From owner-freebsd-amd64@FreeBSD.ORG Fri Aug 19 10:48:36 2005 Return-Path: X-Original-To: freebsd-amd64@freebsd.org Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1CAE416A41F for ; Fri, 19 Aug 2005 10:48:36 +0000 (GMT) (envelope-from bkoenig@cs.tu-berlin.de) Received: from efacilitas.de (smtp.efacilitas.de [85.10.196.108]) by mx1.FreeBSD.org (Postfix) with ESMTP id ADA0E43D55 for ; Fri, 19 Aug 2005 10:48:35 +0000 (GMT) (envelope-from bkoenig@cs.tu-berlin.de) Received: from eurystheus.local (port-212-202-37-251.dynamic.qsc.de [212.202.37.251]) by efacilitas.de (Postfix) with ESMTP id 0902E4AFA9; Fri, 19 Aug 2005 12:54:37 +0200 (CEST) Received: from [192.168.1.67] (eurystheus.local [192.168.1.67]) by eurystheus.local (Postfix) with ESMTP id 1717F19345F; Fri, 19 Aug 2005 12:48:20 +0200 (CEST) Message-ID: <4305B8F3.7080904@cs.tu-berlin.de> Date: Fri, 19 Aug 2005 12:48:19 +0200 From: =?ISO-8859-1?Q?Bj=F6rn_K=F6nig?= User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.8) Gecko/20050517 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Vasim Valejev References: <00d601c5a88e$1cb8c260$2107a8c0@vasimwork> In-Reply-To: <00d601c5a88e$1cb8c260$2107a8c0@vasimwork> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Cc: freebsd-amd64@freebsd.org Subject: Re: Slow PCI-X controller perfomance (adaptec 2130SLP) X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Aug 2005 10:48:36 -0000 Vasim Valejev wrote: > I've tried to set up FreeBSD-current on Dual opteron box with Adaptec 2130SLP > PCI-X RAID controller (256MB memory). My tests did show that maximum transfer > rate from controller to OS was about 132MB/s. That is very strange since PCI-X > maximum speed should be about 1GB/s. Why the controller was so slow? [...] 132 MB/s is a very good transfer rate. Keep in mind that 1 GB/s is the theoretical limit of the PCI-X bus which means that single devices do not necessarily accomplish this transfer rate. As far as I can remember the maximum read transfer rate of a RAID 5 is n - 1, i.e. if one drive has a maximum transfer rate of 80 MB/s then three of them in a RAID 5 array can't have more than 160 MB/s. Björn