linux-kernel - Re: [PATCH v3] PCI: Add support for turning PCIe ECRC on or off

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Date:	Thu, 11 Jun 2009 11:43:39 -0700
From:	Jesse Barnes <jesse.barnes@...el.com>
To:	Andrew Patterson <andrew.patterson@...com>
Cc:	linux-pci@...r.kernel.org, andrew.patterson@...com,
	linux-kernel@...r.kernel.org, kaneshige.kenji@...fujitsu.com
Subject: Re: [PATCH v3] PCI: Add support for turning PCIe ECRC on or off

On Wed, 22 Apr 2009 16:52:09 -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 linux-next, thanks.

-- 
Jesse Barnes, Intel Open Source Technology Center
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