Re: [Xen-devel] Xen 3.2.2 - Timer ISR/0: Time went backwards

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

What sort of hardware?

 -- Keir

On 4/8/08 19:51, "Christopher S. Aker" <caker@xxxxxxxxxxxx> wrote:

> 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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