netdev - RE: [PATCH] NET: Multiqueue network device support.

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Date:	Thu, 7 Jun 2007 15:55:50 -0700
From:	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>
To:	"David Miller" <davem@...emloft.net>, <hadi@...erus.ca>
Cc:	"Kok, Auke-jan H" <auke-jan.h.kok@...el.com>, <jeff@...zik.org>,
	<kaber@...sh.net>, <netdev@...r.kernel.org>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Subject: RE: [PATCH] NET: Multiqueue network device support.

> > I empathize but take a closer look; seems mostly useless.
> 
> I thought E1000 still uses LLTX, and if so then multiple cpus 
> can most definitely get into the ->hard_start_xmit() in parallel.

Not with how the qdisc status protects it today:

include/net/pkt_sched.h:

static inline void qdisc_run(struct net_device *dev)
{
        if (!netif_queue_stopped(dev) &&
            !test_and_set_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
                __qdisc_run(dev);
}
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