From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Tokarev Subject: Re: Some NCQ numbers... Date: Wed, 04 Jul 2007 20:17:35 +0400 Message-ID: <468BC81F.7090102@msgid.tls.msk.ru> References: <468392CE.6010206@msgid.tls.msk.ru> <20070704154405.GA27166@localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from hobbit.corpit.ru ([81.13.94.6]:22316 "EHLO hobbit.corpit.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752370AbXGDQRh (ORCPT ); Wed, 4 Jul 2007 12:17:37 -0400 In-Reply-To: <20070704154405.GA27166@localdomain> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Dan Aloni Cc: Kernel Mailing List , linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org Dan Aloni wrote: > 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). The next obvious question is: how to check/verify this? /mjt