From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S271256AbTGQUwF (ORCPT ); Thu, 17 Jul 2003 16:52:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S271289AbTGQUwF (ORCPT ); Thu, 17 Jul 2003 16:52:05 -0400 Received: from kinesis.swishmail.com ([209.10.110.86]:59396 "HELO kinesis.swishmail.com") by vger.kernel.org with SMTP id S271256AbTGQUwC (ORCPT ); Thu, 17 Jul 2003 16:52:02 -0400 Message-ID: <3F1711B5.9020800@techsource.com> Date: Thu, 17 Jul 2003 17:14:29 -0400 From: Timothy Miller User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Linux Kernel Mailing List Subject: [OT??] HELP: Getting lousy memory throughput from Abit KD7 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I recently bought an Abit KD7, and I'm having a few problems with it. I hope someone can please help me with them. According to the BIOS screen, the board model I have is KT400-8235-6A6LYA1AC-DN. I have an Athlon XP 2800+ (barton core, 333mhz fsb) with 1 GIG of PC2700 DDR. The board has AwardBIOS. I'm running Red Hat 9 with their latest kernel (something like 2.4.20-18). The Corsair memory I'm using turns out to be from SpecTek, which uses Micron silicon. I called SpecTek to get a datasheet, and they directed me to the data sheet for Micron MT46V64M4TG-6T. I use the following settings for memory: CAS latency: 2.5 Bank Interleave: 4 Trp: 3T Tras: 7T Trcd: 3T Drive strength and controls are all Auto DRAM Access: 3T Enhance DRAM Performance: Disabled DRAM Command Rate: 1T Write Recovery Time: 3T tWTR: 1T The problem that I encounter is that I seem to be getting unusually low memory throughput. Using "memtest86", I get 665mb/sec. Using STREAM under Linux, I get closer to 1040 mb/sec peak. Doing some searches on google has revealed that most people get closer to their peak bandwidth, so, I should be expecting at least 2400 from STREAM, judging from the numbers others are getting. I know in the real world, you never get peak, but in synthetic tests, I should not be getting half the rated bandwidth. I have already tried flashing the latest BIOS but the only result was that "Fast CPU command decode" option now causes the system to not POST (It didn't before). If anyone could please help me to figure out what is slowing things down, I would appreciate it very much. I have a feeling this isn't a Linux-related issue, but you never know. Does STREAM report very low throughput compares to, say, SiSOFT SANDRA? I haven't tried SANDRA because I don't want to install Windows. Thank you.