Re: [rtcweb] Pictures of congestion control on the Internet - which is more realistic?

Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com> Fri, 25 April 2014 11:54 UTC

Return-Path: <sergio.garcia.murillo@gmail.com>
X-Original-To: rtcweb@ietfa.amsl.com
Delivered-To: rtcweb@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B0D8C1A047E for <rtcweb@ietfa.amsl.com>; Fri, 25 Apr 2014 04:54:31 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.999
X-Spam-Level:
X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=ham
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mv0qUBh8OFFL for <rtcweb@ietfa.amsl.com>; Fri, 25 Apr 2014 04:54:30 -0700 (PDT)
Received: from mail-wg0-x229.google.com (mail-wg0-x229.google.com [IPv6:2a00:1450:400c:c00::229]) by ietfa.amsl.com (Postfix) with ESMTP id 003951A0435 for <rtcweb@ietf.org>; Fri, 25 Apr 2014 04:54:29 -0700 (PDT)
Received: by mail-wg0-f41.google.com with SMTP id y10so825261wgg.24 for <rtcweb@ietf.org>; Fri, 25 Apr 2014 04:54:23 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type; bh=qXf7DeFRJ6yXkvUUPTgDeVgx/VOim17GRf88ZQA2dP8=; b=j1W+w1AOlSG1FsuztXGZX6gt0tvRG2zWJ45hquz6nP+Zwhp6agv3EpLe/6P0LL373W BhpLGsxU2o6viilh0o8+EpFTMX3IKYH6xk49lpQYX9gzGa7rMeDmnWCnlYq9TIOJl07T Lc49v88tFs0+KHT1YBo1cC24CDncS4ueGdLcTu5tYQO8y2+hmhgQ9y7wGqWuMTzaqh11 KSdIAtUdnvAFz00T2RPA8R+nua88Z6xrCX1T2tVD0btCbvvVl8Gyt6Umzq0zFKAwr+WU gPp+qzgg0Wjuz66YLzBn7r7KIfhlDjju1PIMYHkRyIzK3Y6JzWYhtnefm6sPmFOCu6Aq p6Nw==
X-Received: by 10.180.97.41 with SMTP id dx9mr3444924wib.28.1398426862908; Fri, 25 Apr 2014 04:54:22 -0700 (PDT)
Received: from [192.168.1.33] (61.Red-88-9-161.dynamicIP.rima-tde.net. [88.9.161.61]) by mx.google.com with ESMTPSA id cv4sm10832667wjc.34.2014.04.25.04.54.21 for <rtcweb@ietf.org> (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 25 Apr 2014 04:54:21 -0700 (PDT)
Message-ID: <535A4CEF.7040904@gmail.com>
Date: Fri, 25 Apr 2014 13:54:23 +0200
From: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0
MIME-Version: 1.0
To: rtcweb@ietf.org
References: <5357B281.1030900@alvestrand.no> <CAD5OKxvpse7_aCTMNvvt6_LBMXMyXKWoSpOUnmXMTv-O0u8Kug@mail.gmail.com> <CF7D2A6D.464A8%stewe@stewe.org>
In-Reply-To: <CF7D2A6D.464A8%stewe@stewe.org>
Content-Type: multipart/alternative; boundary="------------070304070203000802070708"
Archived-At: http://mailarchive.ietf.org/arch/msg/rtcweb/KJIbNpoEM-yM_m5iHZo5VXrXh9w
Subject: Re: [rtcweb] Pictures of congestion control on the Internet - which is more realistic?
X-BeenThere: rtcweb@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: Real-Time Communication in WEB-browsers working group list <rtcweb.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/rtcweb>, <mailto:rtcweb-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/rtcweb/>
List-Post: <mailto:rtcweb@ietf.org>
List-Help: <mailto:rtcweb-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/rtcweb>, <mailto:rtcweb-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 25 Apr 2014 11:54:31 -0000

El 23/04/2014 17:46, Stephan Wenger escribió:
> In both cases, the typical reaction of an endpoint is to expose the 
> user to crappy quality, until the user hangs up.  Sometimes, slightly 
> smarter implementations hang up themselves if the packet loss rate 
> becomes excessive.I would suggest not to paint a rosier picture in the 
> draft than what is warranted based on real-world observations.
>
>     Based on this, most UDP endpoints do not deal well with
>     congestion. Ideally this should change to support better bandwidth
>     management. Futhermore, reliably transmitting real time media over
>     public internet would also require changes to biffer management
>     algorithms in routers, which will, in turn, affect congestion
>     handling strategies in the end points.
>

+1, but also from my real life experience, the most problems I am having 
with quality are related to bad Wifi coverage or cheap/crappy XDSL 
routers/cable modems. Almost 100% of problems with quality I had found 
were solved just by plugging the ethernet cable.

Best regards
Sergio