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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
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Subject: kern/44372: some kernel options prevent NTP clock synchronization
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>Number:         44372
>Category:       kern
>Synopsis:       some kernel options prevent NTP clock synchronization
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>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:
>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:
>Unformatted:

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