netdev - qdisc running

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Date:	Sun, 19 Oct 2014 15:24:42 -0400
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
CC:	john Fastabend <john.r.fastabend@...el.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	eric Dumazet <edumazet@...gle.com>
Subject: qdisc running

Jesper,

You asked at the meeting the point to qdisc running.
Original intent is to allow only one cpu to enter the lower half of the
qdisc path. IOW, if one cpu was already in the qdisc then that guy
could be used to dequeue packets. i.e this is good for batching.
Original idea was Herbert's with major improvement from Eric
and a small one from me.

For history of different tried approaches look at:
Look at slide 2: 
http://vger.kernel.org/netconf2011_slides/jamal_netconf2011.pdf
then download the **amazing** flash animations which describe
that history.
http://vger.kernel.org/netconf2011_slides/netconf-2011-flash.tgz

Follow the bullets in slide2 and map to the flash animations.

If you go over them, you'll see it is still needed.

I think someone oughta put those **amazing** animations on some
website;->

cheers,
jamal
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