Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750965AbVLIBw5 (ORCPT ); Thu, 8 Dec 2005 20:52:57 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750980AbVLIBw5 (ORCPT ); Thu, 8 Dec 2005 20:52:57 -0500 Received: from mail.dvmed.net ([216.237.124.58]:54956 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S1750961AbVLIBw4 (ORCPT ); Thu, 8 Dec 2005 20:52:56 -0500 Message-ID: <4398E364.6050605@pobox.com> Date: Thu, 08 Dec 2005 20:52:36 -0500 From: Jeff Garzik User-Agent: Mozilla Thunderbird 1.0.7-1.1.fc4 (X11/20050929) X-Accept-Language: en-us, en MIME-Version: 1.0 To: "Alexander E. Patrakov" CC: Andrew Morton , linux-kernel@vger.kernel.org, Alan Cox Subject: Re: 2.6.15-rc5-mm1 References: <20051204232153.258cd554.akpm@osdl.org> <4398D967.4020309@ums.usu.ru> In-Reply-To: <4398D967.4020309@ums.usu.ru> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.1 (/) X-Spam-Report: Spam detection software, running on the system "srv2.dvmed.net", 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: Alexander E. Patrakov wrote: > Andrew Morton wrote: > >> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.15-rc5/2.6.15-rc5-mm1/ >> > > > I just noticed (maybe too late) that this kernel has the "pata_via" > driver and decided to try it. It works here, but has one drawback: it is > slower than the old "via82cxxx" IDE driver. > > My configuration with the via82cxxx driver: > > /dev/hda = disk, QUANTUM FIREBALLlct20 > Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1 > > /dev/hdb = SAMSUNG CD-ROM SC-148F > Drive is old, supports only mdma2 > > There are also /dev/hdc and /dev/hdd, irrelevant here. > > With the via82cxxx driver, I can get speed around 20 MB/s from /dev/hda. > The pata_via driver downgrades this to 7 MB/s because it needlessly > drops the disk to MWDMA2 mode. [...] Content analysis details: (0.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.1 RCVD_IN_SORBS_DUL RBL: SORBS: sent directly from dynamic IP address [69.134.188.146 listed in dnsbl.sorbs.net] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1302 Lines: 39 Alexander E. Patrakov wrote: > Andrew Morton wrote: > >> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.15-rc5/2.6.15-rc5-mm1/ >> > > > I just noticed (maybe too late) that this kernel has the "pata_via" > driver and decided to try it. It works here, but has one drawback: it is > slower than the old "via82cxxx" IDE driver. > > My configuration with the via82cxxx driver: > > /dev/hda = disk, QUANTUM FIREBALLlct20 > Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1 > > /dev/hdb = SAMSUNG CD-ROM SC-148F > Drive is old, supports only mdma2 > > There are also /dev/hdc and /dev/hdd, irrelevant here. > > With the via82cxxx driver, I can get speed around 20 MB/s from /dev/hda. > The pata_via driver downgrades this to 7 MB/s because it needlessly > drops the disk to MWDMA2 mode. That's expected, as libata currently limits all drives on a bus to the maximum speed of the slowest drive. That's needed by some controllers, but not all. I'm pretty sure Alan plans to fix that (at least ISTR him mentioning it). Jeff - 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/