linux-kernel - Re: [PATCH] xen: core dom0 support

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Message-ID: <49AEBB8C.2000405@codemonkey.ws>
Date:	Wed, 04 Mar 2009 11:34:04 -0600
From:	Anthony Liguori <anthony@...emonkey.ws>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Nick Piggin <nickpiggin@...oo.com.au>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] xen: core dom0 support

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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