[Bloat] Does employing a AQM on the home router also solve bufferbloat between home router and upstream devices?

[David Lang]

a normal smart queue will solve the problem on any links it's sending to, so it 
will solve the problem on the upstream connection to your ISP.

to address the downstream side, you either need a smart queue on the ISP side, 
or you need to play 'interesting' games with acks to throttle the senders so 
that they don't overwelm the downstream.

cake and some other options do these downtream tricks, but it would be better to 
have a smart queue on the ISP side.

smart queueing only matters on whatever link is the bottleneck, on the other 
links, the queue sizes are zero.

David Lang

  On Tue, 2 Jun 2020, Tianhe wrote:

> Date: Tue, 2 Jun 2020 10:49:15 +0800
> From: Tianhe <ptq008 at gmail.com>
> To: bloat at lists.bufferbloat.net
> Subject: [Bloat] Does employing a AQM on the home router also solve
>     bufferbloat between home router and upstream devices?
> 
> Hi there. I've read some materials from bufferbloat.net and other sites,
> trying to understand the problem as best as I can.
>
> And I have a question when reading this:
>
> From
> https://www.bufferbloat.net/projects/bloat/wiki/What_can_I_do_about_Bufferbloat/
> , it says:
>
> Once you fix it for your own network, it’ll stay fixed for all time, and
>> you won’t be subject to changing practices at your ISP or other vendors.
>>
>
> What does it mean?
>
> Does it mean that :
>
> if I employ a Smart Queue Management algorithms on my home router, it only
> solves the bufferbloat problem between my home devices (desktop, laptop
> ,cellphone) to my home router. But the buffers between my home router to
> upstream devices (my home router  ---> modem ---> ISP routers/switches) ,
> buffers between upstream devices, will still harm? So I only fix the
> bufferbloat problem on my own local network?
>
> or it mean that employing a Smart Queue Management algorithms on the home
> router also solve bufferbloat between home router and upstream devices?
>
> Thanks in advance.
>
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