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

from [Kouya Shimura] [Permanent Link][Original]
To: "Xu, Anthony" <anthony.xu@xxxxxxxxx>
Subject: RE: [Xen-ia64-devel] Question about migration
From: Kouya Shimura <kouya@xxxxxxxxxxxxxx>
Date: Wed, 13 Feb 2008 13:18:01 +0900
Cc: xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
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Xu, Anthony writes:
> You are right here, if migration happens in the same machine,
> How about migrate to another physical machine?
> There may be different ITC value in different machine.

I tried it. Actually far ITC jumping has occurred.
This could happen in domain save/restore also.

But the monotonicity of system time (gettimeofday) is guaranteed.
that seems to be done in:
time_resume()@linux-2.6.18-xen.hg/arch/ia64/kernel/time.c.

IMHO the strict ITC emulation is not necessary for PV domain.

Thanks,
Kouya

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