netdev - Re: [PATCH v2] netdev:bfin_mac: reclaim and free tx skb as soon as possible after transfer

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Date:	Thu, 3 Jun 2010 16:57:24 +0800
From:	Junchang Wang <junchangwang@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	sonic zhang <sonic.adi@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	uclinux-dist-devel <uclinux-dist-devel@...ckfin.uclinux.org>
Subject: Re: [PATCH v2] netdev:bfin_mac: reclaim and free tx skb as soon as 
	possible after transfer

Hi Eric,

On Thu, Jun 3, 2010 at 12:05 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Not related to your patch, but reviewing it I see this driver still do
> the "dev->stats.tx_packets++; dev->stats.tx_bytes += (skb->len);"
>
> This is not necessary and expensive, since we update txq stats in core
> network stack.
>
>        rc = ops->ndo_start_xmit(skb, dev);
>        if (rc == NETDEV_TX_OK)
>                txq_trans_update(txq);  << here >>
>

Good suggestion for drivers. But I wonder whether there are stats for
received packets in core network stack.

I.e., can I replace "dev->stats.rx_packets++" and "dev->stats.rx_bytes
+= (skb->len);" with something already maintained by core stack? I
failed to find them.

Thanks.


-- 
--Junchang
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