[tor-bugs] #33763 [Core Tor/Tor]: Consider setting TCP_NOTSENT_LOWAT to 1 byte on our TCP connections

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Mar 30 21:59:02 UTC 2020


#33763: Consider setting TCP_NOTSENT_LOWAT to 1 byte on our TCP connections
-----------------------------------------------+---------------------------
 Reporter:  dgoulet                            |          Owner:  (none)
     Type:  enhancement                        |         Status:  new
 Priority:  Medium                             |      Milestone:  Tor:
                                               |  0.4.4.x-final
Component:  Core Tor/Tor                       |        Version:
 Severity:  Normal                             |     Resolution:
 Keywords:  tor-relay performance scaling tcp  |  Actual Points:
Parent ID:                                     |         Points:  0.2
 Reviewer:                                     |        Sponsor:
-----------------------------------------------+---------------------------

Comment (by robgjansen):

 I thought this would be done **after** moving Tor to using epoll directly,
 so that we could stop using the part of KIST that checks for *tcp_info*
 every 10 milliseconds. Is that correct? Or do you envision using
 *TCP_NOTSENT_LOWAT* on top of KIST (which we never simulated/tested)?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33763#comment:1>
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