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Re: [Xen-devel] [RFC] Correct/fast timestamping in apps under Xen [1 of

To: Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Subject: Re: [Xen-devel] [RFC] Correct/fast timestamping in apps under Xen [1 of 4]: Reliable TSC
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Thu, 08 Oct 2009 10:22:32 +0100
Cc: "kurt.hackel@xxxxxxxxxx" <kurt.hackel@xxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>
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On 08/10/2009 10:13, "Tim Deegan" <Tim.Deegan@xxxxxxxxxxxxx> wrote:

> So system designers
>> (other than perhaps for the very largest superNUMA
>> machines) would be silly to not use it.
> 
> Oh, that's reassuring.  System designers would never do something that
> silly.  :)
> 
> If linux relies on it, that's a good sign, but surely we shouldn't get
> rid of any existing correction mechanisms.

I think at the very least this new 'reliable tsc' mode must be self
contained, not impact the existing modes, and continue to be switchable via
a boot parameter.

 -- Keir



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