Re: [Bloat] [bbr-dev] Aggregating without bloating - hard times for tcp and wifi

[Bob McMahon <bob.mcmahon@broadcom.com>]

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Thanks for sharing this. Curious about how the xTSQ value can be set? Can
it be done with sysctl?

*We continue our analysis by using the ms-version of TSQ patch, which
enables the tune of the TSQ size allowing each TCP variant to enqueue more
than 1 ms of data at the current TCP rate. In particular, we allow to
enqueue the equivalent of x ms of data, naming each test xTSQ, with x being
an integer value. It is important to notice that this patch has been
included in the Linux kernel mainline, and each Wi-Fi driver can now set
the desired xTSQ value**.*

Another thing that could be interesting is the WiFi aggregation stop
reasons, e.g. how many times agg stopped per hitting the max mpdu per ampdu
vs the software fifo going empty (i.e. no more packets available to the
driver from the TCP stack) per that TXOP.

Finally, many (most?) APs are forwarding and feeding packets at at the
hardware level so not sure that the linux stack matters as much for an AP
based analysis, particularly when considering multi user transmissions,
i.e. multiple WiFi clients are active and sharing TXOPs.

Bob
On Mon, Nov 21, 2022 at 10:04 PM Dave Taht <dave.taht@gmail.com> wrote:

> This paper came out last month. Good work, really exhaustive look at
> two chipsets, multiple congestion controls and the interactions with
> TSQ, with
> lots and lots of flent.
>
> https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=9772053
>
> as for wifi6... don't make me start talking about wifi6... but some of
> these tests look like a good baseline to start comparing the ath11k,
> mt79, etc..
>
> Paper kind of misses the negative impact of AQL in the ath10k (and
> most likely also the mt76 and mt79 chips)
>
> --
> This song goes out to all the folk that thought Stadia would work:
>
> https://www.linkedin.com/posts/dtaht_the-mushroom-song-activity-6981366665607352320-FXtz
> Dave Täht CEO, TekLibre, LLC
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