Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751759AbdGaTSQ (ORCPT ); Mon, 31 Jul 2017 15:18:16 -0400 Received: from terminus.zytor.com ([65.50.211.136]:42811 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751718AbdGaTSP (ORCPT ); Mon, 31 Jul 2017 15:18:15 -0400 Subject: Re: [PATCH] efifb: allow user to disable write combined mapping. To: Dave Airlie , Linus Torvalds Cc: Peter Jones , the arch/x86 maintainers , Dave Airlie , Bartlomiej Zolnierkiewicz , "linux-fbdev@vger.kernel.org" , Linux Kernel Mailing List , Andrew Lutomirski References: <20170718060909.5280-1-airlied@redhat.com> <20170718143404.omgxrujngj2rhiya@redhat.com> From: "H. Peter Anvin" Message-ID: <487000e3-afeb-0e59-c563-0ef4b1347d8d@zytor.com> Date: Mon, 31 Jul 2017 12:13:32 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 287 Lines: 10 On 07/18/17 13:44, Dave Airlie wrote: > > In normal operation the console is faster with _wc. It's the side effects > on other cores that is the problem. > I'm guessing leaving these as UC- rate-limits them so it doesn't interfere with the I/O operations on the other cores... -hpa