From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yb1-xb32.google.com (mail-yb1-xb32.google.com [IPv6:2607:f8b0:4864:20::b32]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 8C54B3B29E for ; Mon, 13 Mar 2023 11:08:25 -0400 (EDT) Received: by mail-yb1-xb32.google.com with SMTP id i6so12167812ybu.8 for ; Mon, 13 Mar 2023 08:08:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aterlo.com; s=google; t=1678720105; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=P/wvqvRUoxIf8t0+V2uqAeN/ntqu4d8SPhITFyVS01Q=; b=45MVZNpEt4HKDXikRXIs1i/LUoPjkHN+TTtR430BcwS/3LyuphDJMSCfDmqCLE/Xkb WXd2AYlB26twAc+l2euno1lLL0x5k7lNkZ4MeCO1rHLOBCU79unBD8ToaIZrSy9tytau zL0opzj0BEgwnay06vnWa9i1Mk83VVHVDMkxg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678720105; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=P/wvqvRUoxIf8t0+V2uqAeN/ntqu4d8SPhITFyVS01Q=; b=ZjTAT2f4aE+1YG4XMj9vfUbvmMlSNYRs9cqhCozFKH9Lia1M+c+kHW/JwzI/wAyjws VYq2tziWg63TQk3XIaOq1fTNsdctrOOJwO8rfCwtF/aTOwTCXdFSvnt3PrxNdnH0FzpM Iwq2GezLd6KzeuC6PQ6UtzBuWl85BU1sbifDm/QC1qXbOvLR3GBRPc5Jzosi4NCsxNzD 9+gYVF8vwIK3lYRQzUpJH60D0C1NXkMDMUrP6tKP5Z2bKgBJISVMxDYTd2yzvsG56vse zLzLL+iqKyROexTs11X0oRxOZPWCAy1ih9aLh8ZjPEv5GtTA6VuOWJpgz2vPBIxr030T dwhw== X-Gm-Message-State: AO0yUKW2kTzmWSsT6imW0k4VE8oEhoSEoeTOnY/C1io8xenVILaIgB8o r4gVLeQDtw19D3s7kWbA1th7vMwCuyeHcm3SK+i8+A== X-Google-Smtp-Source: AK7set9FwrLhxWDtyweevgYFVqVGG3vhQa7WUanYk4YGN6fm9hQxyqGx2Yqz2P/oSw+M/Rw+gJ8fraQrZXu68JBjihs= X-Received: by 2002:a5b:83:0:b0:a17:c04e:bf7c with SMTP id b3-20020a5b0083000000b00a17c04ebf7cmr21239934ybp.11.1678720104921; Mon, 13 Mar 2023 08:08:24 -0700 (PDT) MIME-Version: 1.0 References: <1672786712.106922180@apps.rackspace.com> <77CCAD19-07E0-4F9E-88C1-D207CF7BF376@cable.comcast.com> <83ffc0dad19e3343e49271889369cefc@rjmcmahon.com> In-Reply-To: From: Jeremy Austin Date: Mon, 13 Mar 2023 08:08:14 -0700 Message-ID: To: Sebastian Moeller Cc: dan , Rpm , libreqos , Dave Taht via Starlink , rjmcmahon , bloat Content-Type: multipart/alternative; boundary="0000000000008812b805f6c97b9a" Subject: Re: [Rpm] [Starlink] [LibreQoS] [EXTERNAL] Re: Researchers Seeking Probe Volunteers in USA X-BeenThere: rpm@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: revolutions per minute - a new metric for measuring responsiveness List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 13 Mar 2023 15:08:25 -0000 --0000000000008812b805f6c97b9a Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Mar 13, 2023 at 3:02=E2=80=AFAM Sebastian Moeller via Starlink < starlink@lists.bufferbloat.net> wrote: > Hi Dan, > > > > On Jan 9, 2023, at 20:56, dan via Rpm wrote= : > > > > You don't need to generate the traffic on a link to measure how > > much traffic a link can handle. > > [SM] OK, I will bite, how do you measure achievable throughput > without actually generating it? Packet-pair techniques are notoriously > imprecise and have funny failure modes. > I am also looking forward to the full answer to this question. While one can infer when a link is saturated by mapping network topology onto latency sampling, it can have on the order of 30% error, given that there are multiple causes of increased latency beyond proximal congestion. A question I commonly ask network engineers or academics is "How can I accurately distinguish a constraint in supply from a reduction in demand?" --=20 -- Jeremy Austin Sr. Product Manager Preseem | Aterlo Networks preseem.com Book a Call: https://app.hubspot.com/meetings/jeremy548 Phone: 1-833-733-7336 x718 Email: jeremy@preseem.com Stay Connected with Newsletters & More: *https://preseem.com/stay-connected/* --0000000000008812b805f6c97b9a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Mon, Mar 13, 2023 at 3:02=E2=80=AF= AM Sebastian Moeller via Starlink <starlink@lists.bufferbloat.net> wrote:
Hi Dan,


> On Jan 9, 2023, at 20:56, dan via Rpm <rpm@lists.bufferbloat.net> wrote:=
>
>=C2=A0 You don't need to generate the traffic on a link to measure = how
> much traffic a link can handle.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 [SM] OK, I will bite, how do you measure achiev= able throughput without actually generating it? Packet-pair techniques are = notoriously imprecise and have funny failure modes.
I am also looking forward to the full answer to this question.= While one can infer when a link is saturated by mapping network topology o= nto latency sampling, it can have on the order of 30% error, given that the= re are multiple causes of increased latency beyond proximal congestion.

A question=C2=A0I commonly ask network engineers or a= cademics is "How can I accurately distinguish a constraint in supply f= rom a reduction in demand?"

--
--
Jerem= y Austin
Sr. Product Manager
Preseem | Aterlo Networks<= /div>
preseem.com<= /div>

Phone: 1-833-733-7336 x718

Stay Connected with Newsletters &am= p; More:=C2=A0https://preseem.com/stay-connected/
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