From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vc0-x232.google.com (mail-vc0-x232.google.com [IPv6:2607:f8b0:400c:c03::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 CEDEE21F738 for ; Thu, 28 Aug 2014 11:15:17 -0700 (PDT) Received: by mail-vc0-f178.google.com with SMTP id la4so1268544vcb.23 for ; Thu, 28 Aug 2014 11:15:16 -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=+JbpZ4UWt2sEq2IYVCdFM5eYnpn/6LWxxP/XnkKloOM=; b=aCy1T8e476lThKEJfIMlmoaQYU4jjP1mf15MPVMtHCWWxfZLLdHT9tOAWjvjly+ZeY y5dupaXfjkvdKlQoI+Ldij6GWkL6IuMW4DAHiVTkzqUJxcCIEZxytVdnmDT9eZitOdnf N+MFe1LXclxRiDntID+B3ilZKvMadyUvAhfoYre6UG5cO1Jb6qITz/gn2ZuNQoXx4nPz 4IdbZahin9fSHJcj9M0RiFvf008pcnlMwqwgZ/iDKA9y1rJzIBw7911mIluS0OBeEvO6 3kTyu6j59gTRmPSvUJyb0xflvYG6VTUx/qrioQX7Iav+Kgr2kmImHb2mFGs/S0kpR4cq d1tg== MIME-Version: 1.0 X-Received: by 10.220.189.3 with SMTP id dc3mr2725517vcb.64.1409249716625; Thu, 28 Aug 2014 11:15:16 -0700 (PDT) Received: by 10.53.8.39 with HTTP; Thu, 28 Aug 2014 11:15:16 -0700 (PDT) Received: by 10.53.8.39 with HTTP; Thu, 28 Aug 2014 11:15:16 -0700 (PDT) In-Reply-To: <002201cfc2e4$565c1100$03143300$@duckware.com> References: <000001cfbefe$69194c70$3b4be550$@duckware.com> <000901cfc2c2$c21ae460$4650ad20$@duckware.com> <4A89264B-36C5-4D1F-9E5E-33F2B42C364E@gmail.com> <002201cfc2e4$565c1100$03143300$@duckware.com> Date: Thu, 28 Aug 2014 21:15:16 +0300 Message-ID: From: Jonathan Morton To: Jerry Jongerius Content-Type: multipart/alternative; boundary=089e0158ad9cc267da0501b484dc Cc: bloat Subject: Re: [Bloat] The Dark Problem with AQM in the Internet? 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: Thu, 28 Aug 2014 18:15:18 -0000 --089e0158ad9cc267da0501b484dc Content-Type: text/plain; charset=UTF-8 If it is genuinely a single packet, then I have an alternate theory. I note from http://www.dslreports.com/faq/14520 that PowerBoost works on the first 20MB of a download. At 100Mbps or so, that's about 2 seconds. So that's quite convincing evidence that your packet loss is happening at the moment PowerBoost switches off. It might be that the switching process takes long enough to drop one packet. Or it might be that Comcast deliberately drop one packet in order to signal the change in bandwidth to the sender. Clever, if mildly distasteful. - Jonathan Morton --089e0158ad9cc267da0501b484dc Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

If it is genuinely a single packet, then I have an alternate= theory.

I note from = http://www.dslreports.com/faq/14520 that PowerBoost works on the first = 20MB of a download.=C2=A0 At 100Mbps or so, that's about 2 seconds.=C2= =A0 So that's quite convincing evidence that your packet loss is happen= ing at the moment PowerBoost switches off.

It might be that the switching process takes long enough to = drop one packet. Or it might be that Comcast deliberately drop one packet i= n order to signal the change in bandwidth to the sender. Clever, if mildly = distasteful.

- Jonathan Morton

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