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

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Message-ID: <20070704164426.GA8061@localdomain>
Date:	Wed, 4 Jul 2007 19:44:26 +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 Wed, Jul 04, 2007 at 08:17:35PM +0400, Michael Tokarev wrote:
> 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?

On the lowest level, it's possible using a protocol analyzer. If you 
don't have one, you need to be familiar with the controller's driver 
or its firmware. If the driver is based on libata, I think it's 
possible to get this information easier. Otherwise, such as in the 
case of mptsas, it can be completely hidden by the firmware.

-- 
Dan Aloni
XIV LTD, http://www.xivstorage.com
da-x (at) monatomic.org, dan (at) xiv.co.il
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