netdev - Quota in __qdisc_run() (was: qdisc: validate skb without holding lock)

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Date:	Tue, 7 Oct 2014 09:34:41 +0200
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	therbert@...gle.com, hannes@...essinduktion.org, fw@...len.de,
	dborkman@...hat.com, jhs@...atatu.com, alexander.duyck@...il.com,
	john.r.fastabend@...el.com, dave.taht@...il.com, toke@...e.dk,
	brouer@...hat.com
Subject: Quota in __qdisc_run() (was: qdisc: validate skb without holding
 lock)


On Fri, 03 Oct 2014 16:30:44 -0700 Eric Dumazet <eric.dumazet@...il.com> wrote:

> Another problem we need to address is the quota in __qdisc_run()
> is no longer meaningfull, if each qdisc_restart() can pump many packets.

I fully agree. My earlier "magic" packet limit was covering/pampering
over this issue.

> An idea would be to use the bstats (or cpu_qstats if applicable)

Please elaborate some more, as I don't completely follow (feel free to
show with a patch ;-)).

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Sr. Network Kernel Developer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer
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