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[Xen-devel] Time goes backwards in dom0 in xen-unstable

To: "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Time goes backwards in dom0 in xen-unstable
From: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Date: Tue, 14 Apr 2009 19:36:49 +0000 (GMT)
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I'm seeing some "Time went backwards" errors reported
in dom0 in near-tip (c/s 19515) xen-unstable build.
It's rare and random and not reproducible, but here's
the report that just showed up.  There was no load
running at the time.

I can move to 3.4-rc1 if that would be helpful but I
don't remember seeing any time-related changes recently.

This was on my dual-core test machine which reports
lots of power management info during Xen boot.


Timer ISR/0: Time went backwards: delta=-14971734 delta_cpu=25028266 shadow=3655
618577922 off=580668482 processed=3656214217729 cpu_processed=3656174217729
 0: 3656174217729
 1: 3656214217729
Timer ISR/0: Time went backwards: delta=-14971447 delta_cpu=25028553 shadow=3655
618577922 off=590668621 processed=3656224217729 cpu_processed=3656184217729
 0: 3656184217729
 1: 3656224217729
Timer ISR/0: Time went backwards: delta=-14970691 delta_cpu=25029309 shadow=3655
618577922 off=620669383 processed=3656254217729 cpu_processed=3656214217729
 0: 3656214217729
 1: 3656254217729
Timer ISR/0: Time went backwards: delta=-14970623 delta_cpu=25029377 shadow=3655
618577922 off=630669373 processed=3656264217729 cpu_processed=3656224217729
 0: 3656224217729
 1: 3656254217729
Timer ISR/0: Time went backwards: delta=-14969392 delta_cpu=25030608 shadow=3655
618577922 off=680670676 processed=3656314217729 cpu_processed=3656274217729
 0: 3656274217729
 1: 3656304217729
Timer ISR/0: Time went backwards: delta=-14967619 delta_cpu=25032381 shadow=3655
618577922 off=740672580 processed=3656374217729 cpu_processed=3656334217729
 0: 3656334217729
 1: 3656374217729
Timer ISR/0: Time went backwards: delta=-14967315 delta_cpu=25032685 shadow=3655
618577922 off=750672771 processed=3656384217729 cpu_processed=3656344217729
 0: 3656344217729
 1: 3656374217729

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