Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754282AbYJPH1y (ORCPT ); Thu, 16 Oct 2008 03:27:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751520AbYJPH1q (ORCPT ); Thu, 16 Oct 2008 03:27:46 -0400 Received: from vpn.id2.novell.com ([195.33.99.129]:3355 "EHLO vpn.id2.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751511AbYJPH1p convert rfc822-to-8bit (ORCPT ); Thu, 16 Oct 2008 03:27:45 -0400 Message-Id: <48F70941.76E4.0078.0@novell.com> X-Mailer: Novell GroupWise Internet Agent 8.0.0 Beta Date: Thu, 16 Oct 2008 08:28:33 +0100 From: "Jan Beulich" To: "Jeremy Fitzhardinge" Cc: "xen-devel@lists.xensource.com" , "Chris Lalancette" , Subject: Re: [Xen-devel] [PATCH]: Fix Xen domU boot with batched mprotect References: <48F5CE10.3060403@redhat.com> <48F6274D.76E4.0078.0@novell.com> <48F61919.2050005@goop.org> In-Reply-To: <48F61919.2050005@goop.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8BIT Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 749 Lines: 18 >>> Jeremy Fitzhardinge 15.10.08 18:23 >>> >> But >> performance-wise, CONFIG_HIGHPTE sucks under Xen anyway, so you'd >> better not turn this on in the first place. We may want/need to provide >> a means to disable this at run time so the same kernel when run natively >> could still make use of it, but without impacting performance under Xen. >> > >That's a secondary issue. What's the source of the performance hit? >Just all the extra kmap_atomic operations? Yes, afaict. -- 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/