RE: [Xen-devel] Time went backwards in domain0.

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

Timekeeping in a virtual environment is very complicated
and there are many tricks employed to help virtual time
track wall time.  These tricks are often very guest
dependent and VMware doesn't support Xen as a guest
(though it may mostly work).

A very good guide describing virtual time issues is:
http://www.vmware.com/pdf/vmware_timekeeping.pdf 

The same issues apply to guests running on Xen, but
Xen has solved them differently.

Dan

> -----Original Message-----
> From: wenchengjian [mailto:wenchengjian@xxxxxxxxxxxxxxx]
> Sent: Monday, November 24, 2008 7:36 AM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] Time went backwards in domain0.
>
>
> Hi，
>      When I ran xen3.3 and Debian as a virtual machine of VMware 
> Workstation 6.5,
> I was confused with the messages as following. These three
> messages came 
>  from debian kernel.
>
> Timer ISR/1: Time went backwards: delta=-14094538 delta_cpu=15744210 
> shadow=2938
> 410245081 off=796245380 processed=2939220584096
> cpu_processed=2939190745348
>   0: 2939220584096
>   1: 2939190745348
>
> Timer ISR/1: Time went backwards: delta=-15189087 delta_cpu=24649661 
> shadow=2938
> 410245081 off=895151589 processed=2939320584096
> cpu_processed=2939280745348
>   0: 2939320584096
>   1: 2939280745348
>
> Timer ISR/1: Time went backwards: delta=-13267651 delta_cpu=16571097 
> shadow=2938
> 410245081 off=907072740 processed=2939330584096
> cpu_processed=2939300745348
>   0: 2939330584096
>   1: 2939300745348
>
> So I need your help about this information. Is there any
> solution I can 
> avoid them?
> Thanks,
> Dowen
>
>
>
>
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