Bug#927458: apt-daily.timer Adding random time every 5 seconds

[Boylan, Ross]

According to the internet, the time updates every 5 seconds are coming from HyperV, the host hypervisor under which the system in question is running.  Why HyperV acts that way I don't know (guessing: to avoid large time jumps); I agree it seems absurd.  I'm running on a VM under HyperV.

As noted in my original report, these updates can reportedly be suppressed at the hypervisor level but a) it seems that might eventually cause clock drift and b) I have no direct access to the hypervisor (though I could ask someone who does).

I also don't know if HyperV would react badly if the VM time were not in sync with the host (e.g., disable hyperv time updates + install chrony).  I would hope not, but the aggressive update schedule also suggests it might.

Ross

________________________________________
From: Michael Biebl <biebl at debian.org>
Sent: Tuesday, April 30, 2019 1:19:03 AM
To: 927458 at bugs.debian.org; Boylan, Ross
Subject: Re: apt-daily.timer Adding random time every 5 seconds

Am 30.04.19 um 10:07 schrieb Michael Biebl:
> The underlying problem is, that your system time constantly changes.
> As a result, systemd will recalculate its timers.

Let me rephrase that: Why is the system time changed every 5s?
How much does your clock drift in that time frame?

I'm asking, because changing the system time every 5s seems pretty
excessive and I try to understand why your system does it.


--
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?