From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olaf Hering <olaf@aepfle.de>
Subject: Re: [PATCH] xen: preserve native TSC speed during
 migration between identical hosts
Date: Tue, 30 May 2017 08:41:08 +0200
Message-ID: <20170530064108.GB26792@aepfle.de>
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To: Jan Beulich <JBeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>, Wei Liu <wei.liu2@citrix.com>, Ian Jackson <ian.jackson@eu.citrix.com>, xen-devel@lists.xen.org
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On Mon, May 29, Jan Beulich wrote:

> Finally I don't think a host wide option will do. If it is to be of use
> (considering that it used wrong may break applications), it needs
> to be per-domain, and its value needs to be migrated (perhaps
> in the form of a low/high pair of TSC frequency values).

How is it supposed to be propagated from one host to another?

With the global option one can unconditionally receive a domU and
preserve "native performance" in case of tsc_mode=default. With a
per-domU option one has to know upfront.


Olaf

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