Re: [Xen-devel] [RFC] Correct/fast timestamping in apps under Xen [1 of 4]: Reliable TSC

[Tim Deegan <Tim.Deegan@xxxxxxxxxx>]

At 22:07 +0100 on 07 Oct (1254953275), Dan Magenheimer wrote:
> Admittedly, this doesn't guarantee that a multi-socket
> platform obeys invariance, but apparently this
> feature utilizes a crystal available externally
> to the socket so it is easy to leverage in a
> system design to ensure invariance across
> multiple sockets, or even across multiple enclosures
> that are all on a QPI link.  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. 

Tim.

-- 
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Citrix Systems (R&D) Ltd.
[Company #02300071, SL9 0DZ, UK.]

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