From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-x234.google.com (mail-pf0-x234.google.com [IPv6:2607:f8b0:400e:c00::234]) (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 7449D3B260; Mon, 2 May 2016 13:44:50 -0400 (EDT) Received: by mail-pf0-x234.google.com with SMTP id 77so48980995pfv.2; Mon, 02 May 2016 10:44:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:subject:from:to:cc:date:in-reply-to:references :mime-version:content-transfer-encoding; bh=CAUZQxz+PoNjuMlIjkMssoQMxpuav+si8UjTFzScTJI=; b=0zCqT0NcxLxttmiqKFOTctmUguOD8aJiuS2OQqAqJZILBbGw56muceWEbaX2NfaS0C i1U7r4HG/bLUbD4+SeR1TGYF3S4OE4SVil24WqawHv1t3ltiTiaKRuHBA7RXXrcLQjMU Ut30ZjaUv1pBgHsQ/Jaz0qzEx89Udrgxp6LgZL4+RVPsE3e7xa3p6fABGSgMkTU5O7ae 7rrnZkwKORIInglrhDEORa691AfGa4ZIZjXglsCPiio1N1XpSH/fKiWkZR2JFX2jdTxU ecQmkich0tmAc4jxrEV3pxls24b5kddvc3SVoh8b9CdvCYGCJDmLgdldmEtrT6K5dPVs mbiQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:subject:from:to:cc:date:in-reply-to :references:mime-version:content-transfer-encoding; bh=CAUZQxz+PoNjuMlIjkMssoQMxpuav+si8UjTFzScTJI=; b=UqXa+SDUhe9VyM8a548Ony1Be0U7/IG9/txIh0BWZosVcq2PM16MOMY3WBBCbdpi5N hlJLDwcf3JqgKGg76d1wGGy8rWIJDG3WS0H4OT44vTq/eWKkbm6LJsXH1DXbIcoSPUqr G+sySys1UoUts7TuSeOd0k+2fV2UyoJJZM4Qg/0e5fwmBBWdAUDsUQWTrMVNh/SE55/U 13oZclGxbdl533dnQpeKs2kdje8UtlwyDRuag7FamCUGAFcXwtFiiTJgkGl2anviwgc9 umKO/5jAev6GZ4yzcBnSl/Bkl8i/uucIm5/vwxdfHCPfo5VhP1z29/xQLQBMP80L8+mK TG2Q== X-Gm-Message-State: AOPr4FXrfg433/g+ZzFQ+4bP2LPnY7HvSvFL9oBoOVK458iTEeAH20C9jya2jxNABHTGzQ== X-Received: by 10.98.95.4 with SMTP id t4mr31434302pfb.162.1462211089685; Mon, 02 May 2016 10:44:49 -0700 (PDT) Received: from ?IPv6:2620:0:1000:1704:b5a3:bf52:77a3:bc9a? ([2620:0:1000:1704:b5a3:bf52:77a3:bc9a]) by smtp.googlemail.com with ESMTPSA id ve11sm47268200pab.21.2016.05.02.10.44.48 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 02 May 2016 10:44:48 -0700 (PDT) Message-ID: <1462211088.5535.262.camel@edumazet-glaptop3.roam.corp.google.com> From: Eric Dumazet To: Dave Taht Cc: Roman Yeryomin , Jonathan Morton , make-wifi-fast@lists.bufferbloat.net, "codel@lists.bufferbloat.net" , ath10k , Michal Kazior Date: Mon, 02 May 2016 10:44:48 -0700 In-Reply-To: References: <1462125592.5535.194.camel@edumazet-glaptop3.roam.corp.google.com> <865DA393-262D-40B6-A9D3-1B978CD5F6C6@gmail.com> <1462128385.5535.200.camel@edumazet-glaptop3.roam.corp.google.com> <1462136140.5535.219.camel@edumazet-glaptop3.roam.corp.google.com> <1462201620.5535.250.camel@edumazet-glaptop3.roam.corp.google.com> <1462205669.5535.254.camel@edumazet-glaptop3.roam.corp.google.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4-0ubuntu2 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: Re: [Make-wifi-fast] [Codel] fq_codel_drop vs a udp flood X-BeenThere: make-wifi-fast@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 May 2016 17:44:50 -0000 On Mon, 2016-05-02 at 10:08 -0700, Dave Taht wrote: > On Mon, May 2, 2016 at 9:14 AM, Eric Dumazet wrote: > > > > I want to check your qdisc configuration, the one that you used and > > where you had fq_codel performance issues > > > > tc -s -d qdisc > > Not sure it's the qdisc version under test here. ? If it is, I'd be > perversely happy as for the first time ever the wifi layer started > exerting some backpressure on the upper layers of the stack. I wrote fq_codel with a configurable limit of packets. Default is 10240 I want to see what limit was set on this particular qdisc. All qdisc are going to drop hell of packets, if say limit is set to 5. Claiming they are buggy is quite misleading. fq_codel was designed with the hope of dropping in excess packets at dequeue() time, not enqueue() time. Apparently someone did not understand this part.