Hardware:
Xen: 3.2.1-rc2 64bit
dom0: 2.6.18.8 at changeset 622, PAE
# xm dmesg | grep -e sync -e timer
(XEN) checking TSC synchronization across 8 CPUs: passed.
(XEN) Platform timer overflows in 234 jiffies.
(XEN) Platform timer is 3.579MHz ACPI PM Timer
(XEN) Machine check exception polling timer started.
Spools one of these to console every few seconds:
Timer ISR/0: Time went backwards: delta=-4270576170971
delta_cpu=254829029 shadow=2037844042151244163 off=261710497
processed=2037848312989081849 cpu_processed=2037844042158081849
0: 2037844042158081849
1: 2037828468354081849
2: 2037848312989081849
3: 2037837726866081849
4: 2037842059197081849
5: 2037840075526081849
6: 2037845844663081849
7: 2037841593777081849
A few t's into Xen's console:
(XEN) *** Serial input -> Xen (type 'CTRL-a' three times to switch input
to DOM0)
(XEN) Min = 2037829427350793281 ; Max = 2037848310626701146 ; Diff =
18883275907865 (18883275907 microseconds)
(XEN) Min = 2037829428349256182 ; Max = 2037848311625163843 ; Diff =
18883275907661 (18883275907 microseconds)
(XEN) Min = 2037829428565188930 ; Max = 2037848311841096807 ; Diff =
18883275907877 (18883275907 microseconds)
This particular box does this with 3.2.0 - 3.2.2-rc2. I have another
box doing the same thing, except the delta is more sane (0 - 2
microseconds), however eventually dom0 freezes.
-Chris
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