netdev - RE: [PATCH] net: fec: remove memory copy for rx path

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Message-ID: <057807be43ca4c79ad51ab07c668519d@BLUPR03MB373.namprd03.prod.outlook.com>
Date:	Sat, 27 Sep 2014 09:15:24 +0000
From:	"fugang.duan@...escale.com" <fugang.duan@...escale.com>
To:	David Miller <davem@...emloft.net>
CC:	"Frank.Li@...escale.com" <Frank.Li@...escale.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"bhutchings@...arflare.com" <bhutchings@...arflare.com>
Subject: RE: [PATCH] net: fec: remove memory copy for rx path

From: David Miller <davem@...emloft.net> Sent: Saturday, September 27, 2014 5:07 AM
>To: Duan Fugang-B38611
>Cc: Li Frank-B20596; netdev@...r.kernel.org; shawn.guo@...aro.org;
>bhutchings@...arflare.com
>Subject: Re: [PATCH] net: fec: remove memory copy for rx path
>
>From: Fugang Duan <b38611@...escale.com>
>Date: Wed, 24 Sep 2014 14:05:30 +0800
>
>> Re-allocate skb instead of memory copy skb data in rx path to improve
>> enet rx performance.
>>
>> Signed-off-by: Fugang Duan <B38611@...escale.com>
>> Signed-off-by: Frank Li <Frank.Li@...escale.com>
>
>For small packet sizes, copying is almost certainly faster and it avoids
>mismatched skb->truesize vs. skb->len which hurts TCP performance.
>
>We call this rx_copybreak, and there are many drivers you can look at to
>see how this works.
>
>Thanks.

Great suggestion. I will change it for next version.

Thanks,
Andy
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