Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754912AbXLVUzt (ORCPT ); Sat, 22 Dec 2007 15:55:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752933AbXLVUzl (ORCPT ); Sat, 22 Dec 2007 15:55:41 -0500 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:45445 "EHLO amd.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752900AbXLVUzk (ORCPT ); Sat, 22 Dec 2007 15:55:40 -0500 Date: Sat, 22 Dec 2007 21:54:32 +0100 From: Pavel Machek To: David Newall Cc: Richard D , "'Matthew Bloch'" , linux-kernel@vger.kernel.org Subject: Re: Testing RAM from userspace / question about memmap= arguments Message-ID: <20071222205432.GA2221@elf.ucw.cz> References: <20071221125812.GA4052@ucw.cz> <000001c84472$74b245e0$5e16d1a0$@com> <20071222134612.GA4098@ucw.cz> <476D35F6.90900@davidnewall.com> <20071222184759.GB31809@elf.ucw.cz> <476D756A.6060507@davidnewall.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <476D756A.6060507@davidnewall.com> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.16 (2007-06-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1480 Lines: 41 On Sun 2007-12-23 07:06:58, David Newall wrote: > Pavel Machek wrote: >> memtest has following problems: >> >> 0) it is kind of hard to run memtest over ssh >> > > It's kind of hard to run anything over SSH if it has to be run before > userspace is up. But the kernel can collect results from a modified > memtest, after it chains back. memtest can be ran from userspace, that's the point. >> 1) if linux fixes some problem with PCI quirk or microcode >> upload, memtest will not see the fix >> > > What are you saying? Linux is going to fix faulty RAM? Yes, that's what CPU microcode update is for. And I want to test my RAM with up-to-date microcode. >> 2) if memory only fails while something else happens (DMA to >> other piece of memory? Hard disk load glitching powre >> supply?), memtest will not see the problem. > > These are not RAM faults. The very last thing you want is evidence that > you've got a faulty piece of RAM when the fault is actually a hard disk > glitch! No, it may be power supply leading to RAM problems. Yes, I want to detect that. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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/