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felixed

Member

Registered: 2021-10-28

Posts: 43  

Wer synchronisiert die Systemuhr?

Meine Systemuhr geht sekundengenau. Ich weiß nur nicht, warum. Weder ntp noch chrony ist installiert.

Wer macht das in Devuan? Oder ist's der Browser (Opera)?

Devuan chimaera, permanente Internetverbindung mit Ethernet.

Dutch_Master

Member

Registered: 2018-05-31

Posts: 277  

Re: Wer synchronisiert die Systemuhr?

There are more packages providing this functionality besides the pair you mentioned. You can find them with apt-search.

man apt

abcde

Member

Registered: 2024-01-20

Posts: 5  

Re: Wer synchronisiert die Systemuhr?

Vielleicht hast du ein anderes NTP Paket installiert. Z.b. NTPSEC. such am besten mal mit aptiude search ntp. Das zeigt in der ersten Spalte an, ob das Paket installiert ist oder nicht.

Übrigens. Die Hardware Uhr, die Linux beim booten Ausließt geht recht genau. Da muss man schon zum Teil Wochen  bis Monate warten, bis die ein paar Sekunden daneben geht.

aluma

Member

Registered: 2022-10-26

Posts: 533  

Re: Wer synchronisiert die Systemuhr?

NTP synchronization accuracy is nanoseconds, if I am not mistaken.
Just check your computer clock by opening it
https://time.is/

Last edited by aluma (2024-02-24 18:40:53)

felixed

Member

Registered: 2021-10-28

Posts: 43  

Re: Wer synchronisiert die Systemuhr?

I do not want to know how to synchronize the system clock, because it's perfectly done.

I want to find out which program does it on my system.

By the way:

$ sudo apt-search time
sudo: apt-search: Befehl nicht gefunden

Dutch_Master

Member

Registered: 2018-05-31

Posts: 277  

Re: Wer synchronisiert die Systemuhr?

My bad:

apt search time

aluma

Member

Registered: 2022-10-26

Posts: 533  

Re: Wer synchronisiert die Systemuhr?

@felixed
I apologize for the stupid suggestion. the goal was only to make sure that this was really synchronization and not a coincidence.
In addition to the NTP protocol, there are others and the cause may be GPS or amateur radio receivers.

Regards.

pcalvert

Member

Registered: 2017-05-15

Posts: 195  

Re: Wer synchronisiert die Systemuhr?

On my Chimaera-based Refracta system, the responsible program is ntpdate.

$ whereis ntpdate
ntpdate: /usr/sbin/ntpdate /usr/share/man/man8/ntpdate.8.gz

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Another one is called Luxxle.

felixed

Member

Registered: 2021-10-28

Posts: 43  

Re: Wer synchronisiert die Systemuhr?

Seems not to do it on my system.

$ whereis ntpdate
ntpdate:

@aluma
Thanks.

Deine Uhr hat exakt die richtige Zeit!Der Unterschied zu Time.is betrug +0,001 Sekunden (±0,089 Sekunden)

I think that's too good to be a coincidence.

ImpossibleObject

Member

Registered: 2024-03-03

Posts: 1  

Re: Wer synchronisiert die Systemuhr?

On my system:

$ whereis ntpd
ntpd: /usr/sbin/ntpd /usr/share/man/man8/ntpd.8.gz

aluma

Member

Registered: 2022-10-26

Posts: 533  

Re: Wer synchronisiert die Systemuhr?

permanente Internetverbindung mit Ethernet.

Just information

Many modern, inexpensive NICs include hardware support for PTP. This means that the NIC has its own clock, sometimes called the PTP Hardware Clock (PHC), that can be used to timestamp incoming and outgoing network packets. This hardware support makes it possible to achieve accuracies of less than 100 nanoseconds. However, achieving this level of accuracy requires running a time server on your local area network.

https://github.com/jclark/pc-ptp-ntp-guide