From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756443Ab3J1Key (ORCPT ); Mon, 28 Oct 2013 06:34:54 -0400 Received: from terminus.zytor.com ([198.137.202.10]:56878 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756004Ab3J1Kex (ORCPT ); Mon, 28 Oct 2013 06:34:53 -0400 User-Agent: K-9 Mail for Android In-Reply-To: <20131028102938.GD4314@pd.tnic> References: <1382878525-3410-1-git-send-email-wernerandy@gmx.de> <20131027133401.GB24817@pd.tnic> <20131027165159.GD1617@thinkpad.fritz.box> <20131027173131.GC21868@pd.tnic> <20131027175608.GA1340@thinkpad.fritz.box> <20131027190148.GD21868@pd.tnic> <20131028062946.GA1391@thinkpad.fritz.box> <20131028101749.GA4389@gmail.com> <20131028102938.GD4314@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: Re: [PATCH] X86: MM: Add PAT Type write-through in combination with mtrr From: "H. Peter Anvin" Date: Mon, 28 Oct 2013 03:31:58 -0700 To: Borislav Petkov , Ingo Molnar CC: Andreas Werner , tglx@linutronix.de, mingo@redhat.com, x86@kernel.org, dave@linux.vnet.ibm.com, linux-kernel@vger.kernel.org Message-ID: <9f8cb8da-e453-464a-8c95-9d06b58ad613@email.android.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sort of; the writes combine in the cache. Borislav Petkov wrote: >On Mon, Oct 28, 2013 at 11:17:49AM +0100, Ingo Molnar wrote: >> And regular write-back cacheable isn't sufficient because the CPU >> could do things like prefetch your range automatically? > >Yeah, he's doing a CLFLUSH anyway which basically makes it a >write-through... -- Sent from my mobile phone. Please pardon brevity and lack of formatting.