From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vn0-x22c.google.com (mail-vn0-x22c.google.com [IPv6:2607:f8b0:400c:c0f::22c]) (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 78E85202102 for ; Wed, 6 May 2015 13:25:55 -0700 (PDT) Received: by vnbf62 with SMTP id f62so1601812vnb.13 for ; Wed, 06 May 2015 13:25:51 -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=hs0iMNbsB4YQd4RLx4LqEmQcn2WdQeh/Q3sGYNqMqqY=; b=GjyyWkJqGchJyVazN0EIwgs8kttXFog9AcLXBFdQLEnmIcofsmII0RC3Bv6vk0rEn5 426iAbfS2z90ruPxbBamkQOmZprpzmu0eARPB0PYsyZQMC68hzGFLeneQSfS9CSeEeQe 5yWWMK/KScTj3zr2AKXJO6VMvEoNrG97ZefHg66AEbJwV5ifG6RsITapAmPO3kYfx+YQ uAdywjsqU7IkUJvI9NsYp7JP3KHs47IBbque366GhsuWag5YhEAHBT1L2BnVQjHmqGYt 7s/ngwZIS3Bn2e81RazdhCCfDlyxIDj6/MqSOpKRUF0TBEF1jJYhcs945ahuc4YsIiRn 6wlw== MIME-Version: 1.0 X-Received: by 10.52.162.105 with SMTP id xz9mr392013vdb.95.1430943951374; Wed, 06 May 2015 13:25:51 -0700 (PDT) Received: by 10.52.12.167 with HTTP; Wed, 6 May 2015 13:25:51 -0700 (PDT) Received: by 10.52.12.167 with HTTP; Wed, 6 May 2015 13:25:51 -0700 (PDT) In-Reply-To: References: <25065_1429716388_5537BDA4_25065_2328_1_63pyislbvtjf653k3qt8gw2c.1429715929544@email.android.com> <1429717468.18561.90.camel@edumazet-glaptop2.roam.corp.google.com> <5537CDB7.60301@orange.com> <1429722979.18561.112.camel@edumazet-glaptop2.roam.corp.google.com> <5537DA20.1090008@orange.com> <5537DE4D.8090100@orange.com> <553882D7.4020301@orange.com> <1429771718.22254.32.camel@edumazet-glaptop2.roam.corp.google.com> <6C0D04CF-53AA-4D18-A4E4-B746AF6487C7@gmx.de> <87wq123p5r.fsf@toke.dk> <2288B614-B415-4017-A842-76E8F5DFDE4C@gmx.de> <553B06CE.1050209@superduper.net> <14ceed3c818.27f7.e972a4f4d859b00521b2b659602cb2f9@superduper.net> <0C930D43-A05B-48E2-BC01-792CAA72CAD1@gmx.de> <5549A1B8.50005@superduper.net> Date: Wed, 6 May 2015 23:25:51 +0300 Message-ID: From: Jonathan Morton To: Jim Gettys Content-Type: multipart/alternative; boundary=089e016284caea50d805156f993c Cc: bloat Subject: Re: [Bloat] DSLReports Speed Test has latency measurement built-in 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, 06 May 2015 20:26:24 -0000 --089e016284caea50d805156f993c Content-Type: text/plain; charset=UTF-8 So, as a proposed methodology, how does this sound: Determine a reasonable ballpark figure for typical codec and jitter-buffer delay (one way). Fix this as a constant value for the benchmark. Measure the baseline network delays (round trip) to various reference points worldwide. Measure the maximum induced delays in each direction. For each reference point, sum two sets of constant delays, the baseline network delay, and both directions' induced delays. Compare these totals to twice the ITU benchmark figures, rate accordingly, and plot on a map. - Jonathan Morton --089e016284caea50d805156f993c Content-Type: text/html; charset=UTF-8

So, as a proposed methodology, how does this sound:

Determine a reasonable ballpark figure for typical codec and jitter-buffer delay (one way). Fix this as a constant value for the benchmark.

Measure the baseline network delays (round trip) to various reference points worldwide.

Measure the maximum induced delays in each direction.

For each reference point, sum two sets of constant delays, the baseline network delay, and both directions' induced delays.

Compare these totals to twice the ITU benchmark figures, rate accordingly, and plot on a map.

- Jonathan Morton

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