Re: [Bloat] extremely good dslreports result for bufferbloat on free.fr

[jb <justin@dslr.net>]

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Each bar is an individual probe they go out once per second, which
determines their
position along the X-Axis, and are tagged by color *when they come back*.

For the radar plot, the ones showing latencies to each location, it is
nothing to do
with buffer bloat but there are two green colors super-imposed, the worst
and the
best of several probes per location.

On Sat, May 2, 2015 at 9:49 PM, Sebastian Moeller <moeller0@gmx.de> wrote:

> Hi Jb,
>
> I wonder the ping RTT plot, does it show all individual RTT-probes, or is
> it showing an aggregate measure per bar? If aggregate which measure
> (hopefully the maximum or something close like a high percentile)?
>
>
> Best Regards
>         Sebastian
>
> On May 1, 2015, at 08:31 , jb <justin@dslr.net> wrote:
>
> > >This got an A+ rating, which I would not have given it, given the
> > enormous load spike.
> >
> > I think there will always be the occasional incorrectly graded test,
> > this one is simply because the median of the downstream latency
> > ignores the spike. If I used average(), then it would not ignore
> > the spike, however one very high outlier could also ruin a good result.
> > After all, pinging anything on the internet can always get the odd
> > bad response now and again.
> >
> > If neither average nor median is any good, then there needs to be
> > a filter function. But what filter? ignoring spikes that are hugely
> higher
> > than neighbouring ones? that would fail if there was a spike every 3rd
> > sample. Open to ideas..
> >
> > Here is a result from the australian telco free public hotspot:
> >     http://www.dslreports.com/speedtest/399962
> >
> > On the side of the hotspot it says 'send us your thoughts about this
> > free service'. Well my thought is that if one person posted a picture
> > to Instagram, the whole hotspot would be unusable for as long as it
> > took to upload. 6 seconds of buffer in there somewhere.
> >
> > cheers,
> >
> > On Fri, May 1, 2015 at 4:05 PM, Dave Taht <dave.taht@gmail.com> wrote:
> > This got an A+ rating, which I would not have given it, given the
> > enormous load spike.
> >
> > http://www.dslreports.com/speedtest/400387
> >
> > Imagine if your steering wheel behaved like this.
> >
> > On Thu, Apr 30, 2015 at 8:10 PM, jb <justin@dslr.net> wrote:
> > > Already users are like "how can i fix this!".
> >
> > The FAQ can be improved.
> >
> > > I've just replied to one who has lower speeds on the surfboard SB6141
> which
> > > is a modem designed for crazy cable speeds. He has an "F" and his
> downstream
> > > bloat is terrible, and upstream not much better.
> > >
> > > I imagine a LOT of people on slower plans have a "recommended" modem
> like
> > > this one.
> >
> > I have not found a cable modem with less than 250ms bloat at 50mbit/5.
> > The docsis 3 ones
> > are often in the 800 ms range.
> >
> > >
> > > However most of them will hear that the problems from bloat only
> happen when
> > > you reach maximum upload or download speed and will think, well, I can
> live
> > > with that, I never run my connection to capacity and I don't upload to
> > > offsite backups..
> >
> > Latency spikes are annoying no matter how they are inflicted, and happen
> > all the time on nearly any workload. Your test is testing tcp in steady
> state,
> > most web transactions are bursts of dozens to a hundred flows in slow
> > start.
> >
> > It is the business class customers that feel it most often. I have never
> > visited a business class cable customer that had reasonable amounts of
> delay
> > and jitter during business hours.
> >
> > After living in  bloat-free universe for quite some time now, annoying
> > issues with things like netflix are decreased, voip and videoconferencing
> > work all the time, same for games...
> >
> > it would be hard to create a metric
> > for user satisfaction, but every before/after comparison someone
> > implementing a solution is quite overjoyed.
> >
> > https://twitter.com/mnot/status/575581792650018816
> >
> > >
> > > On Fri, May 1, 2015 at 10:48 AM, Rich Brown <richb.hanover@gmail.com>
> wrote:
> > >>
> > >>
> > >> > On Wed, Apr 29, 2015 at 9:33 PM, jb <justin@dslr.net> wrote:
> > >> > ...
> > >> >> if it did get a rating it would be an "D" or "F"..
> > >> >
> > >> > How about "E" for error? That can be further explained in the text
> > >> > "Sometimes the bloat is so bad that we cannot adaquately test for
> it -
> > >> > and other times there is something else badly wrong with the link
> that
> > >> > we cannot identify."
> > >>
> > >> I would stay away from a letter grade for that state, since it could
> > >> appear to be on the continuum of A+, A, B, C, D, E (?) F...
> > >>
> > >> Better to give it a "-" or "?" mark. And if they hover over the "?",
> let
> > >> the text show: "Sometimes the bloat is so bad that we cannot
> adaquately test
> > >> for it - and other times there is something else badly wrong with the
> link
> > >> that we cannot identify."
> > >>
> > >> Rich
> > >
> > >
> >
> >
> >
> > --
> > Dave Täht
> > Open Networking needs **Open Source Hardware**
> >
> > https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67
> >
> > _______________________________________________
> > Bloat mailing list
> > Bloat@lists.bufferbloat.net
> > https://lists.bufferbloat.net/listinfo/bloat
>
>

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