On Tue, Nov 22, 2022 at 2:43 PM 'Bob McMahon' via BBR Development < bbr-...@googlegroups.com> wrote:
> 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**.* > I believe they are setting the xTSQ value using the sk_pacing_shift field, which was added here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3a9b76fd0db9f0d426533f96a68a62a58753a51e AFAIK the intent is only for drivers to set that, and there's no sysctl for that, but of course you could add a sysctl for testing if you wanted. :-) cheers, neal > 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.t...@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 >> >> -- >> You received this message because you are subscribed to the Google Groups >> "BBR Development" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to bbr-dev+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/bbr-dev/CAA93jw6yJU10wh9ajqX4yW2AvnJPStyWAAcV4%2BoQ8wSGsJgKZA%40mail.gmail.com >> . >> > > This electronic communication and the information and any files > transmitted with it, or attached to it, are confidential and are intended > solely for the use of the individual or entity to whom it is addressed and > may contain information that is confidential, legally privileged, protected > by privacy laws, or otherwise restricted from disclosure to anyone else. If > you are not the intended recipient or the person responsible for delivering > the e-mail to the intended recipient, you are hereby notified that any use, > copying, distributing, dissemination, forwarding, printing, or copying of > this e-mail is strictly prohibited. If you received this e-mail in error, > please return the e-mail to the sender, delete it from your computer, and > destroy any printed copy of it. > > -- > You received this message because you are subscribed to the Google Groups > "BBR Development" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to bbr-dev+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/bbr-dev/CAHb6LvrK_exkt_rbukYkF4_hwPXyy9T%2BZNGzdK79x91RrK49Mg%40mail.gmail.com > <https://groups.google.com/d/msgid/bbr-dev/CAHb6LvrK_exkt_rbukYkF4_hwPXyy9T%2BZNGzdK79x91RrK49Mg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . >
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