From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-x243.google.com (mail-qt0-x243.google.com [IPv6:2607:f8b0:400d:c0d::243]) (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 F22E23B29E for ; Mon, 4 Jun 2018 13:08:53 -0400 (EDT) Received: by mail-qt0-x243.google.com with SMTP id d3-v6so6858391qto.1 for ; Mon, 04 Jun 2018 10:08:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=h0SaeDwi0fujv3iG9vhbo2szivGrru9qsLmIQLhvS30=; b=mDwGxPVmBxyVjERg5eTgeofIzjaw1k8dzXwnpFFWWvJxKgfOJ+eDKy8vGSXW3127hs 5m01EIQAuUsovOySPkfodmF/y+dstJU/YAhvS8lx5UkTDqJRbY9f0S+WbNqylmh4L7Cz TuU3Ii/D8jWa4LKe/TAALZxiplM115n1+XCGaOVA1vNgRzlAT8wWnDFh4ZzYXM4Fgs43 wSG3jIKqhyFcLQ+JGuUCK/EML4pOs0KJa48pnVnJtmEz7P0l09QTSW02upuHHTnydNbl NzBaSjSnK+H8JL1EiNiuYFABadVjLt1QpKEE3YWS49sNT6P7dg+zUO7BfwozTStTEhXq 5+AQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=h0SaeDwi0fujv3iG9vhbo2szivGrru9qsLmIQLhvS30=; b=i+CJVnONVx5Dc/7JAxSI8MPls2YfV5m2aO8qFEL0+GgDcSUBzFcfoamOnl6UPeLTwU EHOcAT5srkUcsT417BlnGgZXMJoz0ipUHq/QEGoBfHcIUoSugel7Oht7JB7LPf1AWbZx DeQK3szXdwxqM6Hv1JJPAyuRfAZTBu3ZkKPI1knPfcLAGtnmyZYIXGFd6s4s9eyY+qze MIGmKW3HWls8ok1nhtP9IIJ2UbGxN0Rfny7nE4r/zpLGUcrTNeQ0IAX/bkDC7wxURBxi sl76S/pA01wzq3HSMcNKf/d9okPCRPPSi8LOFLSOInnO0qgDGbSFo2ak6VsAGaUhY07t GujQ== X-Gm-Message-State: APt69E3Sf5zT0uFeMzb9Qsl9dTB5UikF1kxqbLgc5Zi3KEnzWFPXQHxg uHj1hlwskWuZPWFzycOLueRZ4B8j8OomGTVNWk0= X-Google-Smtp-Source: ADUXVKKENfl5qksO3IknY/lEolqs+7bMRZmvvXbIBRwDuVEKwtsPiG0oIArVrlkf7MboEyL2+e4b78jjNgEZRF9o8gQ= X-Received: by 2002:a37:646:: with SMTP id 67-v6mr19011701qkg.35.1528132133493; Mon, 04 Jun 2018 10:08:53 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:aed:24f0:0:0:0:0:0 with HTTP; Mon, 4 Jun 2018 10:08:52 -0700 (PDT) In-Reply-To: References: <152717340941.28154.812883711295847116.malone@soybean.canonical.com> <4f67f9b3-05a1-8d15-0aee-dfe8ea730d7c@gmail.com> <73c25a21-0ace-b5ee-090e-d06fb3b8dc60@kit.edu> From: Dave Taht Date: Mon, 4 Jun 2018 10:08:52 -0700 Message-ID: To: =?UTF-8?Q?Jonas_M=C3=A5rtensson?= Cc: "Bless, Roland (TM)" , bloat Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [Bloat] Fwd: [Bug 1436945] Re: devel: consider fq_codel as the default qdisc for networking 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: Mon, 04 Jun 2018 17:08:54 -0000 On Mon, Jun 4, 2018 at 6:16 AM, Jonas M=C3=A5rtensson wrote: > > > On Mon, Jun 4, 2018 at 1:28 PM, Bless, Roland (TM) > wrote: >> >> Hi, >> >> Am 24.05.2018 um 17:38 schrieb Jan Ceuleers: >> > Took 3 years after Dave approached them, but Ubuntu is finally adoptin= g >> > fq_codel as the default qdisc. >> >> Yes, if the Linux kernel is forwarding packets it makes a lot of sense, >> but I don't understand why it make sense for ordinary end-systems. >> Didn't Byte Queue Limits (BQL) suffice? Just curious... > > > Actually, for a long time now the codel wiki has recommended using sch_fq > instead of fq_codel for servers. That recommendation predates the tcp pacing change you note below. I'm pretty convinced fq_codel is now the best all around "default" qdisc, and we should rework our recomendation. > It seems Ubuntu defaulting to fq_codel is a result of using systemd which > adopted it as default almost 4 years ago. There was a request to change t= he > default in systemd from fq_codel to sch_fq in order to support pacing but > the issue was closed when tcp internal pacing was introduced in linux 4.1= 3: > > https://github.com/systemd/systemd/issues/5090 > > /Jonas > > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat > --=20 Dave T=C3=A4ht CEO, TekLibre, LLC http://www.teklibre.com Tel: 1-669-226-2619