how does "journalctl --list-boots" works without RTC

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Subject: how does "journalctl --list-boots" works without RTC
From: Asfak Rahman <asfak.rahman@xxxxxxxxxxx>
Date: Mon, 17 Sep 2018 09:03:08 +0000
Accept-language: en-US

Hello,

My embedded board is running systemd v232 and I dont have RTC. So, the logs are completely depends on wallclock.

I see that the journalctl is doing some optimization in the output and not printing all the available boots.

root@ubuntu:~# journalctl --list-boots --no-pager
-1 28e4fbc0495343b3a58226965c447562 Thu 2018-07-05 14:47:02 UTC—Thu 2018-07-05 14:48:26 UTC
0 b2093b1c856e439488a6b65d64ef37d4 Thu 2018-07-05 14:48:27 UTC—Thu 2018-07-05 14:52:58 UTC

Waiting more than 6 min

root@ubuntu:~# journalctl --list-boots --no-pager
0 28e4fbc0495343b3a58226965c447562 Thu 2018-07-05 14:47:02 UTC—Thu 2018-07-05 14:55:31 UTC

Could somebody explain the behaviour?

BR,

Asfak

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