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[Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL

To: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>, "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Fri, 24 Jul 2009 09:04:10 +0100
Cc: "Dong, Eddie" <eddie.dong@xxxxxxxxx>, John Levon <levon@xxxxxxxxxxxxxxxxx>
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On 23/07/2009 17:39, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

>> Why would you expect host TSC consistency running on Xen to
>> be worse than
>> when running on a native OS?
> In short, it is because a new class of machine
> is emerging in the virtualization space that
> is really a NUMA machine, tries to look like
> a SMP (non-NUMA) machine by making memory access
> fast enough that NUMA-ness can be ignored,
> but for the purposes of time, is still a
> NUMA machine.

Okay, so the issue you are worried about is not specific to Xen. So how is
native Linux tackling this, for example?

 -- Keir

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