From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268706AbUH3R41 (ORCPT ); Mon, 30 Aug 2004 13:56:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268707AbUH3RwX (ORCPT ); Mon, 30 Aug 2004 13:52:23 -0400 Received: from uucp.cistron.nl ([62.216.30.38]:31910 "EHLO ncc1701.cistron.net") by vger.kernel.org with ESMTP id S268706AbUH3RtZ (ORCPT ); Mon, 30 Aug 2004 13:49:25 -0400 From: "Miquel van Smoorenburg" Subject: Re: HIGHMEM4G config for 1GB RAM on desktop? Date: Mon, 30 Aug 2004 17:49:24 +0000 (UTC) Organization: Cistron Group Message-ID: References: <200408021602.34320.swsnyder@insightbb.com> <20040804120633.4dca57b3.akpm@osdl.org> <411ABF85.2080200@techsource.com> <41336CB1.6030105@techsource.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-Trace: ncc1701.cistron.net 1093888164 22138 62.216.29.200 (30 Aug 2004 17:49:24 GMT) X-Complaints-To: abuse@cistron.nl X-Newsreader: trn 4.0-test76 (Apr 2, 2001) Originator: miquels@cistron-office.nl (Miquel van Smoorenburg) To: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org In article <41336CB1.6030105@techsource.com>, Timothy Miller wrote: >Timothy Miller wrote: >> Hey, that rings a bell. I have a 3ware 7000-2 controller with two >> WD1200JB drives in RAID1. I find that if I dd from the disk, I get >> exactly the read throughput that is the max for the drives (47MB/sec). >> However, if I do a WRITE test, the performance is miserable. >> >> I have been going back and forth with 3ware for months, and what's odd >> is that my drives with my controller in any machine other than the >> primary box get great write throughput, BUT on my main box with 1G of >> RAM, I get MISERABLE write throughput. When I should be getting >> 36MB/sec or faster, I get 8 to 12 MB/sec. >> >> Now, I have tried limiting the memory with a mem= boot option, but that >> doesn't change the performance any. > >Scratch all this. Even if I physically remove half the memory, I STILL >get the performance problem. 3ware eh? Try setting /sys/block/sda/queue/nr_requests to twice the number in /sys/block/sda/device/queue_depth Mike. -- "In times of universal deceit, telling the truth becomes a revolutionary act." -- George Orwell.