netdev - Re: [PATCH 1/4] net: skb_orphan on dev_hard_start

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Date:	Sun, 5 Jul 2009 11:34:08 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	rusty@...tcorp.com.au, patrick.ohly@...el.com,
	netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	divy@...lsio.com, rolandd@...co.com, xemul@...nvz.org,
	dcbw@...hat.com, libertas-dev@...ts.infradead.org
Subject: Re: [PATCH 1/4] net: skb_orphan on dev_hard_start_xmit

On Sun, Jul 05, 2009 at 11:26:58AM +0800, Herbert Xu wrote:
> 
> 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,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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