netdev - Re: [PATCH net-next-2.6] net: Xmit Packet Steering (XPS)

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Message-ID: <412e6f7f0911192150t112dec76gdb0de5f7e004b420@mail.gmail.com>
Date:	Fri, 20 Nov 2009 13:50:42 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Tom Herbert <therbert@...gle.com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next-2.6] net: Xmit Packet Steering (XPS)

On Fri, Nov 20, 2009 at 1:42 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Changli Gao a écrit :
>> On Fri, Nov 20, 2009 at 1:24 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>>> Changli Gao a écrit :
>>>
>>> Please re-read my patch, you misunderstood it, or I dont get you.
>>
>> I think I didn't misunderstand it. If local socket only sends packets,
>> which don't need replies from receiver, so new NIC RX IRQ, and NET_RX
>> softirq won't be triggered. Who will call xps_flush() to free the
>> memory used by locally generated packets?
>>
>
> Changli, when we transmit a skb on NIC, NIC is supposed to have a TX completion
> call back, to free this skb.
>
> These completion calls are running from net_rx_action(), if driver is NAPI enabled.
>
> Only NAPI enabled drivers are allowed to use XPS infrastructure.
>
> I sent 100.000.000 packets in my pktgen+tg3 tests, without receiving a single packet
> in return, I can tell you all packets were correctly freed :)
>
>

Oh, I am so sorry. It seems I missed sth. I need to review the new
NAPI. Thanks for your patience and help.

-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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