From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-x234.google.com (mail-qt0-x234.google.com [IPv6:2607:f8b0:400d:c0d::234]) (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 2AF3D3B29E for ; Sat, 21 Jul 2018 18:28:53 -0400 (EDT) Received: by mail-qt0-x234.google.com with SMTP id q12-v6so13356192qtp.6 for ; Sat, 21 Jul 2018 15:28:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=B13yqykx8fhd51v66C2cFnUHAB5u5ba3sgHQVc3FgL4=; b=Pl4gs9cTwYEtd179V64MyaK7OsautE3G2p+j6kS1Hd2Hz21ZoYF+4qlnD/Kfca7c+c C6Hss3IWLD/VcLfGACQeQtqVG3MD27pLMJp18E0dfJZTKRUfGN3DKUW+KollbXzULyv4 Lqi+sikYqDgatkxYBhIoyKc/ncni1VBSLeBy8P6fk5RGEsGUxTjx+hv+SHF1W8nheSAL 7qxM3C7A0vBlBAx/kYq5vwjumOvgKMVt2gHWRju0nrqgtOnuhoaFXxnX5oU6D5ePvaZX e2IGDmuCI9DXFS667qcrk4fmA4+o1WaZ3YHIFcSw58zCBcGpJ1eyGz6SCFxbfiuWYblf O2NA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=B13yqykx8fhd51v66C2cFnUHAB5u5ba3sgHQVc3FgL4=; b=kLj0ZEmkz4bpOHEm/yg/LiG8lrWkG0gN7WuA4DsM2IS393C4gStD0PAAtO1YjJhouH +stfTkZfMarU6iq3VzNptMZd0OL7cN54OT/XYvcMJyr+xcAvc3tX8avCYZhL81m8oKql T5k6q7VGmcfq0Q3j6/e9+eDwT5p8aedKR91bTPk2vxC+B0KcfwvygiO/RFc7E58yCcFe OgprpvsdxY6BPQ++3Y/w3zlXzxs4+e7UzmjHOXcLzLQF/Bi8Pg7c63BjJSsElaHLHPT7 pvVBDKO1h4ffuMFMyNbZXHSbzjuG3O4k9RJbpCcfxrn3t6GnSwSsKwh8b7ILlGLe9OpC 6VBg== X-Gm-Message-State: AOUpUlHByxDF2LjAR5OXPyWoWTfx8oDtIOU19mMtUuP7g1lvgbhxcDxX 56vTdSul3WeNvFtzzq38QglyfBBhg7gu8P3O+d/q3EdF X-Google-Smtp-Source: AAOMgpdxCsCcDtZDM2CmkTrkd7q5XUPK+oYSOxBo+dqerE2++f0skom5yUWxS0IvlrozKRCCmnsNLcL0Lzq42HX49qg= X-Received: by 2002:ac8:354e:: with SMTP id z14-v6mr7141142qtb.261.1532212132643; Sat, 21 Jul 2018 15:28:52 -0700 (PDT) MIME-Version: 1.0 References: <4C129A60-21D3-4B78-A764-DC8E2CD7E4DF@gmail.com> <6839ba220fe4399eba3620620515fc1dd801a509.camel@gmail.com> In-Reply-To: From: Dave Taht Date: Sat, 21 Jul 2018 15:28:40 -0700 Message-ID: To: Arie Cc: Cake List Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [Cake] inbound cake or fq_codel shaping fails on cable on netflix reno X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 21 Jul 2018 22:28:53 -0000 hmmm... And wow, does this modem have difficulty with udp Summary of ping test run 'hping3-cake-docsis' (at 2018-07-21 22:22:14.75820= 1): avg median # data pts Ping (ms) ICMP : 26.50 23.20 ms 2395 Ping (ms) UDP : 1.02 44.21 ms 47 # That's like a bazillion percent packet loss and explains why irtt is having such difficulty. Thank you very much for clues as to what's being going south in my lab. I had no idea this problem at this low layer was so common: http://badmodems.com/Forum/app.php/badmodems On Sat, Jul 21, 2018 at 3:13 PM Dave Taht wrote: > > wow. That is the best dslreports test result for cable I have ever had. > > with hping3 -2 -d 0 -s 10080 -k -p 80 -i u150 96.120.89.153 > > http://www.dslreports.com/speedtest/36209937 > > Without: > > http://www.dslreports.com/speedtest/36210095 > > You say a different cablemodem does better without hping3 running? which?= :) > > Most of my production gear is based on an older arris modem (which is > quite good), most of my test gear is a bunch of netgear (free) modems > and service I got free from my time working for comcast. > > I haven't got around to springing for a docsis 3.1 modem yet (they are > awfully pricy). > On Sat, Jul 21, 2018 at 2:37 PM Dave Taht wrote: > > > > or, another way we might look at it is there is very little we can do > > as the cmts has to have data in it in order to burst schedule the mac > > for the next string of packets, much like how fq_codel for wifi has > > "one in the hardware, one ready to go", a cmts has at least one in the > > hardware (per channel? a multiple? what?). > > > > or I could be on drugs entirely. And this thread did start with > > fast.com misbehaving badly regardless of the shaper in place or not, > > which is not what I'm looking at now. I need to setup a 45ms rtt > > test... > > > > anyway, as per your suggestion, the latency gets MUCH better with your > > hping3 idea running, which implies that we've been fooled all along > > by the rrul test. On the other hand, I think this will hurt other > > cable modems on the same wire. On the gripping hand, I'm happier > > knowing that with a busier network, docsis cable, when shaped, gets > > better, and that I should junk my existing test cablemodem due to the > > persistent spikes I see. > > > > I wonder if it's the sent path or the return path shattering latency > > so well? I wonder if hping3 would count against your badwidth cap? > > > > going back to trying to figure out why fast.com is so gnarly > > On Sat, Jul 21, 2018 at 2:18 PM Arie wrote: > > > > > > I had a similar issue with my previous cable modem, whatever I shaped= to didn't matter, I still had long delays. I "fixed" it by continuously se= nding a stream of empty UDP packets upstream: > > > > > > hping3 -2 -d 0 -s 10080 -k -p 80 -i u150 IP-OF-FIRST-OUTSIDE-CABLE-HO= P-HERE > > > > > > On 21 July 2018 at 22:36, Dave Taht wrote: > > >> > > >> This is my "inbound trying to shape a cable connection" smoking gun. > > >> The delay curve is the same > > >> shaping the 110mbit cmts down to 85mbit OR 55mbit. > > >> > > >> _______________________________________________ > > >> Cake mailing list > > >> Cake@lists.bufferbloat.net > > >> https://lists.bufferbloat.net/listinfo/cake > > >> > > > > > > > > > -- > > > > Dave T=C3=A4ht > > CEO, TekLibre, LLC > > http://www.teklibre.com > > Tel: 1-669-226-2619 > > > > -- > > Dave T=C3=A4ht > CEO, TekLibre, LLC > http://www.teklibre.com > Tel: 1-669-226-2619 --=20 Dave T=C3=A4ht CEO, TekLibre, LLC http://www.teklibre.com Tel: 1-669-226-2619