From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp73.iad3a.emailsrvr.com (smtp73.iad3a.emailsrvr.com [173.203.187.73]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 1263B21F5D3 for ; Fri, 23 Oct 2015 15:48:26 -0700 (PDT) Received: from smtp2.relay.iad3a.emailsrvr.com (localhost.localdomain [127.0.0.1]) by smtp2.relay.iad3a.emailsrvr.com (SMTP Server) with ESMTP id 602251801D5; Fri, 23 Oct 2015 18:48:25 -0400 (EDT) Received: by smtp2.relay.iad3a.emailsrvr.com (Authenticated sender: dpreed-AT-reed.com) with ESMTPSA id F2CB91804EB; Fri, 23 Oct 2015 18:48:24 -0400 (EDT) X-Sender-Id: dpreed@reed.com Received: from [100.72.51.67] (251.sub-70-199-116.myvzw.com [70.199.116.251]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA) by 0.0.0.0:465 (trex/5.4.2); Fri, 23 Oct 2015 22:48:25 GMT User-Agent: K-@ Mail X-Priority: 3 In-Reply-To: <562A9611.4050403@gmail.com> References: <562A5BE5.6010101@gmail.com> <12883.1445625688@sandelman.ca> <562A9611.4050403@gmail.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----P1DX825HFW543CH7Q7GG099BJLXZQF" Content-Transfer-Encoding: 7bit From: "David P. Reed" Date: Fri, 23 Oct 2015 18:48:22 -0400 To: Richard Smith ,Michael Richardson Message-ID: Cc: cerowrt-devel@lists.bufferbloat.net Subject: Re: [Cerowrt-devel] Problems testing sqm 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: Fri, 23 Oct 2015 22:48:49 -0000 ------P1DX825HFW543CH7Q7GG099BJLXZQF Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sqm is a way to deal with the dsl or cable modem having bufferbloat=2E In t= he configuration described neither end is the problem =2E=2E=2E the DUT its= elf may have bufferbloat=2E That would be terrible=2E On Oct 23, 2015, Ric= hard Smith wrote: >On 10/23/2015 02:41 PM, Michael = Richardson wrote: >> Richard Smith wrote: >> >= My test setup: >> >> > Laptop<--1000BaseT-->DUT<--1000baseT-->Server = >> >> So, given that the DUT is the only real constraint in the network, >w= hat >> do you expect to see from this setup? >> >> Given that the probably = DUT can't forward at Gb/s, and it certainly >can't >> shape anything, it's = gonna drop packets, and it's probably gonna drop >them in >> Rx, having ove= rrun the Rx-queue (so tail-drop)=2E If there is too much >ram >> (bufferbl= oated), then you'll see different results=2E=2E=2E > >Setting ingress/egres= s to 10Mbit/s I expected to see the speed >measurements bounce around thos= e limits with the ping times staying in >the low double digits of ms=2E W= hat I saw however, was the data rates >going well past 10Mbit limit and pi= ngs up to 2000 ms=2E > >This is what I've seen in prior rrul testing using = a the 50/10 cable >link at our office and my 25(ish)/6 link at my apartmen= t and a well >connected server on the net=2E That however was using QoS a= nd not SQM=2E > >Its that a reasonable expectation? -- Sent with K-@ Mail = - the evolution of emailing=2E ------P1DX825HFW543CH7Q7GG099BJLXZQF Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Sqm is a way to deal with the dsl or cable modem h= aving bufferbloat=2E In the configuration described neither end is the prob= lem =2E=2E=2E the DUT itself may have bufferbloat=2E That would be terrible= =2E

On Oct = 23, 2015, Richard Smith <smithbone@gmail=2Ecom> wrote:
On 10/=
23/2015 02:41 PM, Michael Richardson wrote:
Richard Smith <smithbone@gmail= =2Ecom> wrote:
My test setup:

Laptop<--1= 000BaseT-->DUT<--1000baseT-->Server

So, given that the DUT is the only real constraint in the network, whatdo you expect to see from this setup?
Given that the probably DUT can't forward at Gb/s, and it c= ertainly can't
shape anything, it's gonna drop packets, a= nd it's probably gonna drop them in
Rx, having overrun th= e Rx-queue (so tail-drop)=2E If there is too much ram
(b= ufferbloated), then you'll see different results=2E=2E=2E

Setting ingress/egress to 10Mbit/s I expected to see the spee= d
measurements bounce around those limits with the ping = times staying in
the low double digits of ms=2E What I = saw however, was the data rates
going well past 10Mbit l= imit and pings up to 2000 ms=2E

This i= s what I've seen in prior rrul testing using a the 50/10 cable
link at our office and my 25(ish)/6 link at my apartment and a well =
connected server on the net=2E That however was using Q= oS and not SQM=2E

Its that a reasonabl= e expectation?

-- S= ent with K-@ Mail - the evolut= ion of emailing=2E ------P1DX825HFW543CH7Q7GG099BJLXZQF--