[Bloat] fixing bufferbloat in 2017

Dave Taht dave.taht at gmail.com
Wed Nov 23 15:20:15 EST 2016

On Wed, Nov 23, 2016 at 11:42 AM, David Lang <david at lang.hm> wrote:
> Most people not only aren't operating at 1Gb/sec, they can't buy a 1Gb/sec
> line at any cost.

I too have seen the bursty behavior that OP is describing. It's one
reason why cake's estimator can't get a good result on cable.

> 100Mb is getting more common, but the majority of people cannot buy a line
> this fast for any amount of money.
> 10-30 Mb is probably the range that "most people" have, with a large number
> stll having <10Mb available, no matter what they are willing to pay
> David Lang
> On Wed, 23 Nov 2016, Benjamin Cronce wrote:
>> I meant the actual physical link, not the provisioned rate. Most last mile
>> tech encapsulates Ethernet frames into larger super-frames. Decapsulating
>> the Ethernet frames is pretty much at 1Gb line rate. On my GPON link, with
>> shaping in PFSense turned off, I regularly see 4,000+ 1500byte datagrams
>> at
>> full 1Gb link rate hitting my WAN before my ISP starts shaping to my
>> 150Mb/s average. When I had a cable modem, I would see similar, except
>> instead of a constant 1Gb/s, I would see bursts of multiple packets, then
>> a
>> small pause, but eventually the packets started to get more and more
>> spaced
>> as the provisioned average started to kick in. I assumed this was because
>> my DOCSIS3 8x bonded link could only max out around 300Mb/s, even though
>> my
>> provisioned rate was only 30Mb/s.
>> It really depended on the quantum of the shaping algorithm, calculated
>> average window size, and how elastic or strict it was.
>> Ahh, packet packing, what a fun problem.
>> On Wed, Nov 23, 2016 at 12:38 PM, David Lang <david at lang.hm> wrote:
>>> On Wed, 23 Nov 2016, Benjamin Cronce wrote:
>>> Most people only have a 1Gb network link,
>>> umm, no, most people have FAR slower links, by an order or two of
>>> magnatude.
>>> David Lang
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Dave Täht
Let's go make home routers and wifi faster! With better software!

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