From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail2.tohojo.dk (mail2.tohojo.dk [77.235.48.147]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 85C7121F7AB for ; Tue, 28 Jul 2015 06:33:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at mail2.tohojo.dk DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=toke.dk; s=201310; t=1438090399; bh=5gm71fRSMb4IDG29bJEq/HOg7g8CMiDucNYUWlDN72M=; h=From:To:Cc:Subject:References:Date:In-Reply-To; b=Jq9nVl2/MulA+7+/vlVEyQbPel9vuTxtbvrVzBDNm8U7ybLabX9ZyBFqjdKc8Tb6R YNY067bMKwiopC3WvkYnK5UZyVy/SKO/atWHANUgpjbQhT6JDtkn574F6HwernFPlL RvscYpr1+xgXXZGOgEdcFmzTkwJUmZ/U4t8bNIps= Sender: toke@toke.dk Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 75C6341546; Tue, 28 Jul 2015 15:33:18 +0200 (CEST) From: =?utf-8?Q?Toke_H=C3=B8iland-J=C3=B8rgensen?= To: Juliusz Chroboczek References: <87a8ugqvid.wl-jch@pps.univ-paris-diderot.fr> Date: Tue, 28 Jul 2015 15:33:18 +0200 In-Reply-To: <87a8ugqvid.wl-jch@pps.univ-paris-diderot.fr> (Juliusz Chroboczek's message of "Tue, 28 Jul 2015 15:09:14 +0200") X-Clacks-Overhead: GNU Terry Pratchett Message-ID: <87r3nstnj5.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain Cc: bloat Subject: Re: [Bloat] AQM and PPP on Linux X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 28 Jul 2015 13:33:57 -0000 Juliusz Chroboczek writes: > I'm currently away from home, and using a 3G modem for Internet > access. I've found out that both NetworkManager and wvdial/pppd setup > the interface to use pfifo_fast (with a qlen of a mere 3 packets!). > Setting fq_codel manually appears to work fine, but needs to be redone > every time the modem has a hiccup. I don't think NetworkManager does anything to set qdiscs. The kernel simple sets pfifo_fast if not told otherwise (but see below). > Is that the expected behaviour? Shouldn't we be pushing patches > somewhere to change the default? What distro are you on? There's a sysctl to set the default qdisc: net.core.default_qdisc. Set this to fq_codel and you should be good to go. This is becoming the default in more and more distros (currently at least Arch and Fedora; and OpenWrt has been patching out pfifo_fast entirely for a while). There's a bug for Ubuntu here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1436945 -- feel free to bug them :) -Toke