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

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Message-ID: <4B062C51.8090100@gmail.com>
Date:	Fri, 20 Nov 2009 06:42:41 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...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)

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 :)


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