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 4DF2921F35A for ; Thu, 12 Mar 2015 11:18:10 -0700 (PDT) Received: from localhost (localhost.localdomain [127.0.0.1]) by rock.ICSI.Berkeley.EDU (Postfix) with ESMTP id B2A9E2C4051 for ; Thu, 12 Mar 2015 11:18:10 -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 MzF5wjYlpmQd for ; Thu, 12 Mar 2015 11:18:10 -0700 (PDT) Received: from mail-qc0-f171.google.com (mail-qc0-f171.google.com [209.85.216.171]) (Authenticated sender: narseo) by rock.ICSI.Berkeley.EDU (Postfix) with ESMTP id 406632C4053 for ; Thu, 12 Mar 2015 11:18:10 -0700 (PDT) Received: by qcwb13 with SMTP id b13so20700449qcw.9 for ; Thu, 12 Mar 2015 11:18:09 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.55.31.94 with SMTP id f91mr36096470qkf.94.1426184289371; Thu, 12 Mar 2015 11:18:09 -0700 (PDT) Received: by 10.96.136.39 with HTTP; Thu, 12 Mar 2015 11:18:09 -0700 (PDT) In-Reply-To: References: Date: Thu, 12 Mar 2015 11:18:09 -0700 Message-ID: From: Narseo Vallina Rodriguez To: Jonathan Morton Content-Type: text/plain; charset=UTF-8 Cc: Jordan Peacock , Kartik Agaram , 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 18:18:39 -0000 Hi Jonathan > Status quo is that loading a web page with many resources on it is > unreliable. Early connections succeed and become established, the congestion > window opens, the buffer in the 3G tower begins to fill up, inducing several > seconds of latency, and subsequent DNS lookups and TCP handshakes tend to > time out. End result: often, half the images on the page are broken. > The way you're describing this specific part, sounds more to me like a control-plane latency issue (i.e., the time for the RNC to allocate a radio channel to the client by promoting it from IDLE/FACH to DCH) rather than a buffer size related issue (which is actually introduced both on the handset and the RNC/eNB to deal with the C-Plane latency) https://www.qualcomm.com/media/documents/files/qualcomm-research-latency-in-hspa-data-networks.pdf