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

Srikanth Sundaresan srikanth at gatech.edu
Sun May 31 01:59:53 UTC 2015

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

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