From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vc0-x231.google.com (mail-vc0-x231.google.com [IPv6:2607:f8b0:400c:c03::231]) (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 B7B3821F35E for ; Thu, 12 Mar 2015 12:42:46 -0700 (PDT) Received: by mail-vc0-f177.google.com with SMTP id id10so6213774vcb.8 for ; Thu, 12 Mar 2015 12:42:45 -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=h+V82W2VNNWZXupCVAuv9X5E5KxrjWx1kscH9mm4DPQ=; b=oza3NiYy79aiftFVWQhXQdH5NN/t70sVbRvG8AMSk6ty5Y+rdM02di8kUu9uEuJ7zv Br2VLBLh9hHRmiT3Sbw1gWo1lTJw66OsbDjsTai+yoPu+hsmuE1v9TvxnRvunZbO3yCu laS3326luIHdcrizHasM4p2YtxJrPhS1978B24qPLYiGzbPr/afW8LlGssOxcoyhGFne 9bnTGkyKAv/Ulv1NRKiXFkOZLVcjltKIttwtPf1dpQGRFmgTy8hLjz54fXpPzDzlmOKh xb7LtOWfSEY7pks6EWCogTxJRdCgrhEbCztetEWux3p3dmae67CBHXSz0FBVZEloAgF6 ahPg== MIME-Version: 1.0 X-Received: by 10.52.3.74 with SMTP id a10mr1378505vda.95.1426189365453; Thu, 12 Mar 2015 12:42:45 -0700 (PDT) Received: by 10.52.92.65 with HTTP; Thu, 12 Mar 2015 12:42:45 -0700 (PDT) Received: by 10.52.92.65 with HTTP; Thu, 12 Mar 2015 12:42:45 -0700 (PDT) In-Reply-To: References: Date: Thu, 12 Mar 2015 21:42:45 +0200 Message-ID: From: Jonathan Morton To: Narseo Vallina Rodriguez Content-Type: multipart/alternative; boundary=20cf3033477f82ab9905111c966e 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 19:43:15 -0000 --20cf3033477f82ab9905111c966e Content-Type: text/plain; charset=UTF-8 I have sometimes noticed that the first packet after an idle period gets additional latency on 3G. It's not much, maybe a quarter second. I'm not worried about that, and it doesn't really cause any problems for me. I expect that's the C-plane latency you're on about. I was talking specifically about what happens when traffic is already flowing - NOT idle - and then an additional, concurrent flow wants to start up. If it goes to a different server, it's likely to start with a DNS lookup, and resolvers tend to have remarkably short timeouts these days. A few seconds induced latency, due to plain old bufferbloat, is enough to make it fail. - Jonathan Morton --20cf3033477f82ab9905111c966e Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

I have sometimes noticed that the first packet after an idle= period gets additional latency on 3G. It's not much, maybe a quarter s= econd. I'm not worried about that, and it doesn't really cause any = problems for me. I expect that's the C-plane latency you're on abou= t.

I was talking specifically about what happens when traffic i= s already flowing - NOT idle - and then an additional, concurrent flow want= s to start up. If it goes to a different server, it's likely to start w= ith a DNS lookup, and resolvers tend to have remarkably short timeouts thes= e days. A few seconds induced latency, due to plain old bufferbloat, is eno= ugh to make it fail.

- Jonathan Morton

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