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Message-Id: <200210220638.g9M6cQdv012283@www.freebsd.org>
Date: Mon, 21 Oct 2002 23:38:26 -0700 (PDT)
From: Adida Yoan <yoan.adida@lip6.fr>
To: freebsd-gnats-submit@FreeBSD.org
Subject: some kernel options prevent NTP clock synchronization
X-Send-Pr-Version: www-1.0

>Number:         44372
>Category:       kern
>Synopsis:       some kernel options prevent NTP clock synchronization
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    roberto
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Oct 21 23:40:01 PDT 2002
>Closed-Date:    
>Last-Modified:  Mon Jul 21 03:50:15 PDT 2003
>Originator:     Adida Yoan
>Release:        FreeBSD 4.7-RELEASE i386
>Organization:
>Environment:
FreeBSD localhost 4.7-RELEASE FreeBSD 4.7-RELEASE #0: Fri Oct 18 16:27:02 CEST 2002 root@localhost:/usr/src/sys/compile/PERSO i386
>Description:
When the options HZ=1000 and DEVICE_POLLING are set, the system clock cant synchronize. The ntp configuration is set to use just a single (stratum 2) server. In this configuration, the system clock will drift a lot (about 1 second every 10 NTP "seconds").
>How-To-Repeat:
device fxp
options HZ=1000
options DEVICE_POLLING
binaries and kernel updated by cvsup to
*default release=cvs tag=RELENG_4_7_0_RELEASE
or
*default release=cvs tag=RELENG_4_6_2_RELEASE
Just add the kernel options (i am using fxp but i think the result would be the same with any other device) on any of the above configurations (4.6.2 or 4.7), and run ntp as a client
To checkout the problem do a ntpq -c peer

>Fix:
      
>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->roberto 
Responsible-Changed-By: kris 
Responsible-Changed-When: Fri Jul 18 15:16:24 PDT 2003 
Responsible-Changed-Why:  
Assign to ntp maintainer 

http://www.freebsd.org/cgi/query-pr.cgi?pr=44372 

From: Ollivier Robert <roberto@FreeBSD.org>
To: freebsd-gnats-submit@FreeBSD.org, yoan.adida@lip6.fr
Cc:  
Subject: Re: kern/44372: some kernel options prevent NTP clock synchronization
Date: Mon, 21 Jul 2003 12:46:02 +0200

 I understand the problem but I don't see what I can do, it is something 
 to
 take up with the ntp authors (hackers@ntp.org).
 
>Unformatted:
