From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-x22b.google.com (mail-oi0-x22b.google.com [IPv6:2607:f8b0:4003:c06::22b]) (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 64F4E21F512 for ; Wed, 8 Jul 2015 09:32:21 -0700 (PDT) Received: by oibp128 with SMTP id p128so8600292oib.3 for ; Wed, 08 Jul 2015 09:32:21 -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:content-transfer-encoding; bh=B7ra3HKnrRwR9184fw4p4U/6wx7Dhbsm3T4v9q3uxuE=; b=YPrdVxnKuA2E15Up/k2QzDHhLnUnVxrd6ECw3uIMBhLtlV8aSnPpmkNPJ91jeBxpZ0 CplvzrYWWmBBLy+8gnAcmMV7SNHf4UsVbFv9YCItKNACHPCpdnlLK05vqml+MyeYAHX3 zl5LrKw2treYFG3dlJhdIMrOXjK9XJwa0n36h/uvYU5y3+yLzebySM+KXp9a/vcrTJuI ue9IQ8l5DUxcUpOS2FyIW9x7nm3LPy0hKTclenXCW2Cbha3M93QoQwHf4rmYZy0oQEia rDMg6U+eOwoSr69AW7tFwOkjG8MwIgBYXlmGCLjg2tMrZBbHo/+lK4trffoo+iYhKXr6 fRbw== MIME-Version: 1.0 X-Received: by 10.60.178.33 with SMTP id cv1mr10409810oec.11.1436373140984; Wed, 08 Jul 2015 09:32:20 -0700 (PDT) Received: by 10.202.107.9 with HTTP; Wed, 8 Jul 2015 09:32:20 -0700 (PDT) In-Reply-To: <559D4BCA.5040907@gmail.com> References: <20150708102317.A8994406057@ip-64-139-1-69.sjc.megapath.net> <559D4BCA.5040907@gmail.com> Date: Wed, 8 Jul 2015 09:32:20 -0700 Message-ID: From: Dave Taht To: Jan Ceuleers Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: bloat Subject: Re: [Bloat] Graph of bloat 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: Wed, 08 Jul 2015 16:32:50 -0000 On Wed, Jul 8, 2015 at 9:11 AM, Jan Ceuleers wrote= : > On 08/07/15 17:55, Dave Taht wrote: >> That is a very interesting graph! Does ntp adjust system time backward >> based on getting nearly all it's samples with well over a 1/2 second >> of induced delay? > > If there is a consistent asymmetrical delay then yes. > > If the delay asymmetry is not persistent (but only occurs during up or > downloads) then the so-called huff-n-puff filter can be used to factor > it out. > > https://www.eecis.udel.edu/~mills/ntp/html/huffpuff.html Judging from that graphic... I don't think huff and puff was designed for the bufferbloated era! so the question remains, in hal's tests, did ntp adjust the clock backwards? > Jan > > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat --=20 Dave T=C3=A4ht worldwide bufferbloat report: http://www.dslreports.com/speedtest/results/bufferbloat And: What will it take to vastly improve wifi for everyone? https://plus.google.com/u/0/explore/makewififast