From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-iw0-f171.google.com (mail-iw0-f171.google.com [209.85.214.171]) (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 7D9E0200648 for ; Sat, 21 May 2011 12:17:16 -0700 (PDT) Received: by iwn8 with SMTP id 8so5925467iwn.16 for ; Sat, 21 May 2011 12:29:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=rSXVe7cS64lOz+Ib8oi/YA4CdpkIpfjNRX24FOsGTj0=; b=o8YX6nAyA+ZS3mUXAnD9/omWtemiQ93WwCp06AajRisAxyaRJSMZBfGG63tPj55uZh bbUyV6hSGUoaeQckUT9INoRTWhiycnxfw3JlOUhag4n0boM0u2xnG2FPv8/SSncJ+/JV 8GFf7gl0qjKbH8+PdS/9fe/dP+kPXvswwPx6U= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=JscrPTAFRTyPc+cN3Ai7WHjYGaEIsNZCt97F8WYQCpLEzaEm+jlkrjN6B0679ctckL d69J6fT4AZ/bJCvrNdn4jMD4PkTO2hgPFVLlB12vHIjzf/MLmsGLXMUnxsZ7o6xI8YeR RRlDDyXFVhXvHOQl57FmsO2OKYAxNiWkpFLSU= MIME-Version: 1.0 Received: by 10.231.215.3 with SMTP id hc3mr657209ibb.156.1306006163237; Sat, 21 May 2011 12:29:23 -0700 (PDT) Received: by 10.231.31.201 with HTTP; Sat, 21 May 2011 12:29:23 -0700 (PDT) In-Reply-To: <694BB12A-0720-4CDB-B245-41A7C4E90363@gmail.com> References: <694BB12A-0720-4CDB-B245-41A7C4E90363@gmail.com> Date: Sat, 21 May 2011 13:29:23 -0600 Message-ID: From: Dave Taht To: Jonathan Morton Content-Type: multipart/alternative; boundary=000e0cd4d4dc6f2dc204a3ce4152 Cc: bloat Subject: Re: [Bloat] Applying RED93 in south africa 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: Sat, 21 May 2011 19:17:16 -0000 --000e0cd4d4dc6f2dc204a3ce4152 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Sat, May 21, 2011 at 1:11 PM, Jonathan Morton wro= te: > > On 21 May, 2011, at 5:27 pm, Dave Taht wrote: > > > Experience the pain of the Internet on another continent! (note that th= e > gw is up on ipv6 as well) > > Well, it's not very fast in terms of throughput, but the latency seems to > be about as good as I get normally. It's simulating conditions in South Africa, with settings to 840 down/380 up. > But perhaps that's because I'm starting from Northern Europe and so I'm > already used to intercontinental traffic due to the prevalence of US-base= d > servers. > > I do see occasional brief stalls during the download, but these are > substantially less intrusive than what I get on my 3G modem. They sugges= t > that packets are being dropped at reasonably regular intervals, but the T= CP > is recovering quickly. I can't tell whether RED is triggering (without E= CN) > or whether these are tail-drops on a fairly short queue. > > Incidentally my download is coming across IPv6, so it may be triggering t= he > related Linux bug. Which one? on my side all known bugs are fixed. :) > This shouldn't totally disable the negotiation though, so more likely > there's a broken router in the way. > > And it is highly likely you are interacting with slightly different layer o= f QoS if you are using IPv6. Could you take a tcpdump capture and stick it somewhere? Or let me know when you will be running a test and I'll capture traces from here? I did se= e the wan light flicker madly a few minutes ago.... How be your latency under load too? - Jonathan > > --=20 Dave T=E4ht SKYPE: davetaht US Tel: 1-239-829-5608 http://the-edge.blogspot.com --000e0cd4d4dc6f2dc204a3ce4152 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

On Sat, May 21, 2011 at 1:11 PM, Jonatha= n Morton <chr= omatix99@gmail.com> wrote:

On 21 May, 2011, at 5:27 pm, Dave Taht wrote:

> Experience the pain of the Internet on another continent! (note that t= he gw is up on ipv6 as well)

Well, it's not very fast in terms of throughput, but the latency = seems to be about as good as I get normally.

It's= simulating conditions in South Africa, with settings to 840 down/380 up. =A0
=A0B= ut perhaps that's because I'm starting from Northern Europe and so = I'm already used to intercontinental traffic due to the prevalence of U= S-based servers.

I do see occasional brief stalls during the download, but these are substan= tially less intrusive than what I get on my 3G modem. =A0They suggest that = packets are being dropped at reasonably regular intervals, but the TCP is r= ecovering quickly. =A0I can't tell whether RED is triggering (without E= CN) or whether these are tail-drops on a fairly short queue.

Incidentally my download is coming across IPv6, so it may be triggering the= related Linux bug. =A0

Which one? on my side all know= n bugs are fixed. :)


=A0
This shouldn't totally disable the negotiation though, so more likely t= here's a broken router in the way.


And it is highly l= ikely you are interacting with slightly different layer of QoS if you are u= sing IPv6.

Could you take a tcpdump=A0 capture and stick it somewher= e? Or let me know when you will be running a test and I'll capture trac= es from here? I did see the wan light flicker madly a few minutes ago....
How be your latency under load too?

=A0- Jonathan




--
Dave T=E4ht
S= KYPE: davetaht
US Tel: 1-239-829-5608
http://the-edge.blogspot.com
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