Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261340AbVEXRMX (ORCPT ); Tue, 24 May 2005 13:12:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261213AbVEXQ7m (ORCPT ); Tue, 24 May 2005 12:59:42 -0400 Received: from diadema.skane.tbv.se ([193.13.139.13]:14055 "EHLO diadema.skane.tbv.se") by vger.kernel.org with ESMTP id S261349AbVEXQxm (ORCPT ); Tue, 24 May 2005 12:53:42 -0400 From: "Oskar Liljeblad" Date: Tue, 24 May 2005 18:53:39 +0200 To: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org Cc: raw@dslr.net Subject: clock drift with 2x Promise Ultra133 TX2 (PDC 20269) (again) Message-ID: <20050524165339.GA16577@oskar> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.9i X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "diadema.skane.tbv.se", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Problem: I have two Promise Ultra133 TX2 (PDC 20269) cards, each with two Maxtor UDMA133 hard drives connected. The system also has another hard drive connected to the motherboard. A total of five drives. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1402 Lines: 41 Problem: I have two Promise Ultra133 TX2 (PDC 20269) cards, each with two Maxtor UDMA133 hard drives connected. The system also has another hard drive connected to the motherboard. A total of five drives. When I concurrently read from two hard drives connected to different Promise cards, there is heavy software clock drift. The software clock runs too fast - approx. a few seconds per minute during this i/o. To reproduce: hwclock --hctosys hwclock --show date dd if=/dev/hde of=/dev/null bs=1M count=7200 & dd if=/dev/hdi of=/dev/null bs=1M count=7200 & wait wait hwclock --show date This doesn't happen if I read from two drives connected to the same card, or one drive connected to the motherboard and one connected to a Promise card. I've removed all other PCI devices in the system - problem remains. I tried different motherboards: Asus A7V266-C with AMD AthlonXP 2000+ (i686) - problem occurs Asus A7V600-X with AMD Sempron 2600+ (i686) - problem occurs Abit KV8 Pro with AMD Athlon64 3000+ (i686) - problem does not occur! So what makes the Abit motherboard different? Regards, Oskar Liljeblad (oskar@osk.mine.nu) - 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/