On Sun, Jul 05, 2009 at 11:26:58AM +0800, Herbert Xu wrote:
quoted text
> 
> Here's a another crazy idea:
> 
> Let's use dummy TX descriptors to generate an interrupt, either
> with or without transmitting an actual packet on the wire depending
> on the NIC.

Here's an even crazier idea that doesn't use dummy descriptors.

xmit(skb)

	if (TX queue contains no interrupting descriptor &&
	    qdisc is empty)
		mark TX descriptor as interrupting

	if (TX queue now contains an interrupting descriptor &&
	    qdisc len < 2)
		stop queue

	if (TX ring full)
		stop queue

clean()

 	do work
	wake queue as per usual

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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