linux-kernel - Re: Some NCQ numbers...

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Message-ID: <20070704154405.GA27166@localdomain>
Date:	Wed, 4 Jul 2007 18:44:05 +0300
From:	Dan Aloni <da-x@...atomic.org>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: Some NCQ numbers...

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
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