From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sesse@samfundet.no>
Received: from cassarossa.samfundet.no (cassarossa.samfundet.no
	[129.241.93.19]) (using TLSv1 with cipher AES256-SHA (256/256 bits))
	(Client did not present a certificate)
	by huchra.bufferbloat.net (Postfix) with ESMTPS id 9578D208AC5
	for <bloat@lists.bufferbloat.net>; Wed,  9 May 2012 17:08:57 -0700 (PDT)
Received: from pannekake.samfundet.no ([2001:700:300:1800::dddd])
	by cassarossa.samfundet.no with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32)
	(Exim 4.72) (envelope-from <sesse@samfundet.no>) id 1SSGwB-0001Hl-2V
	for bloat@lists.bufferbloat.net; Thu, 10 May 2012 02:08:55 +0200
Received: from sesse by pannekake.samfundet.no with local (Exim 4.72)
	(envelope-from <sesse@samfundet.no>) id 1SSGwA-0008JF-O9
	for bloat@lists.bufferbloat.net; Thu, 10 May 2012 02:08:54 +0200
Date: Thu, 10 May 2012 02:08:54 +0200
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
To: bloat@lists.bufferbloat.net
Message-ID: <20120510000854.GB8131@uio.no>
References: <CAA93jw7EUSf-NAg9q6oxRms5LQopO-VseYUtXAyCkUi=Yitx-g@mail.gmail.com>
	<4FA9FDC0.9010600@superduper.net>
	<44673AC5-4320-4C19-9788-87A63C47549D@cisco.com>
	<4FAAE5F0.2030404@freedesktop.org>
	<1336607919.12504.119.camel@edumazet-glaptop>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <1336607919.12504.119.camel@edumazet-glaptop>
X-Operating-System: Linux 3.3.4 on a x86_64
User-Agent: Mutt/1.5.20 (2009-06-14)
Subject: Re: [Bloat] [Codel]  The challenge
X-BeenThere: bloat@lists.bufferbloat.net
X-Mailman-Version: 2.1.13
Precedence: list
List-Id: General list for discussing Bufferbloat <bloat.lists.bufferbloat.net>
List-Unsubscribe: <https://lists.bufferbloat.net/options/bloat>,
	<mailto:bloat-request@lists.bufferbloat.net?subject=unsubscribe>
List-Archive: <https://lists.bufferbloat.net/pipermail/bloat>
List-Post: <mailto:bloat@lists.bufferbloat.net>
List-Help: <mailto:bloat-request@lists.bufferbloat.net?subject=help>
List-Subscribe: <https://lists.bufferbloat.net/listinfo/bloat>,
	<mailto:bloat-request@lists.bufferbloat.net?subject=subscribe>
X-List-Received-Date: Thu, 10 May 2012 00:08:58 -0000

On Thu, May 10, 2012 at 01:58:39AM +0200, Eric Dumazet wrote:
> One solution is at the producer level (TCP stack of the sender in this
> case) to properly pace the transmits in MSS units given the RTT and
> cwnd, supposedly done with TCP Hybla.

FWIW, I gave Hybla a quick test (echo hybla > /proc/sys/net/ipv4/tcp_congestion_control
and then start a VLC server; Linux 3.3.4 on both sides), and it doesn't pace
for me. It happily sends packets at what appears to be line speed, even to a
host ~100ms away on a much slower line.

/* Steinar */
-- 
Homepage: http://www.sesse.net/