From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.perfora.net (mout.perfora.net [74.208.4.194]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mout.perfora.net", Issuer "Thawte SSL CA" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 8A3E621F72B for ; Fri, 29 Aug 2014 07:21:47 -0700 (PDT) Received: from J4 (c-68-50-226-187.hsd1.md.comcast.net [68.50.226.187]) by mrelay.perfora.net (node=mreueus001) with ESMTP (Nemesis) id 0MeAhM-1XnIIS445u-00PyHy; Fri, 29 Aug 2014 16:21:45 +0200 From: "Jerry Jongerius" To: "'Jonathan Morton'" References: <000001cfbefe$69194c70$3b4be550$@duckware.com> <000901cfc2c2$c21ae460$4650ad20$@duckware.com> <4A89264B-36C5-4D1F-9E5E-33F2B42C364E@gmail.com> <002201cfc2e4$565c1100$03143300$@duckware.com> In-Reply-To: Date: Fri, 29 Aug 2014 10:21:47 -0400 Message-ID: <001e01cfc394$93ca5280$bb5ef780$@duckware.com> MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_001F_01CFC373.0CB975D0" X-Mailer: Microsoft Outlook 14.0 Content-Language: en-us Thread-Index: AQFFVy+FAO2HJAXNGbNNrLY/R/b/6gGg5QYjATtzUJsCM/8plgJDZN5dAwhNtMwCUyYrSZyW/8HA X-Provags-ID: V02:K0:3lCQfXg5h3rRWJQMHIqGXLeM91iUlZBVrmRxxT1YWZ0 233hQAmKLfaNC3oUM9V2DxWxWMCw9v6HdUxhjdpbAiRVEHeCL4 4GcpvJza7DFt4mN9MdvvuAQDE9dx9kNJgy8dQdnbDa1c38T0Oc /aCMYUMK6oWytxpt3lQagmU7covgW/whr0DvIX0x1t7/+eexKD G/Prn6Y9QrjekTJTU0azQMWQ3FwhyvD05IXAOrr+ZTR7Ih9sO3 e0e4A5sbQlczvBBOBVSWI1+UKsRHrpgG75ZLNwbA/Yzpeqe09b ETQJu+GnhAk+XR0WeABT5V1a7YxXQ3HPAlDZnBUL3RRPsWMEIe yGUrsLJX/mCgmcgmHULSorQI1YYKiCeoel1lIMVTz X-UI-Out-Filterresults: notjunk:1; Cc: bloat@lists.bufferbloat.net 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: Fri, 29 Aug 2014 14:21:48 -0000 This is a multipart message in MIME format. ------=_NextPart_000_001F_01CFC373.0CB975D0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0020_01CFC373.0CB975D0" ------=_NextPart_001_0020_01CFC373.0CB975D0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable A =E2=80=98boost=E2=80=99 has never been seen. Bandwidth graphs where = there is no packet loss look like: =20 =20 =20 From: Jonathan Morton [mailto:chromatix99@gmail.com]=20 Sent: Thursday, August 28, 2014 2:15 PM To: Jerry Jongerius Cc: bloat Subject: RE: [Bloat] The Dark Problem with AQM in the Internet? =20 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 ------=_NextPart_001_0020_01CFC373.0CB975D0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

A =E2=80=98boost=E2=80=99 has never been seen.=C2=A0 Bandwidth graphs = where there is no packet loss look like:

 

 

 

From:= = Jonathan Morton [mailto:chromatix99@gmail.com]
Sent: = Thursday, August 28, 2014 2:15 PM
To: Jerry = Jongerius
Cc: bloat
Subject: RE: [Bloat] The Dark = Problem with AQM in the Internet?

 

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

I note from http://www.dslreports.com/fa= q/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

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