Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756091AbZCDRec (ORCPT ); Wed, 4 Mar 2009 12:34:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755043AbZCDReW (ORCPT ); Wed, 4 Mar 2009 12:34:22 -0500 Received: from rv-out-0506.google.com ([209.85.198.228]:43933 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754696AbZCDReW (ORCPT ); Wed, 4 Mar 2009 12:34:22 -0500 Message-ID: <49AEBB8C.2000405@codemonkey.ws> Date: Wed, 04 Mar 2009 11:34:04 -0600 From: Anthony Liguori User-Agent: Thunderbird 2.0.0.19 (X11/20090105) MIME-Version: 1.0 To: Jeremy Fitzhardinge CC: Nick Piggin , Xen-devel , Andrew Morton , the arch/x86 maintainers , Linux Kernel Mailing List , "H. Peter Anvin" Subject: Re: [PATCH] xen: core dom0 support References: <1235786365-17744-1-git-send-email-jeremy@goop.org> <200902282309.07576.nickpiggin@yahoo.com.au> <49AB19E1.4050604@goop.org> <200903021737.24903.nickpiggin@yahoo.com.au> <49AB9336.7010103@goop.org> In-Reply-To: <49AB9336.7010103@goop.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 817 Lines: 22 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/