kern/135008: FreeBSD-current/Xen timecounter jumps

>Number:         135008
>Category:       kern
>Synopsis:       FreeBSD-current/Xen timecounter jumps
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 27 20:30:02 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Adrian Chadd
>Release:        
>Organization:
>Environment:
>Description:
The Xen DomU clock seems "off". Its not sync'ed to the value of the Dom0 clock (at least by "date" in both VMs.) "xen.independent_wallclock" is 0 in the DomU.

I triggered a weird clock drift by running ntpdate in the dom0 by running ntpdate.

>How-To-Repeat:
In the Dom0:

[root@hosting-2 adrian]# ntpdate 203.56.14.1
28 May 04:03:03 ntpdate[30489]: step time server 203.56.14.1 offset 50.619242 sec
[root@hosting-2 adrian]# date
Thu May 28 04:03:07 WST 2009

In the DomU:

freebsd1# date
Mon May 25 04:04:39 UTC 2009
freebsd1# date
Sun May 24 07:03:31 UTC 2009


>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:
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