linux-kernel - Re: [PATCH v2] PCI: Add support for turning PCIe ECRC on or off

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Message-ID: <20090406114448.1403297f@hobbes>
Date:	Mon, 6 Apr 2009 11:44:48 -0700
From:	Jesse Barnes <jesse.barnes@...el.com>
To:	Andrew Patterson <andrew.patterson@...com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	jbarnes@...tuousgeek.org
Subject: Re: [PATCH v2] PCI: Add support for turning PCIe ECRC on or off

On Fri, 03 Apr 2009 16:01:36 -0600
Andrew Patterson <andrew.patterson@...com> wrote:

> PCI: Add support for turning PCIe ECRC on or off
> 
> Adds support for PCI Express transaction layer end-to-end CRC checking
> (ECRC).  This patch will enable/disable ECRC checking by
> setting/clearing the ECRC Check Enable and/or ECRC Generation Enable
> bits for devices that support ECRC.
> 
> The ECRC setting is controlled by the "pci=ecrc=<policy>" command-line
> option. If this option is not set or is set to 'bios", the enable and
> generation bits are left in whatever state that firmware/BIOS set
> them to. The "off" setting turns them off, and the "on" option turns
> them on (if the device supports it).
> 
> Turning ECRC on or off can be a data integrity versus performance
> tradeoff.  In theory, turning it on will catch more data errors,
> turning it off means possibly better performance since CRC does not
> need to be calculated by the PCIe hardware and packet sizes are
> reduced.
> 
> Signed-off-by: Andrew Patterson <andrew.patterson@...com>

Applied to my for-linus branch, thanks Andrew.

-- 
Jesse Barnes, Intel Open Source Technology Center
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