netdev - Re: [PATCH 11/39]: netdev: Move next_sched into struct netdev

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Message-Id: <20080714.050011.186100773.davem@davemloft.net>
Date:	Mon, 14 Jul 2008 05:00:11 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jarkao2@...il.com
Cc:	netdev@...r.kernel.org, vinay@...ux.vnet.ibm.com,
	krkumar2@...ibm.com, mchan@...adcom.com, Matheos.Worku@....COM,
	linux-wireless@...r.kernel.org
Subject: Re: [PATCH 11/39]: netdev: Move next_sched into struct
 netdev_queue.

From: Jarek Poplawski <jarkao2@...il.com>
Date: Mon, 14 Jul 2008 11:49:13 +0000

> On 03-07-2008 09:03, David Miller wrote:
> > We schedule queues, not the device, for output queue
> > processing in BH.
> > 
> ...
> > diff --git a/net/core/dev.c b/net/core/dev.c
> > index 8e38948..c5e3532 100644
> > --- a/net/core/dev.c
> > +++ b/net/core/dev.c
> > @@ -1323,13 +1323,14 @@ static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
> >  void __netif_schedule(struct net_device *dev)
> >  {
> >  	if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
> 
> Isn't this bit supposed to be set/tested per queue as well, or do I
> miss something?

That shoule not happen until my later patches which switch that all
over.

See patch 5/13 which I posted on Thursday, Jul 10.  That's when the
transition from "global queue state + per-queue state" into "only
per-queue state" happens.

Until that point, we have to keep the existing quasi-multi-queue
semantics in order to not break drivers etc.
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