| Re: [chrony-users] Commercial unit running chrony, benefits of 'xleave' ? |
[ Thread Index |
Date Index
| More chrony.tuxfamily.org/chrony-users Archives
]
- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] Commercial unit running chrony, benefits of 'xleave' ?
- From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
- Date: Thu, 3 Feb 2022 16:19:15 +0100
- Authentication-results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mlichvar@xxxxxxxxxx
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1643901559; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=viIohSmQVCpxXB1xxyYMRVdaJWx8XDQZxFGwONaRAms=; b=gsOa7aTcCEjl4/DNGKP3u8WBBwcxKAfK2d0rwitqL7KZ8Z6ExIJ6eEIza3FrKxrroAbkuL OjsAySAaa75Pnl7w3FKXlanWloaUaNoHs+NoX7VVaUOVRAalqDIegl6sloI67jxQsZBvDC SQ9slzeKtuPcI7dXZZLrGnKxOZhOXfo=
On Thu, Feb 03, 2022 at 09:03:38AM -0600, Matthew Eshleman wrote:
> The ntpdata for this TM2000B server, as reported from our target embedded
> linux device:
> Mode : Server
> Stratum : 1
> Poll interval : 1 (2 seconds)
> Precision : -10 (0.000976562 seconds)
The server is claiming a precision of ~1ms here. That's bad.
> Peer delay : 0.000977595 seconds
> Peer dispersion : 0.000977595 seconds
The client uses the server precision as the minimum for its peer delay
and dispersion, so that's where that 1/2+1=1.5ms you see in the
sources report is coming from.
The specs on the vendor's site claim "HW time stamp", but I suspect
it's for PTP only. I don't see any specifications for NTP or PTP
accuracy there.
--
Miroslav Lichvar
--
To unsubscribe email chrony-users-request@xxxxxxxxxxxxxxxxxxxx
with "unsubscribe" in the subject.
For help email chrony-users-request@xxxxxxxxxxxxxxxxxxxx
with "help" in the subject.
Trouble? Email listmaster@xxxxxxxxxxxxxxxxxxxx.