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

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Date:	Tue, 7 Oct 2014 17:26:06 +0200
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	therbert@...gle.com, 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: Re: Quota in __qdisc_run() (was: qdisc: validate skb without
 holding lock)

On Tue, 07 Oct 2014 16:43:33 +0200
Hannes Frederic Sowa <hannes@...essinduktion.org> wrote:

> On Tue, Oct 7, 2014, at 15:30, Jesper Dangaard Brouer wrote:
[...]
> > 
> > The basic idea is we want keep/restore the quota fairness between
> > qdisc's , that we sort of broke with commit 5772e9a346 ("qdisc: bulk
> > dequeue support for qdiscs with TCQ_F_ONETXQUEUE").
> > 
[...]
> 
> This needs to be:
> 
> do
>    ...
> while ((iskb = iskb->next))

Check, testing with this update, now.

My netperf-wrapper test with GSO=off TSO=off, looks much more stable at
keeping the 10G link fully utilized.  Before, without this patch, I
could not get stable results at 10G with GSO=off TSO=off.  Think this
really does address the fairness (I didn't think I would be able to
measure it).

The other cases (GSO=on,TSO=off) and (GSO=on,TSO=on) looks the same.
-- 
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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