From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lpp01m010-f43.google.com (mail-lpp01m010-f43.google.com [209.85.215.43]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id BD059201AF7 for ; Wed, 9 May 2012 13:41:06 -0700 (PDT) Received: by lagr15 with SMTP id r15so1257226lag.16 for ; Wed, 09 May 2012 13:41:04 -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:content-transfer-encoding; bh=lUBbN3Okvg5+LcLrMwXI49kc6poEUvLZB89ZvdlebaU=; b=JlAK2YB2+a7PrMkk1BY6tzZ/zjwRa9NR+b7nTa1qCLcWI9mCTb3ot8HtRUl2yjADkH OC/3j+EctBNfuotbK/9q9qxMhQzZqq91OdEQ01u6fqDVjc4k58FX1W3jHri2rRgKOJlE QIoEeigAhmdVlHHNA4DlSd5cs5IcohbsoYWV96qUVg+8TcFIVt4r+sM3aNtAhrjLzO89 QtsWrstqsPNsqRkGuoI8oN8dhdfd2JsD8wTo/nmqdx2jM31N8JUGnCbj1atmNfABjb2w EkI5UXsB0s2qms2JEqoMogQo16H+JL4M+UGS+oxEvHVOK3i8UhSojmUKt7C4RbLDyLnQ xLWg== MIME-Version: 1.0 Received: by 10.152.114.106 with SMTP id jf10mr1568403lab.16.1336596064436; Wed, 09 May 2012 13:41:04 -0700 (PDT) Received: by 10.112.132.98 with HTTP; Wed, 9 May 2012 13:41:04 -0700 (PDT) In-Reply-To: <4FAAD534.2030100@superduper.net> References: <4FAAD534.2030100@superduper.net> Date: Wed, 9 May 2012 13:41:04 -0700 Message-ID: From: Dave Taht To: Simon Barber Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: codel@lists.bufferbloat.net Subject: Re: [Codel] Worst case conditions - large RTT X-BeenThere: codel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: CoDel AQM discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 May 2012 20:41:07 -0000 On Wed, May 9, 2012 at 1:36 PM, Simon Barber wrote: > Codel assesses the minimum delay over a fixed time period (the interval) = - > what happens when the interval is much smaller that the RTT. For example = a > tcp stream is experiencing a 2 second RTT (perhaps due to bufferbloat at > some point), yet the interval is 100ms. The TCP implementation is a poor = one > that will ACK a window at a time. Here codel will drop excessively, and > cause low throughput? > You are doing a great job of asking good questions. I would hope we could get some more people lined up to answer them, armed with sims and real hardware. Volunteers for each problem would be helpful. Me, I'd like very much to get some data back on the variable bandwidth wireless scenario! Except that cerowrt's too broken at the moment to use and I'm trying to fix that. The latest netem does ECN, btw. And ns3 has a decent minstrel model. (hint, hint) > Simon > _______________________________________________ > Codel mailing list > Codel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/codel --=20 Dave T=E4ht SKYPE: davetaht US Tel: 1-239-829-5608 http://www.bufferbloat.net