netdev - Re: [net-next PATCH V5] qdisc: bulk dequeue support for qdiscs with TCQ_F

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Date:	Thu, 2 Oct 2014 09:44:18 +0200
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	Dave Taht <dave.taht@...il.com>
Cc:	Jamal Hadi Salim <jhs@...atatu.com>,
	Tom Herbert <therbert@...gle.com>,
	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Florian Westphal <fw@...len.de>,
	Daniel Borkmann <dborkman@...hat.com>,
	Alexander Duyck <alexander.duyck@...il.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Toke Høiland-Jørgensen <toke@...e.dk>,
	brouer@...hat.com, Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [net-next PATCH V5] qdisc: bulk dequeue support for qdiscs with
 TCQ_F_ONETXQUEUE

On Wed, 1 Oct 2014 22:18:05 -0700 Dave Taht <dave.taht@...il.com> wrote:

> > I usually also monitors the BQL limits during these tests.
> >
> >  grep -H . /sys/class/net/eth4/queues/tx-*/byte_queue_limits/{inflight,limit}
> >
> > To Toke:
> >  Perhaps we could convince Toke, to add a netperf-wrapper recorder for
> > the BQL inflight and limit?  (It would be really cool to plot together)
> 
> I just added a command line mode and support for timestamped limit and
> inflight output to bqlmon
> 
> Get it here:
> 
> https://github.com/dtaht/bqlmon
>
> That should be sufficient for netperf-wrapper to poll it efficiently.

https://github.com/dtaht/bqlmon/commit/ace44b55e2e521af88ba9927bf30fe615024073d#diff-aacbd6867cca49695bfe76ad2bcd45d1R407

Now, that we are in control of the output format.  I would output
something that is easier to parse for netperf-wrapper, e.g. some json
compliant string (it is future extendable and easy to parse for Toke).
Besides the output format, I like you patch to bqlmon.

Perhaps Toke have an opinion on the output formatting from bqlmon?

-- 
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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