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

To: "Isaku Yamahata" <yamahata@xxxxxxxxxxxxx>
Subject: RE: [Xen-ia64-devel] Question about migration
From: "Xu, Anthony" <anthony.xu@xxxxxxxxx>
Date: Fri, 1 Feb 2008 16:01:04 +0800
Cc: xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
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Thread-topic: [Xen-ia64-devel] Question about migration
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,


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