From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Aloni Subject: Re: Some NCQ numbers... Date: Wed, 4 Jul 2007 18:44:05 +0300 Message-ID: <20070704154405.GA27166@localdomain> References: <468392CE.6010206@msgid.tls.msk.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <468392CE.6010206@msgid.tls.msk.ru> Sender: linux-kernel-owner@vger.kernel.org To: Michael Tokarev Cc: Kernel Mailing List , linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org List-Id: linux-ide@vger.kernel.org On Thu, Jun 28, 2007 at 02:51:58PM +0400, Michael Tokarev wrote: >[..] > Test machine was using MPTSAS driver for the following card: > SCSI storage controller: LSI Logic / Symbios Logic SAS1064E PCI-Express Fusion-MPT SAS (rev 02) > > Pretty similar results were obtained on an AHCI controller: > SATA controller: Intel Corporation 82801GR/GH (ICH7 Family) Serial ATA Storage Controller AHCI (rev 01) > on another machines. Are you sure that NCQ was enabled between the controller and drive? Did you verify this? I know about some versions that disable NCQ support internally in their firmware (something to do with bugs in error handling). -- Dan Aloni XIV LTD, http://www.xivstorage.com da-x (at) monatomic.org, dan (at) xiv.co.il