Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759530AbYAJKFa (ORCPT ); Thu, 10 Jan 2008 05:05:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755334AbYAJKFK (ORCPT ); Thu, 10 Jan 2008 05:05:10 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:36445 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754181AbYAJKFI (ORCPT ); Thu, 10 Jan 2008 05:05:08 -0500 Date: Thu, 10 Jan 2008 11:04:43 +0100 From: Ingo Molnar To: Andi Kleen Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , "H. Peter Anvin" , Venki Pallipadi , suresh.b.siddha@intel.com, Arjan van de Ven , Dave Jones Subject: Re: CPA patchset Message-ID: <20080110100443.GB28209@elte.hu> References: <20080103424.989432000@suse.de> <20080110093126.GA360@elte.hu> <20080110095337.GK25945@bingen.suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080110095337.GK25945@bingen.suse.de> User-Agent: Mutt/1.5.17 (2007-11-01) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 736 Lines: 19 * Andi Kleen wrote: > > WBINVD isnt particular fast (takes a few msecs), but why is that a > > problem? Drivers dont do high-frequency ioremap-ing. It's > > typically only done at driver/device startup and that's it. > > Actually graphics drivers can do higher frequency allocation of WC > memory (with PAT) support. but that's not too smart: why dont they use WB plus cflush instead? ioremap() will always be slow and we dont care about stupid uses of it. Ingo -- 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/