300+ms of hotel wifi bufferbloat - peaking at 1.5 sec!

Mon Jun 1 18:52:41 UTC 2015

I did the dslreports tests on the NANOG wifi while listening to srikanth today:

http://www.dslreports.com/speedtest/593926

And my own (flent data also in this dir)...

http://snapon.lab.bufferbloat.net/~d/nanog/download_cdf.png

pretty good bandwidth. Pretty horrific latency... a couple detours
around the moon.

On Sat, May 30, 2015 at 6:59 PM, Srikanth Sundaresan
<srikanth at gatech.edu> wrote:
> While I agree that upload speeds aren't great, it doesn't mean that the
> buffers aren't big. Buffer sizes of the order of MB's are uncalled for at
> the edge, unless we're talking really high speeds. The miniscule performance
> increase for single TCP flows doesn't really justify the potential increase
> in latency for everyone else.
>
>
> On 5/30/15 6:25 PM, Steven Tardy wrote:
>>
>> There's a corollary of the bufferbloat phenomenon: buffer drain time. It's
>> not the size of the buffer, but how long it takes to empty. And US ISPs
>> continue to say "customers don't want upload speed".
>> If the ISP upload speed was symmetric you'd likely never notice the 1-2MB
>> of buffers.
>>
>> I guess what I'm getting at is why do you continue to say buffers are too
>> big instead of saying ISP upload is too slow?
>>
>>
>>> On May 30, 2015, at 1:50 PM, Dave Taht <dave.taht at gmail.com> wrote:
>>>
>>> http://www.dslreports.com/speedtest/578850
>>>
>>> I would get a kick out of it if folk here tried this new speedtest
>>> periodically (on the "cable" setting) during the nanog conference. ;)
>>> There is a hires option for more detail on the resulting charts...
>>>
>>> (or fiddled with "flent" (flent.org))
>>>
>>> --
>>> Dave Täht
>>> What will it take to vastly improve wifi for everyone?
>>> https://plus.google.com/u/0/explore/makewififast

-- 
Dave Täht
What will it take to vastly improve wifi for everyone?
https://plus.google.com/u/0/explore/makewififast