netdev - Re: [PATCH v4 4/4] USBNET: ax88179_178a: enable tso if usb host supports sg dma

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Date:	Thu, 08 Aug 2013 09:01:42 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Oliver Neukum <oneukum@...e.de>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	Ben Hutchings <bhutchings@...arflare.com>,
	Grant Grundler <grundler@...gle.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Freddy Xin <freddy@...x.com.tw>
Subject: Re: [PATCH v4 4/4] USBNET: ax88179_178a: enable tso if usb host
 supports sg dma

On Thu, 2013-08-08 at 21:48 +0800, Ming Lei wrote:
> This patch enables 'can_dma_sg' flag for ax88179_178a device
> if the attached host controller supports building packet from
> discontinuous buffers(DMA SG is possible), so TSO can be enabled
> and skb fragment buffers can be passed to usb stack via urb->sg
> directly.
> 
> With the patch, system CPU utilization decreased ~50% and throughput
> increased by ~10% when doing iperf client test on one ARM A15 dual
> core board.
> 
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> Cc: Ben Hutchings <bhutchings@...arflare.com>
> Cc: Grant Grundler <grundler@...gle.com>
> Cc: Oliver Neukum <oneukum@...e.de>
> Cc: Alan Stern <stern@...land.harvard.edu>
> Cc: Freddy Xin <freddy@...x.com.tw>
> Signed-off-by: Ming Lei <ming.lei@...onical.com>
> ---
>  drivers/net/usb/ax88179_178a.c |    8 ++++++++
>  1 file changed, 8 insertions(+)

Acked-by: Eric Dumazet <edumazet@...il.com>

Thanks for doing this !


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