netdev - Re: [PATCH net 1/2] Revert "sfc: Use write-combining to reduce TX latency" and follow-ups

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Date:	Thu, 15 Sep 2011 17:25:38 -0400 (EDT)
From:	David Miller <davem@...hat.com>
To:	bhutchings@...arflare.com
Cc:	netdev@...r.kernel.org, linux-net-drivers@...arflare.com
Subject: Re: [PATCH net 1/2] Revert "sfc: Use write-combining to reduce TX
 latency" and follow-ups

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Thu, 01 Sep 2011 23:09:29 +0100

> This reverts commits 65f0b417dee94f779ce9b77102b7d73c93723b39,
> d88d6b05fee3cc78e5b0273eb58c31201dcc6b76,
> fcfa060468a4edcf776f0c1211d826d5de1668c1,
> 747df2258b1b9a2e25929ef496262c339c380009 and
> 867955f5682f7157fdafe8670804b9f8ea077bc7.
> 
> Depending on the processor model, write-combining may result in
> reordering that the NIC will not tolerate.  This typically results
> in a DMA error event and reset by the driver, logged as:
> 
> sfc 0000:0e:00.0: eth2: TX DMA Q reports TX_EV_PKT_ERR.
> sfc 0000:0e:00.0: eth2: resetting (ALL)
> 
> Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
> ---
> Please queue this for 3.0.y as well.

Applied and queued.
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