[Codel] fq_codel : interval servo

Dave Taht dave.taht at gmail.com
Sun Sep 2 20:18:19 EDT 2012

On Sun, Sep 2, 2012 at 4:23 PM, Eric Dumazet <eric.dumazet at gmail.com> wrote:
> On Sun, 2012-09-02 at 11:08 -0700, Dave Taht wrote:
>> On Sat, Sep 1, 2012 at 5:53 AM, Eric Dumazet <eric.dumazet at gmail.com> wrote:
>> > On Fri, 2012-08-31 at 09:59 -0700, Dave Taht wrote:
>> >
>> >> I realize that 10GigE and datacenter host based work is sexy and fun,
>> >> but getting stuff that runs well in today's 1-20Mbit environments is
>> >> my own priority, going up to 100Mbit, with something that can be
>> >> embedded in a SoC. The latest generation of SoCs all do QoS in
>> >> hardware... badly.
>> >
>> > Maybe 'datacenter' word was badly chosen and you obviously jumped on it,
>> > because it meant different things for you.
>> I am hypersensitive about optimizing for sub-ms problems when there are
>> huge multi-second problems like in cable, wifi, and cellular. Recent paper:
>> http://conferences.sigcomm.org/sigcomm/2012/paper/cellnet/p1.pdf
> Yes. Take a deep breath, please.
> In France, we use to say : "Rome ne s'est pas faite en un jour"
> It means you wont solve all your problems at once.


> Step by step we improve things, and we discover new issues or
> possibilities.
> So denying one particular improvement is not good because it doesnt
> solve the 'Bufferbloat in the known Universe' is not very helpful.

I didn't say that. I LOVE that you and lots of people are fiddling
with various ideas around the core
codel concepts, and clearly said I think it's neat...

My larger question, poorly put, was:

what would applying ideas to codel based on measured tcp srrt,
do in the larger known universe as (for example) outlined by the data in that
paper, along with different tcps of any flavor at any rtt?

your original thought was to limit it to the local lan somehow.

Dave Täht
http://www.bufferbloat.net/projects/cerowrt/wiki - "3.3.8-17 is out
with fq_codel!"

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