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)

--
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Dave Täht CEO, TekLibre, LLC

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