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[Xen-devel] repeatable time jump

To: xen-devel@xxxxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] repeatable time jump
From: David Becker <becker@xxxxxxxxxxx>
Date: Tue, 28 Sep 2004 11:06:50 -0400
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I got the time jump to reproduce.  Shutting down xenU shifts system time on
xen0 by over an hour.  xen0 hwclock stays steady:

        xen0# date
        Tue Sep 28 10:45:13 EDT 2004
        xen0# xm list
        Name              Id  Mem(MB)  CPU  State  Time(s)  Console
        Domain-0           0       34    0  r----    120.1        
        xen0# xm create  memory=800  name=athos14
        builder=linux kernel=/boot/vmlinuz- ipaddr=
        ip= gateway= netmask= hostname=athos14
        interface=eth0 dhcp=off disk=phy:/dev/xenvg/athos14.root,hda1,w cpu=-1
        disk=phy:/dev/xenvg/athos14.swap,hda2,w root=/dev/hda1
        Using config file "/etc/xen/xmdefconfig".
        Started domain athos14, console on port 9605
        xen0# date
        Tue Sep 28 10:47:16 EDT 2004
        xen0# xm shutdown athos14
        xen0# xm list
        Name              Id  Mem(MB)  CPU  State  Time(s)  Console
        Domain-0           0       34    0  r----    129.2        
        xen0# date
        Tue Sep 28 11:59:01 EDT 2004
        xen0# hwclock
        Tue Sep 28 10:48:02 2004  -0.000000 seconds

The xen0 shift happens when xen0 clock is correct.  Further starting/stopping
of domains after the xen0 clock is off has more effect on xen0's system time.

xenU does not run ntp or hwclock.  If xenU is started after xen0's
system time is off, xenU has the right time.  I assume xenU is synced to
the hwclock time.

This is with today's pull of I'm using 2.6 for all domains.

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