buf = 4194304
 bw = 1189 KiB/s, buf = 4194304
 }}}
 Now I am almost sure that bandwidth drops are due to WANem limiting.
 But I don't have a real 10 Mbit/150 ms link for testing purposes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22798#comment:70>
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