netdev - Re: [net-next-2.6 PATCH 1/3] e1000e: use hardware writeback batching

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Message-Id: <20100930.211657.63042041.davem@davemloft.net>
Date:	Thu, 30 Sep 2010 21:16:57 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com, bphilips@...ell.com,
	jesse.brandeburg@...el.com
Subject: Re: [net-next-2.6 PATCH 1/3] e1000e: use hardware writeback
 batching

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Thu, 30 Sep 2010 00:38:49 -0700

> From: Jesse Brandeburg <jesse.brandeburg@...el.com>
> 
> Most e1000e parts support batching writebacks.  The problem with this is
> that when some of the TADV or TIDV timers are not set, Tx can sit forever.
> 
> This is solved in this patch with write flushes using the Flush Partial
> Descriptors (FPD) bit in TIDV and RDTR.
> 
> This improves bus utilization and removes partial writes on e1000e,
> particularly from 82571 parts in S5500 chipset based machines.
> 
> Only ES2LAN and 82571/2 parts are included in this optimization, to reduce
> testing load.
> 
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Tested-by: Emil Tantilov <emil.s.tantilov@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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