Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753963Ab2FKLGc (ORCPT ); Mon, 11 Jun 2012 07:06:32 -0400 Received: from bar.sig21.net ([80.81.252.164]:37391 "EHLO bar.sig21.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752619Ab2FKLGa (ORCPT ); Mon, 11 Jun 2012 07:06:30 -0400 Date: Mon, 11 Jun 2012 13:05:57 +0200 From: Johannes Stezenbach To: Borislav Petkov Cc: Boszormenyi Zoltan , linux-kernel@vger.kernel.org, Andreas Herrmann Subject: Re: AMD FX CPU bug, not fixed by latest microcode? Message-ID: <20120611110557.GA4599@sig21.net> References: <4FD4F45D.5050103@pr.hu> <20120611084318.GA1685@liondog.tnic> <20120611094905.GA10349@liondog.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120611094905.GA10349@liondog.tnic> User-Agent: Mutt/1.5.21 (2010-09-15) X-Spam-21-Score: -2.9 (--) X-Spam-21-Report: No, score=-2.9 required=8.0 tests=ALL_TRUSTED=-1,BAYES_00=-1.9 autolearn=ham Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1573 Lines: 36 On Mon, Jun 11, 2012 at 11:49:05AM +0200, Borislav Petkov wrote: > On Mon, Jun 11, 2012 at 10:43:18AM +0200, Borislav Petkov wrote: > > On Sun, Jun 10, 2012 at 09:24:13PM +0200, Boszormenyi Zoltan wrote: > > > I have an AMD FX-8120 boxed CPU in an ASUS M5A99X-EVO mainboard > > > with 32GB DDR3/1600 memory, running Fedora 17, upgraded from 16. > > > memtest86+ show no problems. > > Ohe other thing: if there's an option in the BIOS to disable the IOMMU, > can you do that and try reproducing the issue with IOMMU disabled? Maybe not related, but I had bad memory in my Intel Core-i5 based system some months ago which resulted in rare crashes, usually manifested itself as g++ ICEs when compiling a mid-sized C++ project -- compiling a kernel with make -p4 showed no problem. Also memtest86+ didn't show the issue, so I tried memtest86-4.0a which claims to find more errors due to SMP support. An overnight run left me with a screen full of garbage and a crashed memtest86-4.0. I replaced the RAM anyway and the box was stable since then. memtest86-4.0a is at http://memtest86.com/ The page claims: With a single CPU it is not possible to drive multi-channel memory controllers at full speed making it impossible to detect some types of errors Maybe someone knowledgable could comment if this is true. Johannes -- 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/