From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net (mout.gmx.net [212.227.17.22]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mout.gmx.net", Issuer "TeleSec ServerPass DE-1" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 2F9F521F8F9 for ; Fri, 30 Oct 2015 03:02:56 -0700 (PDT) Received: from u-089-d061.biologie.uni-tuebingen.de ([134.2.89.61]) by mail.gmx.com (mrgmx101) with ESMTPSA (Nemesis) id 0MQeET-1a3uLb0iJZ-00U6cR; Fri, 30 Oct 2015 11:02:54 +0100 Content-Type: text/plain; charset=windows-1252 Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) From: Sebastian Moeller In-Reply-To: <87611pfyy1.fsf@toke.dk> Date: Fri, 30 Oct 2015 11:02:50 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: <04B47ADF-415D-49DC-B613-7E11F8248A14@gmx.de> References: <87bnbqzyvj.fsf@toke.dk> <87611pfyy1.fsf@toke.dk> To: =?windows-1252?Q?Toke_H=F8iland-J=F8rgensen?= X-Mailer: Apple Mail (2.1878.6) X-Provags-ID: V03:K0:iBvHz2sU16+hpfUODesM9sOcepugkd/jK9+Y1XvOw4EPZ0AbROk tgI9xn7u+wq/tZPS5faZ8XigNQhxQhV50wlPxp30x9TVlTEq/+9vUM+D/BiaP94tYRSatSU F4BSu1oX9/9XY3EDz0Gm1rvHF/xTQ1gYjQdibQgfGrTxc9WqjJKGC3Swt+KFFObAlIbHwtE fIHT1qE1YZDQ2yRF+OfuA== X-UI-Out-Filterresults: notjunk:1;V01:K0:gwKROQtdrhM=:yQ83uGVGKIGth6Z8A6W64m feJI3TFo4I2GFC+Hi+5+50LG+X5gch5McfVZ2INhx3yhEFc1hUEWlaY6kDxbv/YKyQuyjMx9r DGSD8lFR0PtsxAggj/KsnF3kx/iTrd6no4eBoaTZlb4Tv2ccKSRmv2kpp3SorucGeQ/dd5BVx Z3F5JNgi4shMsvKsCfRqL+nkBkMd4KVLAMO+5CrrVKAbWRY04D5qyC/kL69fqFIRMXWOkTwzB hve1GhV9iH5cgJ3Qd8o0IJ8DhAuHuIDU/JhZkKz2qCX3qroEarN3dpbc6tin2VJJBg14yWAA7 CoX96so1l+SouBl7GhcnUBkeWPF/ykZuotJlsltct4Nshz1GLzEQMVjzwGAbfVtT7aLuGk13T z31YQyvtVO+s+kKRvIHO+zQIJQPwwM3+3KN4Ieo/5QWRIxjkGeNIXLd67HXkLM5jTJMtBaFEs jQA9fcXugp5Z2Nw0MeAvQCihwFMJCX+nnbUIytuN0HvfEYO8jvCpQH6jko/iQi42zLs5ltzAx fZPe50BYQ5MxhNGw+DtuANjqrGZdgr7+xhvn4lYnZal19eDHdnV4lM0RuV7EsdAY1QE0OnvEl X+EN+gFOzu5zD1juHGkmdPMtBPw3dLgU3NwDeGZn1TiBYQHJw9kUPyppCTW6sdvPhEwGxYK/T SYTN8wTYdLrgzwirLnF/yMQKVVmhZ7SOwTxz/okzPdVeaalLrqmNVBbKRdawHuKbbCNKrtKFe Yqv9jf/sauIpVNDcgDNpaPfmVVeNaVrq9uLYVg/POGXCq6Ari0UWc93I1Yy1X+OnKpkAJHMQl pEmfQtm Cc: cake@lists.bufferbloat.net 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: Fri, 30 Oct 2015 10:03:20 -0000 Hi Toke, On Oct 29, 2015, at 16:59 , Toke H=F8iland-J=F8rgensen = wrote: > Toke H=F8iland-J=F8rgensen writes: >=20 >> 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. >>=20 >> As you can see, the cake throughput levels off over long test = durations. >> Anyone has any idea why? >=20 > 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. Could this be some sort of thermal throttling? The plot reminds = me a bit of the currently popular plots of smartphone = performance/CPU-frequency over time under load over time=85 I do not = know whether the archer=92s cpu actually can throttle=85 If it would be = pure CPU-ooomph shouldn=92t it be there from early on, 200 seconds seem = too long to run out of resources like cache? >=20 > See the comparison graphs here: > https://kau.toke.dk/experiments/cake/archer/cake-30-50.png >=20 > That directory also contains the full Flent data files and packet = dumps. >=20 > 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=85 Maybe cooling it artificially during the test might reveal = whether the slow down is temperature dependent? I would test myself but = I do not own an archer C7=85 Best Regards Sebastian >=20 > -Toke > _______________________________________________ > Cake mailing list > Cake@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/cake