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

from [Isaku Yamahata]

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To:	"Xu, Anthony" <anthony.xu@xxxxxxxxx>
Subject:	Re: [Xen-ia64-devel] Question about migration
From:	Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Date:	Fri, 1 Feb 2008 16:58:06 +0900
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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.

So in theory it's ok. But I'm not sure in practical.
Do you have any concrete examples/scenario in your mind?

-- 
yamahata

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