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

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Message-ID: <AANLkTimTakJHg2wTrPjhgLPK7vh2qDjKgZVKuJ1si8er@mail.gmail.com>
Date:	Mon, 7 Jun 2010 18:26:32 +0800
From:	Sonic Zhang <sonic.adi@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	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

On Mon, Jun 7, 2010 at 5:58 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le vendredi 04 juin 2010 à 12:44 +0800, Sonic Zhang a écrit :
>
>>
>> Yes, you are right. dev_kfree_skb_irq() queues used skb to the
>> complete queue. But, it is actually freed in the other soft irq
>> NET_TX_SOFTIRQ.
>
> I guess you didnt understood my mail, so I'll re-explain :
>
> dev_kfree_skb_irq() queues skb only if packet is not already orphaned.
>
> As most packets are now orphaned (in recent kernels where your patch
> applies), dev_kfree_skb_irq() can free packet immediately, with no
> NET_TX_SOFTIRQ overhead.
>
>

OK. I didn't notice the recent change in kernel to orphan most
packets. You are right, my second reason is out of date.

Thanks

Sonic

>
>
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