From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-il1-x132.google.com (mail-il1-x132.google.com [IPv6:2607:f8b0:4864:20::132]) (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 413CF3CB35 for ; Tue, 23 Nov 2021 02:17:52 -0500 (EST) Received: by mail-il1-x132.google.com with SMTP id i9so15226364ilu.1 for ; Mon, 22 Nov 2021 23:17:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=Id2iRG2Ny3GBDPXyRe/vFmhrY1+eNGl0BSvnLQMubQs=; b=Ck6yb33zTQ/5F12YdLi19Y1RrIgi11dY8bhmzkPWvL82i/YwWiZsYqalMsZGWRA8Nr MDZ6Azhk/47AcAOFFSk5snjkOjNUPC0ZnUqT1EDKh5LE28ICdO1LXavZ9K8MuH0/2APu duPiv3TeWrxeRIRGtmWPA5ckx1P+8iB618j52GnPDTgk4iynoj1A3oRqzAfTR1njF7GS dzYilxnuW5iq8QXOh2ePCv2AOlVqJ96mcdwZSGYUtDaBinE+4SU6blc8a05Ds4ehSw72 GsyeOOsBjyKc38alUR+MwMwYeQs28aoaFRGD0x28u9Pzz0q0HQvBNp7Zjr44+lU1FbHf t1hg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=Id2iRG2Ny3GBDPXyRe/vFmhrY1+eNGl0BSvnLQMubQs=; b=Ej5UnVZ37YJFq3XrQcbmYWDN6T6UaAPxkJoa36cDhvCefRjqsIcxfq8kS5h6sD0pGC aHlae88FZyFiUy77ljtYpTAcMMEtMRtDKyOTCLolF+8UrHGjOwYftzmoJS8mV4Y8Mycv C6VAwj7mOc0y4f715+uk1Swp+L8B4XubQx3ulIifyATlp+V5Se3J+l25lYWGOoI18SXD DuWVFAOZpz8A14hKbeYgk2G/kF9ovak1X/WO5TWRChlBnvr00hoJ2zMb/SNUnJz2q+bv DnZYaAJUTuq0ORVE400JhzUrTd24B9xfG4nuE5mAaxo2K0XJk8gimgW+QwJl4ooSbqOj Qw6g== X-Gm-Message-State: AOAM530zaip9OgV7mrSLSm33TgVlBobd4TrftMhHQJfcUhIy64XXyWXD gV9ROZr4l4zhlpluiOGpVo3Xvo42D60EU4dtr4g= X-Google-Smtp-Source: ABdhPJzI2YAC8udgeUjtBSQBK2hepNNgPsFaldBLUpKf89LqMMNg4BNeBtyhnqzR1A3Lu8PEbtNBvR0qYaL0m7pn2/4= X-Received: by 2002:a05:6e02:16c9:: with SMTP id 9mr3160121ilx.221.1637651871523; Mon, 22 Nov 2021 23:17:51 -0800 (PST) MIME-Version: 1.0 References: <67BC6CC2-F088-4C0D-8433-A09F4AC452FE@gmx.de> In-Reply-To: <67BC6CC2-F088-4C0D-8433-A09F4AC452FE@gmx.de> From: Dave Taht Date: Mon, 22 Nov 2021 23:17:38 -0800 Message-ID: To: Sebastian Moeller Cc: Cake List Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [Cake] tossing acks into the background queue X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Nov 2021 07:17:52 -0000 On Mon, Nov 22, 2021 at 11:07 PM Sebastian Moeller wrote: > > Hi Dave, > > > On 23 November 2021 06:03:03 CET, Dave Taht wrote: > >ages ago I'd (we'd? I really don't remember - forgive me if I've > >forgotten who actually leaned in on it) written a basic ack-filter in > >ebpf. this was before cake gained tc actions and my primary use for > >the tech was for asymmetric connections, and before the good > >ack-filter arrived, and I was (and remain) unfriendly to this level of > >dpi. > > > >That said, on a symmetric connection, deprioritizing pure acks to the > >5% background queue nd then turning the cake ack-filter loose on it > >might actually work. > > > >Am I on drugs/is there any point? > > I think at leat when using multiple priority tins forward and reverse tra= ffic should by default use the same tin (I can see non-standard situations = that want differential treatment). The argument is that unlike earlier atte= mpts at ingress shaping that tried to throttle reverse ACKs? cake/codel do = proper 'hit the brakes' signalling via marking/dropping and we want that si= gnal to reach the other end as quickly as possible, no? My thought was basically an optional filter that steered all pure acks (no matter the classification) into the background queue. Non-pure-acks (sacks) essentially jump the background queue and signal that loss earlier. The backlog of other acks in background get delivered out of order, but purely out of order and discarded by the reciever. > Regards > Sebastian > > > > > > > > > >-- > >I tried to build a better future, a few times: > >https://wayforward.archive.org/?site=3Dhttps%3A%2F%2Fwww.icei.org > > > >Dave T=C3=A4ht CEO, TekLibre, LLC > >_______________________________________________ > >Cake mailing list > >Cake@lists.bufferbloat.net > >https://lists.bufferbloat.net/listinfo/cake > > -- > Sent from my Android device with K-9 Mail. Please excuse my brevity. --=20 I tried to build a better future, a few times: https://wayforward.archive.org/?site=3Dhttps%3A%2F%2Fwww.icei.org Dave T=C3=A4ht CEO, TekLibre, LLC