From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-x230.google.com (mail-qg0-x230.google.com [IPv6:2607:f8b0:400d:c04::230]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 75BC221F624 for ; Tue, 8 Dec 2015 05:47:36 -0800 (PST) Received: by qgcc31 with SMTP id c31so15772261qgc.3 for ; Tue, 08 Dec 2015 05:47:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=U2ioeX4p7XVlnpJa1mAsabKi6a45N0vbicWScCDrfH4=; b=DB/mxeHsJ2GG/6q/caP47/NXaAtfMyRinGUobgVyis3XU8pKvWdHBthyLzodIo4lDb flXMNOHf8wO+4F64fJ/hPhcg5gx0YZmiHW0HfqppE0js0QvFp3hEsr9sHOVy1JxQzkZ0 lMW4S//ZsMMHf3RKFPJB6cQQzarrxPbmR1dFbBurW82SJ5vq+zpr5XgDwRoA5hr3KCmv GHhcjTafkMd7etz+4+qVSuz3X30IdVDHGaZF/zkGS34p2mOqJ08G+nxD1NsZ1CRDcWe9 X2I1Yl0CmQO3xf2xG7L0kLndQ+3N9571MzQPnVNACiRxYEOnNQZZTd/Vn7qgSRKiVaNo CUzw== MIME-Version: 1.0 X-Received: by 10.13.225.75 with SMTP id k72mr1969999ywe.48.1449582454695; Tue, 08 Dec 2015 05:47:34 -0800 (PST) Received: by 10.37.203.76 with HTTP; Tue, 8 Dec 2015 05:47:34 -0800 (PST) In-Reply-To: <5666AA19.6080000@darbyshire-bryant.me.uk> References: <5666AA19.6080000@darbyshire-bryant.me.uk> Date: Tue, 8 Dec 2015 14:47:34 +0100 Message-ID: From: Dave Taht To: Kevin Darbyshire-Bryant Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: cake@lists.bufferbloat.net Subject: Re: [Cake] openwrt was changing fq_codel quantum default X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.13 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, 08 Dec 2015 13:47:58 -0000 I did not like it when nbd changed the default quantum for the native qdisc= . So I support this change. That said, it has a negative effect at lower rates (50mbit and below), when unshaped, and that bugs me also. Dave T=C3=A4ht Let's go make home routers and wifi faster! With better software! https://www.gofundme.com/savewifi On Tue, Dec 8, 2015 at 10:59 AM, Kevin Darbyshire-Bryant wrote: > Did anyone else see https://dev.openwrt.org/ticket/21326 and fixing > commit https://dev.openwrt.org/changeset/47811 go through in the early > hours of this morning? > > > > TLDR; > > q->quantum =3D 300; //was > > q->quantum =3D psched_mtu(qdisc_dev(sch)); //now returned to kernel def= ault > > " i ran into cpu limits with sirq on archer c7v2 while testing ingress > shaping. > > it seems to me that quantum < mtu is very costly (at cpu) with higher > (50mbps) bandwidths > > ~40% sirq load with quantum 1522+ > 90% at quantum mtu/2" > > > > _______________________________________________ > Cake mailing list > Cake@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/cake >