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 5773521F985 for ; Thu, 29 Oct 2015 08:59:21 -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=1446134358; bh=hFNNmhB4NJBB/Mz6kqQ6zH7fClSjfPogCK/RF8WS76w=; h=From:To:Subject:References:Date:In-Reply-To; b=FHbRmREnHG/ifJTXvgKJuDeNRwJ5Pf9Xroq6f9bPXXeV/PLFj9woeiV1ApUNGP+TK rs8HC3Yqe6LWFRROMIUaBzLKnrL3PCOhaXm7NNG3p8L39ral1nVHT7HFgkw8Vae73D w4JI2npM8od4RpQq+FI8NoZdZaaX8KtfXIh56Hm0= Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 0A49A49E0B; Thu, 29 Oct 2015 16:59:18 +0100 (CET) From: =?utf-8?Q?Toke_H=C3=B8iland-J=C3=B8rgensen?= To: cake@lists.bufferbloat.net References: <87bnbqzyvj.fsf@toke.dk> Date: Thu, 29 Oct 2015 16:59:18 +0100 In-Reply-To: <87bnbqzyvj.fsf@toke.dk> ("Toke =?utf-8?Q?H=C3=B8iland-J?= =?utf-8?Q?=C3=B8rgensen=22's?= message of "Thu, 22 Oct 2015 17:50:08 +0200") X-Clacks-Overhead: GNU Terry Pratchett Message-ID: <87611pfyy1.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: [Cake] Cake throughput levels off during longs tests 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: Thu, 29 Oct 2015 15:59:44 -0000 Toke H=C3=B8iland-J=C3=B8rgensen writes: > So I ran a couple of tests of Cake on the Archer-c7 on newest openwrt > trunk with sqm-scripts set to 30/30 Mbps. The attached graphs are the > result of equivalent fq_codel and cake settings. > > As you can see, the cake throughput levels off over long test durations. > Anyone has any idea why? Right, so did some more experiments, and this is definitely related to CPU usage. I did a new build of openwrt with an updated toolchain, and now the archer runs fine with Cake at 30 Mbps symmetrical. However, it starts to struggle at 50 Mbps; but only after around three minutes of continuous load. See the comparison graphs here: https://kau.toke.dk/experiments/cake/archer/cake-30-50.png That directory also contains the full Flent data files and packet dumps. So the question is now, of course, is there anything that can be done about this, or should we simply accept that the box is out of oomph? The way it behaves does strike me as weird... -Toke