netdev - Multiqueue TX

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Message-ID: <CAJzFV37uOC15X+3PR0UJDsBGvMzRP9JRDp16CH8-OiiTv2NM7g@mail.gmail.com>
Date:	Sat, 26 Jul 2014 01:31:47 -0600
From:	Sharat Masetty <sharat04@...il.com>
To:	Linux Netdev List <netdev@...r.kernel.org>
Cc:	David Miller <davem@...emloft.net>
Subject: Multiqueue TX

I have a question from this David's nice presentation
http://vger.kernel.org/~davem/davem_nyc09.pdf on multiqueue TX. My
questions are on the slide named "PICTURE WITH NON-TRIVIAL QDISC"

1)  What is the rationale behind such an arrangement, where one would
have multiple TX queues pointing to the on single Qdisc?
2)  If the Qdisc in this illustration was a non trivial Qdisc such as
htb, which has multiple leaf Qdisc's, how would the traffic shaping be
preserved?
3) How would the back pressure/flow control of these individual TX
queues work in this case?

Thanks
Sharat
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