From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: "Toke Høiland-Jørgensen" <toke@toke.dk>
Cc: Paolo Valente <paolo.valente@unimore.it>,
codel@lists.bufferbloat.net, cerowrt-devel@lists.bufferbloat.net,
bloat <bloat@lists.bufferbloat.net>,
David Woodhouse <dwmw2@infradead.org>,
John Crispin <blogic@openwrt.org>
Subject: Re: [Bloat] FQ_Codel lwn draft article review
Date: Mon, 26 Nov 2012 09:20:48 -0800 [thread overview]
Message-ID: <20121126172048.GF2474@linux.vnet.ibm.com> (raw)
In-Reply-To: <87a9u7amon.fsf@toke.dk>
On Sat, Nov 24, 2012 at 01:07:04AM +0100, Toke Høiland-Jørgensen wrote:
> "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> writes:
>
> > I am using these two in a new "Effectiveness of FQ-CoDel" section.
> > Chrome can display .svg, and if it becomes a problem, I am sure that
> > they can be converted. Please let me know if some other data would
> > make the point better.
>
> If you are just trying to show the "ideal" effectiveness of fq_codel,
> two attached graphs are from some old tests we did at the UDS showing a
> simple ethernet link between two laptops with a single stream going in
> each direction. This is of course by no means a real-world test, but on
> the other hand they show a very visible factor ~4 improvement in
> latency.
>
> These are the same graphs Dave used in his slides, but also in a 100mbit
> version.
>
> > Also, I know what ICMP is, but the UDP variants are new to me. Could
> > you please expand the "EF", "BK", "BE", and "CSS" acronyms?
>
> The UDP ping times are simply roundtrips/second (as measured by netperf)
> converted to ping times. The acronyms are diffserv markings, i.e.
> EF=expedited forwarding, BK=bulk (CS1 marking), BE=best effort (no
> marking). The UDP ping tests tend to not work so well on a loaded link,
> however, since netperf stops sending packets after detecting
> (excessive(?)) loss. Which is why you see only see the UDP ping times on
> the first part of the graph.
>
> The markings are also used on the TCP flows, as seen in the legend for
> the up/downloads.
>
> > All sessions were started at T+5, then?
>
> The pings start right away, the transfers start at T+5 seconds. Looks
> like the first ~five seconds of transfer is being cut off on those
> graphs. I think what happens is that one of the streams (the turquoise
> one) starts up faster than the other ones, consuming all the bandwidth
> for the first couple of seconds until they adjust to the same level.
> These initial values are then scaled off the graph as outlier values. If
> you zoom in on the beginning of the graph you can see the turquoise line
> coming down from far off the scale in one direction, while the rest come
> From off the bottom.
>
> > Please see attached for update including .git directory.
>
> I got a little lost in all the lists of SFQ, but other than that I found
> it quite readable. The diagrams of the queuing algorithms are a tad big,
> though, I think. :)
Thank you, I have shrunk the figures and added the acronym expansions.
Thanx, Paul
> When is the article going to be published?
>
> -Toke
>
> --
> Toke Høiland-Jørgensen
> toke@toke.dk
>
next prev parent reply other threads:[~2012-11-26 17:21 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAA93jw5yFvrOyXu2s2DY3oK_0v3OaNfnL+1zTteJodfxtAAzcQ@mail.gmail.com>
2012-11-23 8:57 ` Dave Taht
2012-11-23 22:18 ` Paul E. McKenney
2012-11-24 0:07 ` Toke Høiland-Jørgensen
2012-11-24 16:19 ` Dave Taht
2012-11-24 16:36 ` [Bloat] [Cerowrt-devel] " dpreed
2012-11-24 19:57 ` [Bloat] [Codel] " Andrew McGregor
2012-11-26 21:13 ` Rick Jones
2012-11-26 21:19 ` Dave Taht
2012-11-26 22:16 ` [Bloat] " Toke Høiland-Jørgensen
2012-11-26 23:21 ` Toke Høiland-Jørgensen
2012-11-26 23:39 ` [Bloat] [Cerowrt-devel] " dpreed
2012-11-26 23:58 ` Toke Høiland-Jørgensen
2012-11-27 16:41 ` Oliver Hohlfeld
2012-11-28 0:51 ` Toke Høiland-Jørgensen
2012-11-28 19:21 ` Greg White
2012-11-28 19:45 ` Simon Barber
2012-11-28 20:01 ` Oliver Hohlfeld
2012-11-28 21:40 ` Greg White
2012-11-28 20:09 ` Oliver Hohlfeld
2012-11-28 21:45 ` Greg White
2012-11-26 17:20 ` Paul E. McKenney [this message]
2012-11-26 21:05 ` [Bloat] [Codel] " Rick Jones
2012-11-26 23:18 ` Rick Jones
2012-11-27 22:03 ` [Bloat] [Cerowrt-devel] " Jim Gettys
2012-11-27 22:31 ` David Lang
2012-11-27 22:54 ` Paul E. McKenney
2012-11-27 23:15 ` [Bloat] [Codel] " Andrew McGregor
2012-11-28 0:51 ` Paul E. McKenney
2012-11-28 17:36 ` Paul E. McKenney
2012-11-28 14:06 ` [Bloat] " Michael Richardson
2012-11-27 22:49 ` Paul E. McKenney
2012-11-27 23:53 ` [Bloat] [Codel] " Greg White
2012-11-28 0:27 ` Paul E. McKenney
2012-11-28 3:43 ` Kathleen Nichols
2012-11-28 4:38 ` Paul E. McKenney
2012-11-28 16:01 ` Paul E. McKenney
2012-11-28 16:16 ` Jonathan Morton
2012-11-28 17:44 ` Paul E. McKenney
2012-11-28 18:37 ` Michael Richardson
2012-11-28 18:51 ` Eric Dumazet
2012-11-28 21:44 ` Michael Richardson
2012-11-28 19:00 ` Eric Dumazet
[not found] ` <87vcckb0el.fsf@toke.dk>
2012-12-02 21:47 ` Andrew McGregor
2012-12-03 8:04 ` Dave Taht
2012-12-02 22:07 ` Eric Dumazet
[not found] ` <87lidgaynn.fsf@toke.dk>
2012-12-02 22:30 ` Eric Dumazet
2012-11-28 17:20 ` [Bloat] " Paul E. McKenney
[not found] ` <20121202230635.GA16359@linux.vnet.ibm.com>
[not found] ` <87obib5qf8.fsf@toke.dk>
2012-12-03 11:31 ` Dave Taht
[not found] ` <87fw3n5m9g.fsf@toke.dk>
2012-12-03 14:58 ` Paul E. McKenney
2012-12-03 15:49 ` [Bloat] [Codel] " Eric Dumazet
2012-12-03 15:03 ` [Bloat] " Paul E. McKenney
2012-12-03 15:58 ` David Woodhouse
2012-12-04 3:13 ` [Bloat] [Codel] " Dan Siemon
2012-12-04 9:23 ` Alex Burr
2012-12-05 3:41 ` Dan Siemon
2012-12-05 20:33 ` Alex Burr
2012-12-06 4:12 ` Dan Siemon
2012-12-06 23:41 ` Alex Burr
2012-12-05 0:01 ` Sebastian Moeller
2012-11-30 1:09 ` [Bloat] " Dan Siemon
2013-01-01 20:50 ` Dan Siemon
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