[Xen-devel] Re: [PATCH] xen: core dom0 support

[Anthony Liguori <anthony@xxxxxxxxxxxxx>]

Jeremy Fitzhardinge wrote:
> Nick Piggin wrote:
> It really depends on the workload.  There's three cases to consider: 
> software shadow pagetables, hardware nested pagetables, and Xen direct 
> pagetables.  Even now, Xen's (highly optimised) shadow pagetable code 
> generally out-performs modern nested pagetables, at least when running 
> Windows (for which that code was most heavily tuned).
Can you point to benchmarks?  I have a hard time believing this.

How can shadow paging beat nested paging assuming the presence of large 
pages?
Regards,

Anthony Liguori

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