[tor-consensus-health] Consensus issues

[Linus Nordberg]

gk at torproject.org wrote
Wed,  9 Oct 2024 05:06:37 +0000 (UTC):

> NOTICE: Downloading the consensus from maatuska took 31.4s. Median
> download time is 1.1s: moria1 => 1.0s, dizum => 0.4s, gabelmoo =>
> 0.4s, dannenberg => 0.5s, maatuska => 31.4s, longclaw => 1.1s, bastet
> => 1.5s, faravahar => 2.0s
> NOTICE: The system clock of maatuska is 22 seconds off

maatuska's clock doesn't seem to be or have been off recently, judging
from system logs.

>From reading doctor/consensus_health_checker.py it seems like
clock_skew, on which the warning about system clock being off is based,
assumes that the time it takes between request being sent and authority
composing a reply header is zero.

If that's true it follows that with a correct system clock on the
authority, the warning indicates how much time was spent between doctor
sending the request and the authority handling it.