Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758052AbZFIR7z (ORCPT ); Tue, 9 Jun 2009 13:59:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751567AbZFIR7s (ORCPT ); Tue, 9 Jun 2009 13:59:48 -0400 Received: from terminus.zytor.com ([198.137.202.10]:53692 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751537AbZFIR7r (ORCPT ); Tue, 9 Jun 2009 13:59:47 -0400 Message-ID: <4A2E7B40.4070608@zytor.com> Date: Tue, 09 Jun 2009 08:09:52 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Ingo Molnar CC: Nick Piggin , Linus Torvalds , Rusty Russell , Jeremy Fitzhardinge , Thomas Gleixner , Linux Kernel Mailing List , Andrew Morton , Peter Zijlstra , Avi Kivity , Arjan van de Ven Subject: Re: [benchmark] 1% performance overhead of paravirt_ops on native kernels References: <4A0B62F7.5030802@goop.org> <200906032208.28061.rusty@rustcorp.com.au> <200906041554.37102.rusty@rustcorp.com.au> <20090609093918.GC16940@wotan.suse.de> <20090609111719.GA4463@elte.hu> In-Reply-To: <20090609111719.GA4463@elte.hu> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 933 Lines: 24 Ingo Molnar wrote: > > OTOH, highmem is clearly a useful hardware enablement feature with a > slowly receding upside and a constant downside. The outcome is > clear: when a critical threshold is reached distros will stop > enabling it. (or more likely, there will be pure 64-bit x86 distros) > A major problem is that distros don't seem to be willing to push 64-bit kernels for 32-bit distros. There are a number of good (and not-so-good) reasons why users may want to run a 32-bit userspace, but not running a 64-bit kernel on capable hardware is just problematic. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- 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/