From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754220AbbAETXm (ORCPT ); Mon, 5 Jan 2015 14:23:42 -0500 Received: from 251.110.2.81.in-addr.arpa ([81.2.110.251]:60883 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753225AbbAETXl (ORCPT ); Mon, 5 Jan 2015 14:23:41 -0500 Date: Mon, 5 Jan 2015 19:23:29 +0000 From: One Thousand Gnomes To: Pavel Machek Cc: Mark Seaborn , kernel list , luto@amacapital.net Subject: Re: DRAM unreliable under specific access patern Message-ID: <20150105192329.5f32c155@lxorguk.ukuu.org.uk> In-Reply-To: <20141224220818.GA17655@amd> References: <20141224220818.GA17655@amd> Organization: Intel Corporation X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.24; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > In the meantime, I created test that actually uses physical memory, > 8MB apart, as described in some footnote. It is attached. It should > work, but it needs boot with specific config options and specific > kernel parameters. Why not just use hugepages. You know the alignment guarantees for 1GB pages and that means you don't even need to be root In fact - should we be disabling 1GB huge page support by default at this point, at least on non ECC boxes ? Alan