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Re: [Xen-devel] Xen 4.3 development update

At 17:41 +0100 on 03 May (1367602895), George Dunlap wrote:
> winxp boots fairly slowly; nearly doubles in speed for 4.2, and gets 
> even worse for xen-unstable.  The patch is a measurable improvement, but 
> still nowhere near 4.1, or even 4.2.

Ergh. :(

> On the whole however -- I'm not sure that boot time by itself is a 
> blocker.  If the problem really is primarily the "eager TPR" issue for 
> Windows XP, then I'm not terribly motivated either: the Citrix PV 
> drivers patch Windows XP to modify the routine to be lazy (like w2k3); 
> there is hardware available which allows the TPR to be virtualized;

One reason I was chasing this is that the AMD hardware acceleration for
TPR (via the CR8 register) needs software changes in the OS to make
use of it (which XP doesn't have).  The Intel acceleration works fine


> and 
> there are plenty of Windows-based OSes available which do not have this 
> problem.

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