Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261589AbVECOWS (ORCPT ); Tue, 3 May 2005 10:22:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261572AbVECOVH (ORCPT ); Tue, 3 May 2005 10:21:07 -0400 Received: from firewall.miltope.com ([208.12.184.221]:49706 "EHLO smtp.miltope.com") by vger.kernel.org with ESMTP id S261610AbVECOSY convert rfc822-to-8bit (ORCPT ); Tue, 3 May 2005 10:18:24 -0400 X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Subject: RE: clock drift with two Promise Ultra133 TX2 (PDC 20269) cards Date: Tue, 3 May 2005 09:18:58 -0500 Message-ID: <66F9227F7417874C8DB3CEB057727417045146@MILEX0.Miltope.local> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: clock drift with two Promise Ultra133 TX2 (PDC 20269) cards Thread-Index: AcVPTT5SbPXilsQYQMqO31c0dBm7kQAnKCyQ From: "Drew Winstel" To: "Oskar Liljeblad" , Cc: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1579 Lines: 42 Hello, >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) Just to verify your setup: You have a total of four hard drives connected to your PDC20269, hde, hdg, hdi, and hdk, correct? Are all four drives running in DMA mode? Please post the output of lspci -vv and hdparm run on each of the four hard drives. Also, you may want to try downloading and using Albert Lee's pata_pdc2027x driver (part of libata-dev-2.6 tree). See info at my thread from earlier: http://marc.theaimsgroup.com/?l=linux-ide&m=110902518625384&w=2 Download the latest libata-dev patch set at http://www.kernel.org/pub/linux/kernel/people/jgarzik/libata/ Hope this gets you started. Drew - 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/