Re: [Xen-devel] System time monotonicity

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 26/3/07 19:23, "John Levon" <levon@xxxxxxxxxxxxxxxxx> wrote:

>> From what I can work out, time is supposed to be monotonic but I admit I
> can't really understand the time code yet at least. I couldn't find any
> documentation on what to expect from system time. Any suggestions?
> 
> This seems to happen across all the hardware we've tried but this
> particular case is a Sun V20Z with two CPUs:
> 
>   x86 (AuthenticAMD family 15 model 5 step 10 clock 2392 MHz)
>         AMD Opteron(tm) Processor 250

Small backwards time deltas are possible from the current time code. You'll
have to filter them out yourself if you can't deal with them. We could add
extra code in Xen to stop this happening for any individual VCPU.

 -- Keir



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