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devel / comp.protocols.time.ntp / AIX xntpd slew questions

SubjectAuthor
* AIX xntpd slew questionsWael Mohamed
+- AIX xntpd slew questionsWael Mohamed
`* Re: [questions] AIX xntpd slew questionsHarlan Stenn
 `* Re: [questions] AIX xntpd slew questionsWael Mohamed
  `- Re: [questions] AIX xntpd slew questionsMartin Burnicki

1
AIX xntpd slew questions

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Subject: AIX xntpd slew questions
From: eng.wael...@gmail.com (Wael Mohamed)
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 by: Wael Mohamed - Fri, 30 Jun 2023 17:32 UTC

1. Does the xntpd "-x" option prevent the system clock from going backwards to adjust to NTP time, or does it limit it to only go backwards at small intervals?

2. Does the slewalways prevent the system clock from going backwards?

3. If we have a negative drift in the ntp.drift file, is that something that would be adjusted many times across each second, or would it adjust as needed when it has drifted to the point of say 1 millisecond off?

4. What's the difference between NTP slew mode and step mode?

5. What is the slow/step threshold value in AIX?

Thanks,
Wael

AIX xntpd slew questions

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Subject: AIX xntpd slew questions
From: eng.wael...@gmail.com (Wael Mohamed)
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 by: Wael Mohamed - Fri, 30 Jun 2023 18:11 UTC

1. Does the xntpd "-x" option prevent the system clock from going backwards to adjust to NTP time, or does it limit it to only go backwards at small intervals?

2. Does the slewalways prevent the system clock from going backwards?

3. If we have a negative drift in the ntp.drift file, is that something that would be adjusted many times across each second, or would it adjust as needed when it has drifted to the point of say 1 millisecond off?

4. What's the difference between NTP slew mode and step mode?

5. What is the slow/step threshold value in AIX?

Thanks,
Wael

Re: [questions] AIX xntpd slew questions

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From: ste...@nwtime.org (Harlan Stenn)
Newsgroups: comp.protocols.time.ntp
Subject: Re: [questions] AIX xntpd slew questions
Date: Fri, 30 Jun 2023 21:58:00 -0000 (UTC)
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 by: Harlan Stenn - Fri, 30 Jun 2023 21:58 UTC

What version of xntpd?

On 6/30/2023 11:11 AM, Wael Mohamed wrote:
> 1. Does the xntpd "-x" option prevent the system clock from going backwards to adjust to NTP time, or does it limit it to only go backwards at small intervals?
>
> 2. Does the slewalways prevent the system clock from going backwards?
>
> 3. If we have a negative drift in the ntp.drift file, is that something that would be adjusted many times across each second, or would it adjust as needed when it has drifted to the point of say 1 millisecond off?
>
> 4. What's the difference between NTP slew mode and step mode?
>
> 5. What is the slow/step threshold value in AIX?
>
> Thanks,
> Wael

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Re: [questions] AIX xntpd slew questions

<dd21f076-2d2b-468a-b8e9-4f1d6321fe06n@googlegroups.com>

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Subject: Re: [questions] AIX xntpd slew questions
From: eng.wael...@gmail.com (Wael Mohamed)
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 by: Wael Mohamed - Tue, 25 Jul 2023 00:36 UTC

xntpd v4

Thanks,
Wael

Re: [questions] AIX xntpd slew questions

<u9o06j$31j$1@gwaiyur.mb-net.net>

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From: martin.b...@burnicki.net (Martin Burnicki)
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Subject: Re: [questions] AIX xntpd slew questions
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 by: Martin Burnicki - Tue, 25 Jul 2023 08:13 UTC

Am 25.07.23 um 02:36 schrieb Wael Mohamed:
> xntpd v4

If it's really called "xntpd" it's mostly version 3. With version 4,
xntpd was renamed to ntpd.

Also, v4 only refers to the protocol version, but the behavior of the
program depends on the program version.

So what is the outoput of the command

ntpq -c 'rv 0 version'

Martin

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