From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from rock.ICSI.Berkeley.EDU (rock.ICSI.Berkeley.EDU [192.150.186.19]) by huchra.bufferbloat.net (Postfix) with ESMTP id 07E9721F362 for ; Thu, 12 Mar 2015 12:28:13 -0700 (PDT) Received: from localhost (localhost.localdomain [127.0.0.1]) by rock.ICSI.Berkeley.EDU (Postfix) with ESMTP id 55CFB2C4058 for ; Thu, 12 Mar 2015 12:28:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at ICSI.Berkeley.EDU Received: from rock.ICSI.Berkeley.EDU ([127.0.0.1]) by localhost (maihub.ICSI.Berkeley.EDU [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 09e37UmTKqbD for ; Thu, 12 Mar 2015 12:28:13 -0700 (PDT) Received: from mail-qc0-f177.google.com (mail-qc0-f177.google.com [209.85.216.177]) (Authenticated sender: narseo) by rock.ICSI.Berkeley.EDU (Postfix) with ESMTP id D5ACD2C4055 for ; Thu, 12 Mar 2015 12:28:12 -0700 (PDT) Received: by qcwr17 with SMTP id r17so21190605qcw.11 for ; Thu, 12 Mar 2015 12:28:12 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.140.150.131 with SMTP id 125mr58614532qhw.55.1426188492151; Thu, 12 Mar 2015 12:28:12 -0700 (PDT) Received: by 10.96.136.39 with HTTP; Thu, 12 Mar 2015 12:28:11 -0700 (PDT) In-Reply-To: References: Date: Thu, 12 Mar 2015 12:28:11 -0700 Message-ID: From: Narseo Vallina Rodriguez To: Jonathan Morton Content-Type: text/plain; charset=UTF-8 Cc: Kartik Agaram , Jordan Peacock , bloat Subject: Re: [Bloat] http/2 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: Thu, 12 Mar 2015 19:28:42 -0000 > Tell me: does a Nokia E70 support fast dormancy? And how does a less than 2 > second setup latency translate into a 45 seconds latency under continuous > load with continuous, smooth packet delivery? Which evaporates to half a > second if I clamp the TCP receive window down to a sane value? > Well, I'm not saying that you're not right. I'm just saying that there are many more dynamics that you cannot control at the control-plane as they are transparent to the handset. In the particular case you're describing, it's very likely a buffer issue but it could be also a network issue as you could be connected through an old APN (gateway). The E70 does not have fast dormancy, and it does not support HSPA. It's a basic UMTS phone from 2005 which is not very representative as of today. The latency you're describing could be caused by signaling overload or poor radio conditions but also very likely by buffers as you pointed. Are there any other buffers on the RIL interface of the handset? How do they behave? I know some operators use leaky bucket. In any case, I was referring to a general scenario and as you framed it initially "first packet", DNS, etc, it sounded as a control-plane case. That's why I said in the previous email that I was not sure if we're on the same page.