Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261728AbVEBT2s (ORCPT ); Mon, 2 May 2005 15:28:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261725AbVEBT2s (ORCPT ); Mon, 2 May 2005 15:28:48 -0400 Received: from diadema.skane.tbv.se ([193.13.139.13]:14236 "EHLO diadema.skane.tbv.se") by vger.kernel.org with ESMTP id S261724AbVEBT2p (ORCPT ); Mon, 2 May 2005 15:28:45 -0400 From: "Oskar Liljeblad" Date: Mon, 2 May 2005 21:28:43 +0200 To: linux-ide@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: clock drift with two Promise Ultra133 TX2 (PDC 20269) cards Message-ID: <20050502192843.GA3367@oskar> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.6+20040907i 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: I'm running 2.6.11.8 on an server with two Promise Ultra133 TX2 (PDC20269) PCI cards, same hardware revision (judging from stickers on the cards). I'm using the CONFIG_BLK_DEV_PDC202XX_NEW driver. Each card has two connected hard drives. Whenever I read from a disk on one of the cards (e.g. using 'dd if=/dev/hdX of=/dev/null bs=1M'), and at the same time read from a disk on the other card, there is heavy software clock drift. It drifts about 2-5 seconds per minute. [...] 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: 944 Lines: 18 I'm running 2.6.11.8 on an server with two Promise Ultra133 TX2 (PDC20269) PCI cards, same hardware revision (judging from stickers on the cards). I'm using the CONFIG_BLK_DEV_PDC202XX_NEW driver. Each card has two connected hard drives. Whenever I read from a disk on one of the cards (e.g. using 'dd if=/dev/hdX of=/dev/null bs=1M'), and at the same time read from a disk on the other card, there is heavy software clock drift. It drifts about 2-5 seconds per minute. This does not happen if I read from two drives connected on the same card, or if I read from a drive connected to the motherboard IDE (VIA vt8233a) and a drive on either of the Promise cards. 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/