From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lj1-x229.google.com (mail-lj1-x229.google.com [IPv6:2a00:1450:4864:20::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id A85D43B29E for ; Tue, 22 Nov 2022 14:43:04 -0500 (EST) Received: by mail-lj1-x229.google.com with SMTP id t10so19163102ljj.0 for ; Tue, 22 Nov 2022 11:43:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=eWteMB3IKxmqjvP+HwnWGiEGhE/4yT+gFDMD6fU+Q10=; b=QmTapjtD2dogyFCAlbOQY4XuXcMjj7jTqeZ1rIrzJoES1ifhapHhRvVyeuJZyRMdNl k3QdPWGuLuHqQUXHI1Z60+XwrHP4arQGTpWrOtkMb3EC/B2rYEOJskhovLyGJhicX0J9 XnzT+w00gdo+iwvKEq2FkUuWNDur3IpvvJwbA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=eWteMB3IKxmqjvP+HwnWGiEGhE/4yT+gFDMD6fU+Q10=; b=MiPMpKyApKz4WjXqaPv8BE0xLEineiF5FPq9c+kAPgBGGUBJ+bfIpse/nsGL1YO4fR P21eYO/d7auJnwfJTLh6liiJujg3bDmPD4KPeR9EFyZsQd3pUviZ/swmbgSM6hKMlipl gU6esnUUNth4gTCet8BlAKsmxkAU0IRFya5RBZqFbZrRwGNjYNIDP8uGz4rK2O+pGmAB VP86jeEKf5V/3vgNNFj/Kpm9axG6Rvay7xuLPNxE54+56EiqoPZLp2Jbaft8h1i1JAVb Nl6+ubF5S+ha2tEOUq8dTAlRnHGPfaTwAT6/P5ByDVMwXzMEyBJg9hoUp3yVq3Pxq59e q6rA== X-Gm-Message-State: ANoB5pk6nysm4XcFhadrnhtV/d6OYi7yyLJjIoQPjye0cNiJHWku54h0 nEr5SthOT/Ns0bfDFQjrK4PQqcJBQ97ayNVyDprlbekAusBhughXaspQA9Aq9pMS1w7K5IWibXI SBtfQnCUZmeFM2dWXGKpbEf2UAFhxSw== X-Google-Smtp-Source: AA0mqf4bxCKHTwQ65NrjpVXHl/BWY8zh+DIUsF+c39QqstAVVyzSn734yK6lBt3cMzT0fxbY2FKLNJFeqXPlLtPURbw= X-Received: by 2002:a05:651c:241:b0:26d:e38f:7e21 with SMTP id x1-20020a05651c024100b0026de38f7e21mr7699271ljn.273.1669146183021; Tue, 22 Nov 2022 11:43:03 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Bob McMahon Date: Tue, 22 Nov 2022 11:42:50 -0800 Message-ID: To: Dave Taht Cc: Make-Wifi-fast , bloat , BBR Development Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000059d5d505ee14618a" Subject: Re: [Bloat] [bbr-dev] Aggregating without bloating - hard times for tcp and wifi X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Nov 2022 19:43:04 -0000 --00000000000059d5d505ee14618a Content-Type: multipart/alternative; boundary="000000000000519cae05ee146189" --000000000000519cae05ee146189 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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 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=3D9772053 > > 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-698136666= 5607352320-FXtz > Dave T=C3=A4ht 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+unsubscribe@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/bbr-dev/CAA93jw6yJU10wh9ajqX4yW2AvnJPSt= yWAAcV4%2BoQ8wSGsJgKZA%40mail.gmail.com > . > --=20 This electronic communication and the information and any files transmitted= =20 with it, or attached to it, are confidential and are intended solely for=20 the use of the individual or entity to whom it is addressed and may contain= =20 information that is confidential, legally privileged, protected by privacy= =20 laws, or otherwise restricted from disclosure to anyone else. If you are=20 not the intended recipient or the person responsible for delivering the=20 e-mail to the intended recipient, you are hereby notified that any use,=20 copying, distributing, dissemination, forwarding, printing, or copying of= =20 this e-mail is strictly prohibited. If you received this e-mail in error,= =20 please return the e-mail to the sender, delete it from your computer, and= =20 destroy any printed copy of it. --000000000000519cae05ee146189 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Thanks for sharing this. Curious about ho= w the xTSQ value can be set? Can it be done with sysctl?

We conti= nue 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 imp= ortant 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 b= e 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 empt= y (i.e. no more packets available to the driver from the TCP stack) per tha= t 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 transmis= sions, i.e. multiple WiFi clients are active and sharing TXOPs.

Bob<= /div>
On Mon, Nov 21, 2022 at 10:04 PM= Dave Taht <dave.taht@gmail.com> wrote:
Th= is 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/stam= p.jsp?arnumber=3D9772053

as for wifi6... don't make me start talking about wifi6... but some of<= br> 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-FXt= z
Dave T=C3=A4ht CEO, TekLibre, LLC

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This ele= ctronic communication and the information and any files transmitted with it= , or attached to it, are confidential and are intended solely for the use o= f the individual or entity to whom it is addressed and may contain informat= ion that is confidential, legally privileged, protected by privacy laws, or= otherwise restricted from disclosure to anyone else. If you are not the in= tended recipient or the person responsible for delivering the e-mail to the= intended recipient, you are hereby notified that any use, copying, distrib= uting, dissemination, forwarding, printing, or copying of this e-mail is st= rictly prohibited. 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