Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761983AbXHUSoe (ORCPT ); Tue, 21 Aug 2007 14:44:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758593AbXHUSo1 (ORCPT ); Tue, 21 Aug 2007 14:44:27 -0400 Received: from moutng.kundenserver.de ([212.227.126.186]:57895 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758393AbXHUSo0 (ORCPT ); Tue, 21 Aug 2007 14:44:26 -0400 From: Bodo Eggert <7eggert@gmx.de> Subject: Re: Software based ECC ? To: Folkert van Heusden , Valdis.Kletnieks@vt.edu, roland , linux-kernel@vger.kernel.org Reply-To: 7eggert@gmx.de Date: Tue, 21 Aug 2007 20:44:01 +0200 References: <8QK3R-kc-9@gated-at.bofh.it> <8QSuw-4J2-9@gated-at.bofh.it> <8RoXy-3NJ-13@gated-at.bofh.it> User-Agent: KNode/0.7.2 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8Bit Message-Id: X-be10.7eggert.dyndns.org-MailScanner-Information: See www.mailscanner.info for information X-be10.7eggert.dyndns.org-MailScanner: Found to be clean X-be10.7eggert.dyndns.org-MailScanner-From: 7eggert@gmx.de X-Provags-ID: V01U2FsdGVkX19PA7WmRTDCs3JW2++YGIGogQN4tkOX3JWfdPC T9tA7RrZo4U5zpLeMW36Lzrz8vh4Nh+YP38/TuGAmsaPNi/a1Y jFiG00FIybqlAkmQR7BzQ== Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1115 Lines: 24 Folkert van Heusden wrote: >> > http://pdos.csail.mit.edu/papers/softecc:ddopson-meng softecc_ddopson-meng.pdf >> > "SoftECC : A System for Software Memory Integrity Checking" >> >> Personally, I'd recommend just shelling out the bucks for hardware ECC if >> the reliability matters. > > a question and an idea: Q: is ecc guaranteed to detect all bitflips? It's guaranteed not to. Having n extra bits, you can detect n-bit-flips and correct n/2-bit-flips (provided you use an optimal code). These extra bits can flip, too, so if you have m >= 1 data bits and any finite number n of extra bits, it's possible to have an undetectable n+1-bit-flip. -- If you can't remember, then the claymore IS pointed at you. Fri?, Spammer: W@2fzbe.7eggert.dyndns.org k@-.7eggert.dyndns.org Rtc@Ytzq.7eggert.dyndns.org 9qKSiPo@ZesTis.7eggert.dyndns.org - 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/