netdev - Re: [PATCH 2/4] e1000: add module option to set transmit descriptor size

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Date:	Fri, 27 Jun 2008 01:10:37 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Andy Gospodarek <andy@...yhouse.net>
CC:	netdev@...r.kernel.org, jeffrey.t.kirsher@...el.com,
	jesse.brandeburg@...el.com
Subject: Re: [PATCH 2/4] e1000: add module option to set transmit descriptor
 size

Andy Gospodarek wrote:
> This patch added the TxDescPower parameter to the e1000 module.  This
> parameter represents the size-order of each transmit descriptor.  The
> valid size for descriptors would be 2^7 (128) - 2^12 (4096) bytes each.
> As this value decreases one may want to consider increasing the
> TxDescriptors value to maintain the same amount of frame memory.  This
> patch does not change the defaults for any particular hardware model, so
> this will not have an effect on existing users.
> 
> The purpose of the patch is to address Tx Timeouts on 82545 and 82546
> chips that can show up during high-stress situations.  Decreasing the
> transmit descriptor size can shorten the amount of time that will be
> spent DMAing frames to the hardware and can reduce the likely-hood that
> Tx Timeouts will occur.
> 
> Signed-off-by: Andy Gospodarek <andy@...yhouse.net>
> ---
>  drivers/net/e1000/e1000.h       |    6 ++++++
>  drivers/net/e1000/e1000_main.c  |   12 ++----------
>  drivers/net/e1000/e1000_param.c |   33 +++++++++++++++++++++++++++++++++++
>  3 files changed, 41 insertions(+), 10 deletions(-)

I don't see why a module parameter is needed.  In practice, nobody will 
ever think about this option, much less use it.


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