netdev - Re: [net-next 01/11] ixgbe: Do not use DCA to prefetch the entire packet into the cache

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Message-ID: <1352816011.6185.33.camel@edumazet-glaptop>
Date:	Tue, 13 Nov 2012 06:13:31 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	davem@...emloft.net, Alexander Duyck <alexander.h.duyck@...el.com>,
	netdev@...r.kernel.org, gospo@...hat.com, sassmann@...hat.com
Subject: Re: [net-next 01/11] ixgbe: Do not use DCA to prefetch the entire
 packet into the cache

On Tue, 2012-11-13 at 06:03 -0800, Jeff Kirsher wrote:
> From: Alexander Duyck <alexander.h.duyck@...el.com>
> 
> The way the code was previously written it was causing DCA to prefetch the
> entire packet into the cache when it was enabled.  That is excessive as we
> only really need the headers.
> 
> We are now prefetching the headers via software so doing this from DCA would
> be redundant anyway.  So clear the bit that was causing us to prefetch the
> packet data and instead only use DCA for the descriptor rings.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
> Tested-by: Phil Schmitt <phillip.j.schmitt@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> ---

Excellent !

My own ixgbe cards are moving so I cant test this, do you guys have some
numbers to share ?

Thanks


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