IETF Logo Mail Archive

Re: Overhead of HTTP/2 Stream Management.

"Walter H." <walter.h@mathemainzel.info> Wed, 08 April 2015 07:55 UTC

Return-Path: <ietf-http-wg-request+bounce-httpbisa-archive-bis2juki=lists.ie@listhub.w3.org>
X-Original-To: ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com
Delivered-To: ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C02FD1B2D79 for <ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com>; Wed, 8 Apr 2015 00:55:57 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -3.303
X-Spam-Level:
X-Spam-Status: No, score=-3.303 tagged_above=-999 required=5 tests=[BAYES_05=-0.5, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FORGED_MUA_MOZILLA=2.309, RCVD_IN_DNSWL_HI=-5, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] 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 PLZEPCJiFJaG for <ietfarch-httpbisa-archive-bis2Juki@ietfa.amsl.com>; Wed, 8 Apr 2015 00:55:56 -0700 (PDT)
Received: from frink.w3.org (frink.w3.org [128.30.52.56]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DF2421B2D75 for <httpbisa-archive-bis2Juki@lists.ietf.org>; Wed, 8 Apr 2015 00:55:55 -0700 (PDT)
Received: from lists by frink.w3.org with local (Exim 4.80) (envelope-from <ietf-http-wg-request@listhub.w3.org>) id 1YfknS-00079f-OU for ietf-http-wg-dist@listhub.w3.org; Wed, 08 Apr 2015 07:53:14 +0000
Resent-Date: Wed, 08 Apr 2015 07:53:14 +0000
Resent-Message-Id: <E1YfknS-00079f-OU@frink.w3.org>
Received: from lisa.w3.org ([128.30.52.41]) by frink.w3.org with esmtp (Exim 4.80) (envelope-from <walter.h@mathemainzel.info>) id 1YfknP-000727-BU for ietf-http-wg@listhub.w3.org; Wed, 08 Apr 2015 07:53:11 +0000
Received: from mx05lb.world4you.com ([81.19.149.115]) by lisa.w3.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from <walter.h@mathemainzel.info>) id 1YfknN-0001NO-W0 for ietf-http-wg@w3.org; Wed, 08 Apr 2015 07:53:11 +0000
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mathemainzel.info; s=dkim11; h=Content-Transfer-Encoding:Content-Type:MIME-Version:To:From:Subject:Date:References:In-Reply-To:Message-ID; bh=50hrWs7hLxt9NTJHeqVzi8abryXoPfIwGcgria+kbss=; b=XbZJp3plyy7PWJy6fhlnkgRnT4VHgBcCjuYmId4JXi3pLYSMURgIRRphVwa5fU/mJxsB4kVh20b5QF5ZVCBqjgtu8Cqw3hswiYFTAlo6K8KNn/rwS/b3dyVa3IaQQrNl0lH0VEZ5o2+ChKoqzu1z9z3epF8qFTlrtcY7fUtg4d8=;
Received: from [90.146.128.86] (helo=outgoing.router) by mx05lb.world4you.com with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from <walter.h@mathemainzel.info>) id 1Yfkmw-0000UY-MM for ietf-http-wg@w3.org; Wed, 08 Apr 2015 09:52:43 +0200
Received: <hidden>
Received: <hidden>
Received: <hidden>
Message-ID: <b755c1ca5ecb9b919e0fb9c6b92e4f3e.1428479562@squirrel.mail>
In-Reply-To: <20150406001616.GC16399@1wt.eu>
References: <CABb0SYTLVFYXymJ75TkNkku3oT5pRcSAahjq2HcD5gDLouskpA@mail.gmail.com> <20150405183651.GA11551@1wt.eu> <CABb0SYTSW+M1NjBAa_s7dcB56obj1nEbQmt5r6P7eStTBmTwHg@mail.gmail.com> <20150405185755.GD8875@1wt.eu> <CABb0SYR0wV1U5i2n=PbZd+BFTBntJFvzFD0DPPRVHXyJP=Oyqg@mail.gmail.com> <20150405234911.GA16399@1wt.eu> <CABb0SYRkaX_FJGv4n9_hg+1UYydao0sOCU13WsVFEdPdjkMfiQ@mail.gmail.com> <20150406001616.GC16399@1wt.eu>
Date: Wed, 08 Apr 2015 09:52:42 +0200
From: "Walter H." <walter.h@mathemainzel.info>
To: ietf-http-wg@w3.org
X-Mailer: Mozilla/5.0 (UNIX; U; Cray X-MP/48; en-US; rv:2.70) Gecko/20110929 Communicator/7.20
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
X-Priority: 3 (Normal)
Importance: Normal
Content-Transfer-Encoding: quoted-printable
X-SA-Do-Not-Run: Yes
X-AV-Do-Run: Yes
X-SA-Exim-Connect-IP: 90.146.128.86
X-SA-Exim-Mail-From: walter.h@mathemainzel.info
X-SA-Exim-Scanned: No (on mx05lb.world4you.com); SAEximRunCond expanded to false
Received-SPF: pass client-ip=81.19.149.115; envelope-from=walter.h@mathemainzel.info; helo=mx05lb.world4you.com
X-W3C-Hub-Spam-Status: No, score=-1.9
X-W3C-Hub-Spam-Report: AWL=-4.436, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FORGED_MUA_MOZILLA=1.596, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, W3C_NW=1
X-W3C-Scan-Sig: lisa.w3.org 1YfknN-0001NO-W0 d62f75679b29d85b2f4bb4add5e24fcb
X-Original-To: ietf-http-wg@w3.org
Subject: Re: Overhead of HTTP/2 Stream Management.
Archived-At: <http://www.w3.org/mid/b755c1ca5ecb9b919e0fb9c6b92e4f3e.1428479562@squirrel.mail>
Resent-From: ietf-http-wg@w3.org
X-Mailing-List: <ietf-http-wg@w3.org> archive/latest/29292
X-Loop: ietf-http-wg@w3.org
Resent-Sender: ietf-http-wg-request@w3.org
Precedence: list
List-Id: <ietf-http-wg.w3.org>
List-Help: <http://www.w3.org/Mail/>
List-Post: <mailto:ietf-http-wg@w3.org>
List-Unsubscribe: <mailto:ietf-http-wg-request@w3.org?subject=unsubscribe>

On Mon, April 6, 2015 02:16, Willy Tarreau wrote:

> H2 supports multiple streams over the same TCP connection to limit the
> buffer bloat issue, to reduce the connection counts, and to try to
> conserve the TCP congestion windows. And it supports these streams
> in *parallel*, yours are serialized.

with the side effect or disadvantage in comparison to HTTP/1.x, that two
separate TCP connection need not be neccessarily routed identical;

now think of a problem, that one of the two TCP connections gets closed;
the other one remains open and only one download gets broken;
in case of HTTP/2 this would be with all transmissions within the same TCP
transmission -> single-point-of-failure;

by the way, the samples were with HTTP/1.x and HTTP/2

v2.27.8 | Report a Bug | By Email | System Status