netdev - Re: Qdisc: Measuring Head-of-Line blocking with netperf-wrapper

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Message-ID: <1410885016.7106.203.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 16 Sep 2014 09:30:16 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Tom Herbert <therbert@...gle.com>,
	David Miller <davem@...emloft.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Florian Westphal <fw@...len.de>,
	Toke Høiland-Jørgensen <toke@...e.dk>,
	Dave Taht <dave.taht@...il.com>
Subject: Re: Qdisc: Measuring Head-of-Line blocking with netperf-wrapper

On Tue, 2014-09-16 at 17:56 +0200, Jesper Dangaard Brouer wrote:
> On Tue, 16 Sep 2014 06:59:19 -0700
> Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> > With the TCP usec rtt work I did lately, you'll get more precise results
> > from a TCP_RR flow, as Tom and I explained.
> 
> Here you go, developed a new test:

Just to make sure I understand (sorry I dont have time going all your
graphs right now)

The target of your high prio flow is different from target of the
antagonist flows ?

Otherwise, you are not only measuring head of line blocking of your
host, but the whole chain, including scheduling latencies of the
(shared) target.



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