[tor-bugs] #24158 [Core Tor/Tor]: I get this error "Looks like our kernel doesn't have the support for KIST anymore." on my relay

Tor Bug Tracker & Wiki blackhole at torproject.org
Tue Nov 7 11:47:40 UTC 2017

#24158: I get this error "Looks like our kernel doesn't have the support for KIST
anymore." on my relay
 Reporter:  Dbryrtfbcbhgf  |          Owner:  (none)
     Type:  defect         |         Status:  new
 Priority:  Medium         |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor   |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:  tor-sched      |  Actual Points:
Parent ID:                 |         Points:
 Reviewer:                 |        Sponsor:
Changes (by pastly):

 * keywords:   => tor-sched


 Thank you for running alpha Tor and reporting this.

 > I keep getting this error.
 > [notice]

 It's not an error. It's a friendly FYI.

 Dbryrtfbcbhgf: do you get these messages almost immediately when Tor
 starts or a few minutes/hours/++ later? My thinking is this: if it happens
 immediately, then that's a good argument for moving these messages into
 info as there may be plenty more relays that run on these rather old (but
 stable and bug fixed, right?) kernels. If it happens later, it isn't as
 good as an argument IMHO.

 Some open questions: is it important for people to know what scheduler
 they are using? What if they changed `Schedulers` in their torrc? What if
 their kernel suddenly stopped supporting a scheduler and they changed?

 In general I think it is important for people to be able to tell what
 scheduler their relay is using. Maybe these fallback messages are too
 error-looking though. And maybe if the user didn't set `Schedulers`, they
 really don't care and we shouldn't log anything. Do we tell users that
 they're using EWMA?

 **So my proposed solution** is to log this stuff at info by default, but
 if the user has set `Schedulers`, then to log it at notice.

 Sebastian: I'm making the manual a bit better. I think you're right: no
 one needs to know the acronym "AMAP".

 See my ticket24158 on gitweb.tpo for the manual language change.

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24158#comment:5>
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