From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262283AbVFIGJk (ORCPT ); Thu, 9 Jun 2005 02:09:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262282AbVFIGJk (ORCPT ); Thu, 9 Jun 2005 02:09:40 -0400 Received: from mail.dvmed.net ([216.237.124.58]:28372 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S262280AbVFIGJb (ORCPT ); Thu, 9 Jun 2005 02:09:31 -0400 Message-ID: <42A7DD18.50004@pobox.com> Date: Thu, 09 Jun 2005 02:09:28 -0400 From: Jeff Garzik User-Agent: Mozilla Thunderbird 1.0.2-6 (X11/20050513) X-Accept-Language: en-us, en MIME-Version: 1.0 To: kallol@nucleodyne.com CC: linux-kernel@vger.kernel.org, "linux-ide@vger.kernel.org" Subject: Re: Performance figure for sx8 driver References: <20050608212425.8951j70kxbwpcs8c@www.nucleodyne.com> In-Reply-To: <20050608212425.8951j70kxbwpcs8c@www.nucleodyne.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org kallol@nucleodyne.com wrote: > Does anyone have performace figure for sx8 driver which is for promise SATAII150 > 8 port PCI-X adapter? > > Someone reports that on a platform with sx8 driver, multiple hdparms on > different disks those are connected to the same adapter (there are 8 ports) can > not get more than 45MB/sec in total, whereas a SCSI based driver for the same > adapter gets around 150MB/sec. > > Any comment on this? Known. Early firmwares for SX8 had problems that forced the driver to limit the number of outstanding requests, for all ports, to _one_. Later firmwares have fixed this, but the driver has not been updated to detect newer(fixed) firmwares. You may update drivers/block/sx8.c as such: - CARM_MAX_Q = 1, /* one command at a time */ + CARM_MAX_Q = 30, /* 30 commands at a time */ if you have a newer firmware, to obtain much better performance. Jeff