From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-x232.google.com (mail-qg0-x232.google.com [IPv6:2607:f8b0:400d:c04::232]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id D692F21F2FA; Thu, 21 May 2015 20:41:53 -0700 (PDT) Received: by qgfa63 with SMTP id a63so3181956qgf.0; Thu, 21 May 2015 20:41:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=B1gmijlw/DeJefi5QiJc5Ds1h2yoPouB398TH4mLnxM=; b=PL54xmUrmRLnFAwLavu4A2ECixGMOFPXhJP6YGTDze0r6z5WxD117Yee1Mq+fD4qD/ YXFwcN9s4jZlHEmHFlkTcRXiMZiq2pJiWqr3hIeQ2aMfln+1Lb3JvYegiUxwrVQp8cfz B3usanuBFpE8nYy+0ljuUQqkahMVfPTCJiEaySxLdkzPLHp3iGBK/VH0pFYOREr0wDS0 ix21/fDLzczkyBFfLM3X0hZn7lCI2E8UkFxApPcxD5pVE9FYZmOqNPhXftoygx3zxeBD 5wEY73H6crUDsZseLuiINCoxejx3361qbk43p3BJ5t4fIbC4uYmT7GcydYNtDYWVHleW T0mw== MIME-Version: 1.0 X-Received: by 10.55.21.31 with SMTP id f31mr13557361qkh.95.1432266112089; Thu, 21 May 2015 20:41:52 -0700 (PDT) Received: by 10.96.187.71 with HTTP; Thu, 21 May 2015 20:41:52 -0700 (PDT) In-Reply-To: References: <3BDE8792-3B33-4DD6-B662-C18B2CECD183@gmail.com> <555DF4C9.7050207@pollere.com> <555E086E.30605@pollere.com> Date: Thu, 21 May 2015 20:41:52 -0700 Message-ID: From: Aaron Wood To: Jonathan Morton Content-Type: multipart/alternative; boundary=001a1147e74ed5c4650516a3705f Cc: cake@lists.bufferbloat.net, Justin Beech , bloat Subject: Re: [Bloat] [Cake] dslreports and inbound rate shaping X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 May 2015 03:42:23 -0000 X-List-Received-Date: Fri, 22 May 2015 03:42:23 -0000 --001a1147e74ed5c4650516a3705f Content-Type: text/plain; charset=UTF-8 But will it trigger at all? If the inbound rate is say 50Mbps, and the link to the in-home devices are over 100Mbps ethernet, will codel _ever_ see a 5ms buffer on inbound? Or is the shaping buffering incoming packets, and creating a bundle that it can measure? (I don't know the internals of how htb(?) does the limiting) -Aaron On Thu, May 21, 2015 at 9:39 AM, Jonathan Morton wrote: > No - at 90% shaping on ingress, 5/5ms will trigger when the visible queue > has built up to 5ms over a continuous 50ms. At 95%, it'll trigger at 100ms. > > Remember, Codel can't see what's in the dumb FIFO on the upstream end of > the link. By the time it triggers, there's potentially a lot of queue there > that it doesn't know about and can't directly measure. That's why it has to > be more aggressive about the queue it can see. > > - Jonathan Morton > > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat > > --001a1147e74ed5c4650516a3705f Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
But will it trigger at all?=C2=A0 If the inbound rate is s= ay 50Mbps, and the link to the in-home devices are over 100Mbps ethernet, w= ill codel _ever_ see a 5ms buffer on inbound?

Or is the = shaping buffering incoming packets, and creating a bundle that it can measu= re? =C2=A0(I don't know the internals of how htb(?) does the limiting)<= /div>

-Aaron

<= div class=3D"gmail_quote">On Thu, May 21, 2015 at 9:39 AM, Jonathan Morton = <chromatix99@gmail.com> wrote:

No - at 90% shaping on ingress, 5/5ms will trigger = when the visible queue has built up to 5ms over a continuous 50ms.=C2=A0 At= 95%, it'll trigger at 100ms.

Remember, Codel can't see what's in the dumb FIFO on= the upstream end of the link. By the time it triggers, there's potenti= ally a lot of queue there that it doesn't know about and can't dire= ctly measure. That's why it has to be more aggressive about the queue i= t can see.

- Jonathan Morton


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