From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-x236.google.com (mail-ob0-x236.google.com [IPv6:2607:f8b0:4003:c01::236]) (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 389C321F100 for ; Tue, 25 Feb 2014 08:46:26 -0800 (PST) Received: by mail-ob0-f182.google.com with SMTP id uz6so761889obc.27 for ; Tue, 25 Feb 2014 08:46:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=N/YrqefWAzvgCZYvPdJQucGJjnLsHcm5aRf4dhlY1Lg=; b=C/Wrtsw7AFVtdbUANkKOuIfJmZgnjJWT39eLX/mMhgCgQ0XFs4vOTR2ILzIhixCXSu EoBsjBVcxSqECog1466xH80i2UFXki9B7Q0e2U8KZWxZ/OguOdFqhs64YTt+onf3Gcco JSpJbJKIEC62yYRqXUbHVGHScVntd5ugUKwYD3SWK+DDjfCGak8oJnkM5NKpa/vLk+bt BA+Gk/6czFinBeTnr9zUbZnTxBw2PXO5ebCUrRsVM/vf8B5eP9HE3WVejMXuLNtZ2sp7 5prGvV7sZoFChUczRRRayrSZ+hN3W/zV+0YEVCgUvA074j9eD/YOo34mC3FzJCSniKru 0SPA== MIME-Version: 1.0 X-Received: by 10.60.161.81 with SMTP id xq17mr2176429oeb.3.1393346785167; Tue, 25 Feb 2014 08:46:25 -0800 (PST) Sender: gettysjim@gmail.com Received: by 10.76.84.162 with HTTP; Tue, 25 Feb 2014 08:46:25 -0800 (PST) In-Reply-To: References: <530C7AFA.2070101@gmail.com> Date: Tue, 25 Feb 2014 11:46:25 -0500 X-Google-Sender-Auth: FTaVH2ohRpX81G1Bkp3NSbcwrVw Message-ID: From: Jim Gettys To: Nicholas Weaver Content-Type: multipart/alternative; boundary=089e01229a8c2dcfc304f33dd470 Cc: "cerowrt-devel@lists.bufferbloat.net" Subject: Re: [Cerowrt-devel] uplink_buffer_adjustment X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Feb 2014 16:46:29 -0000 --089e01229a8c2dcfc304f33dd470 Content-Type: text/plain; charset=ISO-8859-1 On Tue, Feb 25, 2014 at 11:02 AM, Nicholas Weaver wrote: > > On Feb 25, 2014, at 7:59 AM, Jim Gettys wrote: > > So it is arguably a "bug" in netalyzr. It is certainly extremely > misleading. > > > > Nick? > > Rewriting it as a TCP-based stresser is definatly on our to-do list. > Good; though I'm not sure you'll be able to build a TCP one that fills the buffers fast enough to determine some of the buffering out there (at least without hacking the TCP implementation, anyway). The other piece of this is detecting flow queuing being active; this makes a bigger difference to actual latency than mark/drop algorithms do by themselves. - Jim > > > -- > Nicholas Weaver it is a tale, told by an idiot, > nweaver@icsi.berkeley.edu full of sound and fury, > 510-666-2903 .signifying nothing > PGP: http://www1.icsi.berkeley.edu/~nweaver/data/nweaver_pub.asc > > --089e01229a8c2dcfc304f33dd470 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable


On Tue= , Feb 25, 2014 at 11:02 AM, Nicholas Weaver <nweaver@icsi.berkel= ey.edu> wrote:

On Feb 25, 2014, at 7:59 AM, Jim Gettys <jg@freedesktop.org> wrote:
> So it is arguably a "bug" in netalyzr. =A0It is certainly ex= tremely misleading.
>
> Nick?

Rewriting it as a TCP-based stresser is definatly on our to-do list.<= br>

Good; though I'm not sure you'll be able to build a TCP = one that fills the buffers fast enough to determine some of the buffering o= ut there (at least without hacking the TCP implementation, anyway).

The o= ther piece of this is detecting flow queuing being active; this makes a big= ger difference to actual latency than mark/drop algorithms do by themselves= .
=A0 =A0 =A0 =A0 =A0 = =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 - Jim


--
Nicholas Weaver =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0it is a tale, told by an= idiot,
nweaver@icsi.berkeley.edu = =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0full of sound and fury,
510-666-2903=A0 =A0= =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0.signifying not= hing
PGP: http://www1.icsi.berkeley.edu/~nweaver/data/nweaver_pub= .asc


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