From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.net.t-labs.tu-berlin.de (mail.net.t-labs.tu-berlin.de [IPv6:2001:470:96b9:4:130:149:220:252]) by huchra.bufferbloat.net (Postfix) with ESMTP id B40A621F15E for ; Wed, 28 Nov 2012 12:01:05 -0800 (PST) Received: from [192.168.178.81] (g231085229.adsl.alicedsl.de [92.231.85.229]) by mail.net.t-labs.tu-berlin.de (Postfix) with ESMTPSA id 1A52C4C2A56 for ; Wed, 28 Nov 2012 21:01:04 +0100 (CET) Message-ID: <50B66D7E.1020806@net.t-labs.tu-berlin.de> Date: Wed, 28 Nov 2012 21:01:02 +0100 From: Oliver Hohlfeld User-Agent: Mozilla/5.0 (X11; Linux i686; rv:11.0) Gecko/20120411 Thunderbird/11.0.1 MIME-Version: 1.0 To: bloat@lists.bufferbloat.net References: <50B669E5.8020105@superduper.net> In-Reply-To: <50B669E5.8020105@superduper.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Bloat] [Cerowrt-devel] FQ_Codel lwn draft article review 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, 28 Nov 2012 20:01:06 -0000 On 11/28/2012 08:45 PM, Simon Barber wrote: > Not sure why you would use mean latency - for VoIP the thing that > matters is maximum latency - Latency matters, but only when assessing conversational quality, i.e., involving two parties and their turn taking behavior. Latency does not affect the quality of an unidirectional audio stream. The latter is only affected by packet loss. Note that jitter translates into packet loss at application layer by the de-jitter buffer (audio frame discards), when the packets arrive after their scheduled playout time. If they arrive before, they don't affect the call quality. > if some packets are late, then you don't hear them. To my understanding, this is generally referred to as jitter. > More precisely a small packet loss rate is OK How small is small? What is tolerable depends on other parameters such as the used code, whether packet loss concealment is turned on etc. --Oliver