From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mail.toke.dk; spf=pass smtp.mailfrom=; dkim=pass header.d=gmx.de header.i=moeller0@gmx.de; arc=none (Message is not ARC signed); dmarc=pass (Used From Domain Record) header.from=gmx.de policy.dmarc=quarantine Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) by mail.toke.dk (Postfix) with ESMTPS id 4D27A701C4E for ; Sun, 28 Sep 2025 14:11:11 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmx.de; s=s31663417; t=1759061471; x=1759666271; i=moeller0@gmx.de; bh=ehkAquuNFrItykKmFOFrHnxhf2jo13QTf3miDz+4SbY=; h=X-UI-Sender-Class:Content-Type:Mime-Version:Subject:From: In-Reply-To:Date:Cc:Content-Transfer-Encoding:Message-Id: References:To:cc:content-transfer-encoding:content-type:date:from: message-id:mime-version:reply-to:subject:to; b=e2nslRuLT9mHojrbMA9Fz9hOoE69Ti8EG2ktRASYfofi7goXH/6JUZUWlgFQFGgt McSEdkOuuAbACKZCFiEz50RV6BpWOQ4ZdzYpnl7WTy1cN834uRX7zFuDojpCYFhMo fQN2F1D7kCcBaCZ9gwlokJVcvenK2mBOmrtHnjLjunI53CBLB7HcvbHCy9dTDojpX XRuc7ImPw4VYbol+48KwGNIxRJTSn0baLhqHw8ISoqBAO8XRLaSAycbMzwGt6d2IZ lUw5Jqpt8QftqLV/dBuk+b5Zxal8x6EM3Kl3kv8yPliwZqqRJ8AYd+2Q2OkKwrCrK agz9AgFt7D76MWLRgg== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from smtpclient.apple ([185.104.138.140]) by mail.gmx.net (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MJVDW-1uj7V02pMu-00Obux; Sun, 28 Sep 2025 14:11:11 +0200 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3826.700.81\)) From: Sebastian Moeller In-Reply-To: Date: Sun, 28 Sep 2025 14:10:58 +0200 Cc: cake@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: <06DAA0CB-70EF-4FDD-BD3D-16A4FC28AD12@gmx.de> References: To: David Lang X-Mailer: Apple Mail (2.3826.700.81) X-Provags-ID: V03:K1:aq4MG2U9Ha6XbTxlk1lIzM3JyZayH2vnWsdFD6Y4uT0HsternAc zzLUe7Zuv7bFefk8zuabv9c+42TsLpAGjoC6/S2gC3fBX/9YIPnCQW5Slng3YOWm9QKzW0p 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on a large network List-Id: Cake - FQ_codel the next generation Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Hi David, while I have no real answer for your questions (due to never having had = that kind of load in my home network ;) ) I would like to ask you to = make take scripted captures of tc -s qdisc for the wan interface is = reasonable short intervals (say every 10 minutes?) as that might be just = what we need to actually answer your question. > On 28. Sep 2025, at 13:06, David Lang wrote: >=20 > I'm starting to prepare for the next Scale conference and we are = switching from Juniper routers to Linux routers. This gives me the = ability to implement cake. >=20 > One problem we have is classes that tell everyone 'go download this' = that trigger hundreds of people to hammer the network at the same time = (this is both a wifi and a network bandwidth issue, wifi is being worked = on) So one issue might be that with several 100 users the default = compile-time size of queues (1024, IIRC) that cake will entertain might = be too little, even in light of the 8 way assoziative hashing design. I = believe this can be changed (within limits) only by modifying at source = and recompilation of the kernel, if that should be needed at all. I wonder whether multi-queue cake would not solve this to some degree, = as I assume each queue's instance would bring its own independent set of = 1024 bins? > The network is pretty flat, a couple of subnets each on ipv4 and ipv6. >=20 > Any suggestions on how to configure cake for this sort of environment = where there are so many devices? Maybe switch to a simpler pure per-flow isolation mode than the default = triple-isolate? BTW what kind of uplink capacity will you use? >=20 > David Lang > _______________________________________________ > Cake mailing list -- cake@lists.bufferbloat.net > To unsubscribe send an email to cake-leave@lists.bufferbloat.net