From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ej1-x636.google.com (mail-ej1-x636.google.com [IPv6:2a00:1450:4864:20::636]) (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 27D963CB52 for ; Tue, 6 Jul 2021 18:14:11 -0400 (EDT) Received: by mail-ej1-x636.google.com with SMTP id gn32so52291ejc.2 for ; Tue, 06 Jul 2021 15:14:11 -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; bh=J+GGvAjcVUPyAYcIwVLYpeOEdsIpfcl40qEgnTi2A8I=; b=UqqDJj7aRwiASfvzs0RKR4sip8Zpzo+v2vpoT+9nfCRf5FIpXmTlzPSZJpceVuPVMc 5wN44LR/TLih2E/tKJenVe/O692tbJC3dxfX3vX9vZPZFz1JXCNJA5zeWF4tJ+A1r3te s/MmZQbNPZ8GKSRQ/KiRH/O/jNjQ4OwOweH4FXoTA8AMDCkj5m5ezRtLGuoaAjM7VG6A oM0thcZMjxcTp5n+Ip5InoP00nPalaR0Y67wEGiE5pjBBoNNuLdpPjm4WaKh6TCGYCN8 0WqPDfOYpzH4305NdZEt8OtSvHETgVI8i1gmu05h6odKD+2oh+xNrd2SZ2et0ZOHRZ90 PTCg== 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; bh=J+GGvAjcVUPyAYcIwVLYpeOEdsIpfcl40qEgnTi2A8I=; b=B5DSPU7fQvaO0cY9s+IpcqcgOBuceShhEEPeYkHbtopbSSDHwt8iWOgHO+8twcRwQN Vu6ZeTZi3hi+ZpXVsUsZvnxZ9OMzvrDW/JOclHbhQ8ELvyADXI1dCOnzllZCXguvDV0I pOyBTGCdASRzyp15rZE1PwzNyepuA3/EZhTLf2OAsWk0coFUxh88Ua6ABhPnUBOw+JKx 7H8QRS4PHubFfuiEuDqbchuvx4wxUoT8gB+d57a2dcvJXxUDvDY9zkl/MDOKTuCMdfXx zpL2lJK6Hbte4ex3E40QuAe3MNCwR3LbKdSJbHQ+9kKHfWm5q+UK56UDOd9SO5V/OaOV dHTA== X-Gm-Message-State: AOAM5301qDBRhVKf3cUvFs0RhVOg+JYiRYzcemZATQsjPrltxINVsIAg xjCQGUCCUXdNhPCRna+KNX5pm76JkvGKKGxHtbc= X-Google-Smtp-Source: ABdhPJxlRLsszSfTVnYDynNl2uLh7fn+EWjBGwT69pyB+dwzH7YoqrniDzWBxqNWakljjfVPcrmjrTk7Pviv3siIXXE= X-Received: by 2002:a17:906:1704:: with SMTP id c4mr21204143eje.182.1625609650020; Tue, 06 Jul 2021 15:14:10 -0700 (PDT) MIME-Version: 1.0 References: <20210621210048.628befdb@hermes.local> <38CC4C4D-AE42-4629-8472-16BCC0DEAFEA@gmx.de> <383273DA-3700-469D-9FE2-524C9D21C4DA@cable.comcast.com> In-Reply-To: <383273DA-3700-469D-9FE2-524C9D21C4DA@cable.comcast.com> From: Aaron Wood Date: Tue, 6 Jul 2021 15:13:59 -0700 Message-ID: To: "Livingood, Jason" Cc: Sebastian Moeller , "bloat@lists.bufferbloat.net" , Stephen Hemminger Content-Type: multipart/alternative; boundary="000000000000bba4c005c67bbd80" Subject: Re: [Bloat] Really getting 1G out of ISP? X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Jul 2021 22:14:11 -0000 --000000000000bba4c005c67bbd80 Content-Type: text/plain; charset="UTF-8" Are these in-flux changes to where the upstream split is why some modems report DOCSIS 3.1 downstream, but only 3.0 upstream? (and therefore aren't enabling AQM on the upstream?) -Aaron On Tue, Jun 22, 2021 at 4:04 PM Livingood, Jason via Bloat < bloat@lists.bufferbloat.net> wrote: > > For DOCSIS the issue seems to be an unfortunate frequency split between > up and downstream and use of lower efficiency coding schemes. > > Performance really takes a big step forward once a person has a D3.1 modem > in their home, bringing OFDM and OFDMA as key advancements. Also in flux at > the moment is where the upstream split is in cable networks, which are > moving to mid-split or high-split designs that bring more upstream > bandwidth. As well, over the past 18+ months, most cable networks have > added substantially more upstream channels as well as performed quite a > number of fiber node splits. And that is just below the physical layer > stuff - there's also a lot of work at the software layer for modems and > CMTSes that is quite interesting. > > JL > > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat > --000000000000bba4c005c67bbd80 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Are these in-flux changes=C2=A0to where the upstream split= is why some modems report DOCSIS 3.1 downstream, but only 3.0 upstream? = =C2=A0(and therefore aren't enabling AQM on the upstream?)

-Aaron

On Tue, Jun 22, 2021 at 4:04 PM Livingood, Jason via Blo= at <bloat@lists.bufferblo= at.net> wrote:
> For DOCSIS the issue s= eems to be an unfortunate frequency split between up and downstream and use= of lower efficiency coding schemes.

Performance really takes a big step forward once a person has a D3.1 modem = in their home, bringing OFDM and OFDMA as key advancements. Also in flux at= the moment is where the upstream split is in cable networks, which are mov= ing to mid-split or high-split designs that bring more upstream bandwidth. = As well, over the past 18+ months, most cable networks have added substanti= ally more upstream channels as well as performed quite a number of fiber no= de splits. And that is just below the physical layer stuff - there's al= so a lot of work at the software layer for modems and CMTSes that is quite = interesting.

JL

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