[Starlink] [Rpm] Fwd: [Make-wifi-fast] make-wifi-fast

Mon Jan 2 13:57:33 EST 2023

Since the speed of light is relatively fixed, I wonder if we could come
up with a memorable equation for how much buggering one needs for a
given RTT?

Preferably as memorable as E=MC^2

B <= C / RTT ? (:-))

--dave

On 1/2/23 13:44, Ben Greear via Starlink wrote:
> On 1/2/23 9:35 AM, David Fernández via Starlink wrote:
>> Just wondering how comes that buffering is not standardized. Wondering
>> why buffer sizes are left to implementation decisions of possibly
>> clueless vendors, which devices can worsen the performance of the
>> network.
>
> There is no perfect answer, and every configuration has some trade-off.
>
> It is a long grind of tricky code and careful and widely varied testing
> to make progress in this area.
>
> Thanks,
> Ben
>
>>
>>> Date: Fri, 23 Dec 2022 19:00:56 -0500 (EST)
>>> From: "David P. Reed" <dpreed at deepplum.com>
>>> To: starlink-request at lists.bufferbloat.net
>>> Cc: starlink at lists.bufferbloat.net
>>> Subject: Re: [Starlink] [Rpm] Fwd: [Make-wifi-fast] make-wifi-fast
>>> Message-ID: <1671840056.20758968 at mobile.rackspace.com>
>>> Content-Type: text/plain;charset=UTF-8
>>>
>>> Sorry for front posting. The L2 and L3
>>> are following the "end to end argument". The function of the L2
>>> network is
>>> to not queue more than absolutely necessary.
>>> The function at L3 is to respond to congestion signals by reducing
>>> input to
>>> a fair share of available capacity, quickly, cooperating with other L3
>>> protocols.
>>>
>>> This is understood by clueful L2 and L3 folks.
>>>
>>> Clueless vendors dominate the L2 vendor space. Sadly. They refuse to
>>> stop
>>> over buffering.
>>>
>>>
>>> Date: Fri, 23 Dec 2022 16:02:03 +0100
>>> : David Fernández
>>> To: starlink at lists.bufferbloat.net
>>> Subject: Re: [Starlink] [Rpm] Fwd: [Make-wifi-fast] make-wifi-fast
>>>
>>> Hi,
>>>
>>> Sorry, maybe I did not craft the subject correctly. I am receiving the
>>> daily digest of the list, not individual messages.
>>>
>>> I have seen before that the L2 engineers (Wi-Fi, DVB...) and the
>>> Internet engineers (L3) are trying to solve the same issue (QoS,
>>> congestion control) without being aware of what each other are doing
>>> and not even getting coordinated. I am afraid that nowadays we have
>>> even the application layer engineers doing their own stuff (DASH,
>>> CDNs...).
>>>
>>> Some time ago, I worked in a project about cross-layer optimization
>>> techniques for SATCOM systems, where one of the issues was to try to
>>> optimize transport layer performance with L2 info. I was just a mere
>>> observer of what academy people in the consortium where proposing.
>>>
>>> That was quite long ago:
>>> https://artes.esa.int/projects/ipfriendly-crosslayer-optimization-adaptive-satellite-systems
>>>
>>>
>>> Today I came across this:
>>> https://www.elektormagazine.com/news/white-paper-why-wi-fi-6-goes-hand-in-hand-with-cellular-to-enable-the-hyper-connected-enterprise-future
>>>
>>>
>>> "the performance uplift of Wi-Fi 6 over Wi-Fi 5 is substantial and
>>> more than sufficient to support innovative use cases such as automated
>>> guided vehicles, industrial robots and many other applications."
>>>
>>> This sound like Wi-Fi 6 will support low latency and will have a good
>>> QoS support. Maybe...
>>>
>>> Regards,
>>>
>>> David
>>>
>>> 2022-12-21 8:54 GMT+01:00, Sebastian Moeller :
>>>> Hi,
>>>>
>>>> See [SM] below.
>>>>
>>>> On 21 December 2022 08:37:27 CET, "David Fernández via Starlink"
>>>>   wrote:
>>>>> What about this?
>>>>> https://www.wi-fi.org/discover-wi-fi/wi-fi-certified-wmm-programs
>>>>>
>>>>> Isn't this Wi-Fi MM (Multimedia) supposed to solve Wi-Fi QoS issues?
>>>>
>>>>          [SM] In home network reality it failed to do so. I would
>>>> guess
>>>> partly because the admission control component is optional and as
>>>> far as I
>>>> can tell not available in the usual WiFi routers and APs. A free
>>>> for all
>>>> priority system that in addition diminishes the total achievable
>>>> throughput
>>>> when the higher priority tiers are used introduces at least as much
>>>> QoS
>>>> issues a it solves IMHO. This might be different for 'enterprise WiFi
>>>> gear'
>>>> but I have no experience with that...
>>>>
>>>> Regard
>>>>        Sebastian
>>>>
>>>> P.S.: This feels like you might responded to a different thread
>>>> than the
>>>> iperf2 one we are in right now?
>>>>
>>>>
>>>>
>>>>>
>>>>>> Date: Thu, 08 Dec 2022 11:04:13 -0800
>>>>>> From: rjmcmahon
>>>>>> To: Sebastian Moeller
>>>>>> Cc: rjmcmahon via Make-wifi-fast
>>>>>>     , Dave Täht
>>>>>>     , Rpm , libreqos
>>>>>>
>>> , Dave Taht via Starlink
>>>>>>     , bloat
>>>>>> Subject: Re: [Starlink] [Rpm] Fwd: [Make-wifi-fast] make-wifi-fast
>>>>>>     2016 &    crusader
>>>>>> Message-ID:
>>>>>> Content-Type: text/plain; charset=UTF-8; format=flowed
>>>>>>
>>>>>> Thanks for the well-written response Sebastian. I need to think more
>>>>>> about the load vs no load OWD differentials and maybe offer that
>>>>>> as an
>>>>>> integrated test. Thanks for bringing it up (again.) I do think a
>>>>>> low-duty cycle bounceback test to the AP could be interesting too.
>>>>>>
>>>>>> I don't know of any projects working on iperf 2 & containers but
>>>>>> it has
>>>>>> been suggested as useful.
>>>>>>
>>>>>> Bob
>>>>>>
>>>>> _______________________________________________
>>>>> Starlink mailing list
>>>>> Starlink at lists.bufferbloat.net
>>>>> https://lists.bufferbloat.net/listinfo/starlink
>>>>
>>>> --
>>>> Sent from my Android device with K-9 Mail. Please excuse my brevity.
>>>>
>>>
>> _______________________________________________
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>> Starlink at lists.bufferbloat.net
>> https://lists.bufferbloat.net/listinfo/starlink
>>
>
>
--
David Collier-Brown,         | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
dave.collier-brown at indexexchange.com |              -- Mark Twain

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