From owner-freebsd-hackers Thu Nov 11 1: 5:35 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from Thingol.KryptoKom.DE (Thingol.KryptoKom.DE [194.245.91.1]) by hub.freebsd.org (Postfix) with ESMTP id 37AAB15453 for ; Thu, 11 Nov 1999 01:05:30 -0800 (PST) (envelope-from eT@post.com) Received: (from root@localhost) by Thingol.KryptoKom.DE (8.9.1/8.9.1) id KAA32051 for ; Thu, 11 Nov 1999 10:01:15 +0100 Received: from cirdan.kryptokom.de by KryptoWall via smtpp (Version 1.2.0) id kwa32039; Thu Nov 11 10:00:53 1999 Received: from post.com (Mbeki.KryptoKom.DE [192.168.6.249]) by cirdan.kryptokom.de (8.9.3/8.8.8) with ESMTP id KAA05519 for ; Thu, 11 Nov 1999 10:05:11 +0100 Message-ID: <382A86B8.915EC497@post.com> Date: Thu, 11 Nov 1999 10:04:57 +0100 From: eT X-Mailer: Mozilla 4.7 [en] (X11; I; FreeBSD 3.1-RELEASE i386) X-Accept-Language: en MIME-Version: 1.0 To: freebsd-hackers@freebsd.org Subject: One bit error on BUS? Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG What could the possible explanation be in the following scenario: We have: arbitrary chip <---localbus---> pci controller <===pcibus===> BX Motherboard <------> RAM And somewhere in the transfer of blocks of data between the chip (on the left) and the RAM on the right we have random one bit errors. we means that for huge streams of transfer all might be ok and at random intervals exactely one bit will be set incorrectly (not always the same bit in the byte). We have a 440BX motherboard with a PII400. Is it a timing problem on data transfer on the local bus or pci bus? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message