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

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Message-ID: <4B0627FA.3060103@gmail.com>
Date:	Fri, 20 Nov 2009 06:24:10 +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 :
> You call xps_flush() in net_rx_aciton(). It means that if no new
> packet arrives, xps_flush() won't be called forever, and the memory
> used by skbs will be hold forever. Did I misunderstand? Your algorithm
> only works with packet forwarding but sending packets from local
> sockets.
> 

Please re-read my patch, you misunderstood it, or I dont get you.

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.
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