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

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Message-ID: <412e6f7f0911192134m24beca36m1887513513f130b8@mail.gmail.com>
Date:	Fri, 20 Nov 2009 13:34:23 +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 1:24 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?

>
> If xps_consume_skb(skb) is ever called (from one to XXX times),
> then we xps_flush() them, from net_rx_action()
>
> net_rx_action()
> {
>        while (has_work) {
>                perform_napi_things(); // calls xps_consume_skb()
>        }
>        xps_flush(); // post things to remote cpus, and dont leak memory
> }
>
> This net_rx_action() is same for forwarding and localy generated packets.
>



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