RE: [Xen-ia64-devel] Question about migration

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

Isaku Yamahata wrote:
> On Fri, Feb 01, 2008 at 03:08:24PM +0800, Xu, Anthony wrote:
>> In DomU, ar.itc is not virtualized, so application can get itc
>> directly. When DomU is migrated, how do you prevent vitc jump a lot(
>> foreward/backward)?
> 
> Currently nothing prevents it. So a big itc jump can happen.
> Anyway user application can be stopped/continued by SIGSTOP/SIGCONT
> so that user application should be tolerable with such a big jump of
> itc. 
Foreward jump may be OK,
How about back-ward jump? Application may be confused.

> 
> So in theory it's ok. But I'm not sure in practical.
> Do you have any concrete examples/scenario in your mind?
No, But I know some DB use ITC,

Anthony

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