From owner-freebsd-questions@FreeBSD.ORG Mon Apr 27 13:56:46 2015 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id BAFCD962 for ; Mon, 27 Apr 2015 13:56:46 +0000 (UTC) Received: from mail-wi0-x234.google.com (mail-wi0-x234.google.com [IPv6:2a00:1450:400c:c05::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 5D5E217CE for ; Mon, 27 Apr 2015 13:56:46 +0000 (UTC) Received: by widdi4 with SMTP id di4so90931641wid.0 for ; Mon, 27 Apr 2015 06:56:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=from:to:date:mime-version:subject:message-id:priority:content-type :content-transfer-encoding:content-description; bh=Ks/03blbh5X0kjeUDouJdYeLJQr7JyyLpiBlVBJyjcU=; b=uqxy/zFqy+jUAKVpw4xyWso3byjXmb1TOF0lwe2bTjpzSprTHQJ+44/O7IOjanpH4h 6tMyEi9yP0vqAVwSp4mjE5H0kfPfSeKzyhddxcgQM0lR/w0WJf7EYtJ75Iu0gNP1rWC8 J9Q2RSx0YcKmwltD2URDAgLSh8ywU2/7GzWAqFKHc9t2jUJYo49CZOIiDi/CJxm/DviN dMmTLk+VJiIJzi3NwcE6pQ+hgBzUsoDpQOVUWyv7va/J//nBQ0yupTjdTxr8HbZffrsP CE63Wm3urEXeq7f+nXo02Pq41/FlGo/NX6eRuzMQv8Ew+LbszPlUHhEIPbyj7vDXGMOG U3XA== X-Received: by 10.180.208.84 with SMTP id mc20mr21074492wic.38.1430143004551; Mon, 27 Apr 2015 06:56:44 -0700 (PDT) Received: from [192.168.16.97] ([217.41.35.220]) by mx.google.com with ESMTPSA id gj7sm11772667wib.4.2015.04.27.06.56.42 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Mon, 27 Apr 2015 06:56:43 -0700 (PDT) From: "Dave B" To: freebsd-questions@freebsd.org Date: Mon, 27 Apr 2015 14:56:42 +0100 MIME-Version: 1.0 Subject: Re: Debugging bad memory problems Message-ID: <553E401A.6119.163DF7C@g8kbvdave.googlemail.com> Priority: normal X-mailer: Pegasus Mail for Windows (4.62) Content-type: text/plain; charset=ISO-8859-1 Content-transfer-encoding: Quoted-printable Content-description: Mail message body X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 27 Apr 2015 13:56:46 -0000 On 26 Apr 2015 at 23:05, Fernando Apestegu=EDa wrote: > I booted from a memtest CD-ROM. It passed a couple of tests fine and > then it rebooted while doing a "bit fade" test at around 93%. > Removing the modules is tricky since this laptop has screws all > around in dark corners (even removing the battery needs a screw > driver). I will try to limit physical memory with hw.physmem and see > if it makes any difference. > > Thanks! > Check for CPU cooling problems too, such as an obstructed cooler or grumbl= y fan. (Also if you can, check for bad power supply issues.) Older AMD CPU's don't take kindly at all to running too hot, unlike some I= ntel devices that will start to cycle skipping to lower the disipation, just sl= owing down in effect. "Supliment the cooling" when running such tests, RAM can disipate quite a = bit of power when worked hard (as Memtest86 does.) Elevate the laptop and waft = air under it, but not in such a way as to oppose it's own intended airflow. Hope you find the trouble. Dave B.