From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-x22a.google.com (mail-lf0-x22a.google.com [IPv6:2a00:1450:4010:c07::22a]) (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 B1CF93CB39 for ; Wed, 24 Jan 2018 19:15:04 -0500 (EST) Received: by mail-lf0-x22a.google.com with SMTP id h92so7523778lfi.7 for ; Wed, 24 Jan 2018 16:15:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=gl3kZBIeaPchutYZbI7tbYDxXXRBvcVSITV5LQ+7NlA=; b=b2W50zlzk+4tl4F4HtADw6pH80jAkUbIB4IODIRG1G9VEqbl1pnhtalf3xrs3SYS91 8iqzUuD04OBke91ppOD+3jrV4IN+/uR6yfBhHxf36+1S5j+ZXioF4UJKiTWIQkGLAoMd 1AInOTSjr1LosDLr/66aC3nSWk30Zl33NMbWKvWODzQhGpilsi1bIP+LC/gf18dScK/i bQypbDQQpqG9PdtpA7I+BDTE9iJQJE/vFaOIsV0vERRaK1jZE62kGqAOqjM8/Wr5+FLa zJwr8tZ48DmuDz3Cne4M6c6q1H/67BRobnG3x/kt91/aE9BH+Bb7FAs6moyw0JVCtDPn 23fg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=gl3kZBIeaPchutYZbI7tbYDxXXRBvcVSITV5LQ+7NlA=; b=N6Q9PYq4WmRUu95sVV1I4wPHj0BowKIbZTCsPHJe19TOIhBHSSIUBeIAYZ5JuYb8wb 0ABZfbqlpTPJ7dhMgUIWaaRxylm014aZ7ObmuqDvtVtK8BS1P4mF1bkPyuaLqvwfn7q0 ome5sImRg4PNujX+uUCFXT4BG/JBZ/Jo1GBgCVyHqSaEFUasju/vT/S8Sn0F1keu6NTN EnwhJwwBpl9MOJPGaNM7iwJPacjDnZWMHiPK2HYWuz6Xn9nLsi71GRXl2ENEhOnWFtXS NP9+WWIlLhO3aWzaaJO/hPMxtciMx7A8JW0/2oTJMR+X8d+tWZEs3adGr6UT8fAYVAJE 4F+g== X-Gm-Message-State: AKwxytfC4dUkDVVyDSNCrgvK8YA9bo5iOLWq23Ne1mWnLiYzv7xvBoH1 jRYtzmKIMXmacQIrrxkE5AQLoYFxvAgVswaIE5kxznTA X-Google-Smtp-Source: AH8x225L+TX+cmEbiLkzbMhmtlOCDReouJLJekqkxgapbtf2824XzYURG9nbqc4hwOAIaMbwjAffyJT3wcdLdl0BDKc= X-Received: by 10.25.229.146 with SMTP id i18mr4816007lfk.66.1516839303576; Wed, 24 Jan 2018 16:15:03 -0800 (PST) MIME-Version: 1.0 Received: by 10.25.25.13 with HTTP; Wed, 24 Jan 2018 16:15:02 -0800 (PST) In-Reply-To: <27327.1516138449@obiwan.sandelman.ca> References: <27327.1516138449@obiwan.sandelman.ca> From: Benjamin Cronce Date: Wed, 24 Jan 2018 18:15:02 -0600 Message-ID: To: Michael Richardson Cc: Arie , bloat Content-Type: multipart/alternative; boundary="001a113c592adf018c05638eabe3" Subject: Re: [Bloat] Curious bufferbloat on DOCSIS connection with many downloads 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: Thu, 25 Jan 2018 00:15:05 -0000 --001a113c592adf018c05638eabe3 Content-Type: text/plain; charset="UTF-8" Along what Michael Richardson said, with GPON I have seen where idle latency was ~1.5ms, but under load latency was about 0.2ms. I wouldn't be surprised if TDMA scheduling playing a factor. I don't know what kind of latency SLAs DOCSIS can or typically have. GPON has scheduling latency all the way down to 0.5ms. On Tue, Jan 16, 2018 at 3:34 PM, Michael Richardson wrote: > > Arie wrote: > > I'm puzzled by this result, somehow sending 300KB/s of empty packets > > upstream drastically improves the latency of my connection when it's > > receiving many downloads. > > Maybe not exactly power save, but perhaps asking for the upstream bandwidth > gets the CMTS to notice you more often and schedule a dump of it's queue of > traffic for you. > > -- > ] Never tell me the odds! | ipv6 mesh > networks [ > ] Michael Richardson, Sandelman Software Works | network > architect [ > ] mcr@sandelman.ca http://www.sandelman.ca/ | ruby on > rails [ > > > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat > > --001a113c592adf018c05638eabe3 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Along what Michael Richardson said, with GPON I have seen = where idle latency was ~1.5ms, but under load latency was about 0.2ms. I wo= uldn't be surprised if TDMA scheduling playing a factor. I don't kn= ow what kind of latency SLAs=C2=A0DOCSIS c= an or typically have. GPON has scheduling latency all the way down to 0.5ms= .

On = Tue, Jan 16, 2018 at 3:34 PM, Michael Richardson <mcr@sandelman.ca><= /span> wrote:

Arie <nospam@ariekanarie.nl= > wrote:
=C2=A0 =C2=A0 > I'm puzzled by this result, somehow sending 300KB/s = of empty packets
=C2=A0 =C2=A0 > upstream drastically improves the latency of my connecti= on when it's
=C2=A0 =C2=A0 > receiving many downloads.

Maybe not exactly power save, but perhaps asking for the upstream ba= ndwidth
gets the CMTS to notice you more often and schedule a dump of it's queu= e of
traffic for you.

--
]=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Never tell me the o= dds!=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| ipv6 me= sh networks [
]=C2=A0 =C2=A0Michael Richardson, Sandelman Software Works=C2=A0 =C2=A0 =C2= =A0 =C2=A0 | network architect=C2=A0 [
]=C2=A0 =C2=A0 =C2=A0mcr@sandelman.ca=C2=A0 http://www.sandelman.ca/=C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2= =A0ruby on rails=C2=A0 =C2=A0 [


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