From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net (mout.gmx.net [212.227.15.15]) (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 B5CDD21F4FA for ; Sat, 24 Oct 2015 01:07:13 -0700 (PDT) Received: from hms-beagle.home.lan ([217.237.68.126]) by mail.gmx.com (mrgmx002) with ESMTPSA (Nemesis) id 0Md3ZK-1a71IZ2qMk-00IEdA; Sat, 24 Oct 2015 10:07:05 +0200 Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Content-Type: text/plain; charset=windows-1252 From: Sebastian Moeller X-Priority: 3 In-Reply-To: Date: Sat, 24 Oct 2015 10:07:18 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <562A5BE5.6010101@gmail.com> <12883.1445625688@sandelman.ca> <562A9611.4050403@gmail.com> To: "David P. Reed" X-Mailer: Apple Mail (2.1878.6) X-Provags-ID: V03:K0:hdc/509Sck68pFvNhdUqcA6xTQWoim9SUYPFcAbTZtzsrX/zYYF 2ijPOQ05AUgfpV1pU8b42Z37g+eSr0C4no4drx1iaj6lla0s3qjlJbtFsGjinXdvrOkxHTH NPSBED0cZAaMVOVicYIVkvVLHCV10pIbBSQ7O4Qqt6e4z6ns47Ylyg395gOsCOJK35dhv3u tFpL5QV7IJfxzSEWBiNFw== X-UI-Out-Filterresults: notjunk:1;V01:K0:u42JeT7zhzs=:25abHkoxUBX9E4ALMRnTf7 6yJUbY8aimpeqwo71RrbwbYJlujyQ/KSjFVwOrrYjWd15BvqGXjlHlMaNxapWuqyEMeoR2O3E a4k/8CQ+rKsAXNU0f6s9wlTihCoC2btaHBJg46QXX28OZBu6J2FC102ZtmWX4dDeY9wRV2cEK F5V9ZzFoWvxveKiDSlCeqkkCOoNFVaAQNGVbNURCu1rLf2uw8nr49MszMYBUo115niAZeR2FG U/JLwa9w85JUAswDXd0pi7DzREq11PTQloYesTC70zeE4n0zRTMYM2MFeukU+f/wbeteGCzBq 9qM13tGx5pftW5lFeMUn9Ibw2WGtk22u4P55phEiuBaqt3MuAMv2+Qq2+zBaTxAPejDl6PD/2 t8na+mdHNqdWp6rCtta/FnyjYso4NW+jriHlB1v40JtVhjzBQRTvNDnKnqU34QsAGOtuoOAr0 dgY4gs0etmMzpTiLQPAVGxJigkchCGLcsi5u8IBzL2peLn9UYhVsBjcW+Sa3Rj8nPzdXmUcT6 F5lJQoSO7hmg75TzgixzGX+kYvJiMKjianjaPC5Tfpl05/zX4Qb/1lFtmnjzRSNAGUq19JJ4s BBQs4gWqp3kojh/8USKgGTrWTuoIu85IkGlVeNzkDRHU43iB+kty/e2c8iQgQ3sbkO4yiabI9 qTGr/nkSG6vNNVKW0X/1skChy8as/+Q8AKHZ7mXjyt++4VqvyqDR0A1yBCe/gx5IVSi9diuvu VR1E87FvBF60bNz/BZt4EIEPw8O3yJfbZDmcaqwjoKw4RQEGOPm6VMpR6F1YoMIO1TVYoKeyD VWhNeNj Cc: cerowrt-devel@lists.bufferbloat.net Subject: Re: [Cerowrt-devel] Problems testing sqm X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Oct 2015 08:07:36 -0000 Hi David, On Oct 24, 2015, at 00:53 , David P. Reed wrote: > In particular, the DUT should probably have no more than 2 packets of = outbound queueing given the very small RTT. 2xRTT is the most buffering = you want in the loop. Let=92s not haggle about the precise amount of queueing we deem = acceptable, as long as we all agree that >=3D 2 seconds is simply not = acceptable ;) (the default sqm will approximately limit the latency = under load increase (LULI) to roughly twice the target or typically 10 = ms; note that this LULI only applies to unrelated flows). The exact = number of queued packets seems to correlate with the beefiness of the = DUT, the beefier the fewer packets should work, wimpier devices might = need to batch some processing up, resulting in higher LULI=85 Best Regards Sebastian >=20 > On Oct 23, 2015, Richard Smith wrote: > On 10/23/2015 02:41 PM, Michael Richardson wrote: > Richard Smith wrote: > My test setup: >=20 > Laptop<--1000BaseT-->DUT<--1000baseT-->Server >=20 > So, given that the DUT is the only real constraint in the network, = what > do you expect to see from this setup? >=20 > Given that the probably DUT can't forward at Gb/s, and it certainly = can't > shape anything, it's gonna drop packets, and it's probably gonna drop = them in > Rx, having overrun the Rx-queue (so tail-drop). If there is too much = ram > (bufferbloated), then you'll see different results... >=20 > Setting ingress/egress to 10Mbit/s I expected to see the speed=20 > measurements bounce around those limits with the ping times staying in=20= > the low double digits of ms. What I saw however, was the data rates=20 > going well past 10Mbit limit and pings up to 2000 ms. >=20 > This is what I've seen in prior rrul testing using a the 50/10 cable=20= > link at our office and my 25(ish)/6 link at my apartment and a well=20 > connected server on the net. That however was using QoS and not SQM. >=20 > Its that a reasonable expectation? >=20 > -- Sent with K-@ Mail - the evolution of emailing. = _______________________________________________ > Cerowrt-devel mailing list > Cerowrt-devel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/cerowrt-devel