netdev - Re: [PATCH net-next V2 03/16] net: fec: pass txq to fec_enet_tx_queue instead of queue

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Date:	Tue, 1 Mar 2016 16:26:15 -0600
From:	Zhi Li <lznuaa@...il.com>
To:	Troy Kisky <troy.kisky@...ndarydevices.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Duan Fugang-B38611 <B38611@...escale.com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Andrew Lunn <andrew@...n.ch>,
	Philippe Reynes <tremyfr@...il.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Laci Tele <laci@...ndarydevices.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Johannes Berg <johannes@...solutions.net>,
	Joshua Clayton <stillcompiling@...il.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH net-next V2 03/16] net: fec: pass txq to fec_enet_tx_queue
 instead of queue_id

On Tue, Mar 1, 2016 at 3:51 PM, Troy Kisky
<troy.kisky@...ndarydevices.com> wrote:
> True, but fec_txq/fec_rxq is called in a loop.

netdev_priv(ndev) is that pointer move.
dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN)

Modem compiler can handle it greatly.

You can't get any valuable performance gain by that.

The main time of CPU is call dma_map_xxx.

best regards
Frank Li