[LEDE-DEV] RFC: Throughput testing results.

[Dave Taht]

On Fri, May 6, 2016 at 4:00 PM, Ben Greear <greearb at candelatech.com> wrote:
> On 05/06/2016 12:05 PM, David Lang wrote:
>>
>> On Fri, 6 May 2016, Ben Greear wrote:
>>
>>> On 05/06/2016 10:20 AM, Toke Høiland-Jørgensen wrote:
>>>>
>>>> Ben Greear <greearb at candelatech.com> writes:
>>>>
>>>>> I am interested in feedback on the testing output. My goal is to add a
>>>>> few more different hardware configurations and then do nightly (or at
>>>>> least weekly) tests.
>>>>
>>>>
>>>> So that is showing up to 10s of *seconds* of latency, right? (I'm not
>>>> sure I'm reading the units right).
>>>
>>>
>>> Yes, 10 seconds of latency.  My traffic generator is using pfifo-fast,
>>> RENO, and default socket sizes, so it can be at least part of the
>>> problem.
>>
>>
>> That's so much latency that you may as well be down.
>>
>> Please look at the make-wifi-fast mailing list and the tests that are
>> being done there. they show latency spikes as well as throughput, and show
>> how it is very
>> possible to get low latency without affecting throughput (in some cases,
>> throughput actually increases)
>
>
> I did some tcp/udp mix, tcp only, udp only download tests, with fq_codel and
> fifo-fast on the traffic
> generator.  AP was un-changed, seems LEDE uses fq_codel by default.
> Generator is using 4.4.8+ kernel, and it looks
> like fq_codel works nicely!
>
> http://www.candelatech.com/examples/ventana/
>
> We'll run some tests on some of our higher-performing APs and see if
> fq_codel works well there
> too when we get a chance....

At the qdisc layer fq_codel is presently at, it is still difficult to
remove baseline latency at lower speeds nor serve multiple stations
well.

we can do much better with the patches that michal is working on

http://blog.cerowrt.org/flent/qca-10.2-fqmac35-codel-5-wifi/slow_fast_simultaneously.svg

The blog series analyzing the impact of these patches is at:
http://blog.cerowrt.org/tags/wifi/

starting, basically, here:

http://blog.cerowrt.org/post/fq_codel_on_ath10k/

It would be good to also get an ath9k and mt72 version working

> Thanks,
> Ben
>
> --
> Ben Greear <greearb at candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>



-- 
Dave Täht
Let's go make home routers and wifi faster! With better software!
http://blog.cerowrt.org