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[185.193.85.130]) by smtp.gmail.com with ESMTPSA id e127sm16840457wmg.10.2018.02.18.03.35.46 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 18 Feb 2018 03:35:46 -0800 (PST) From: Pete Heist Message-Id: <7E95C080-5DA6-4CD9-829A-C01D74F531E7@gmail.com> Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Date: Sun, 18 Feb 2018 12:35:46 +0100 References: <8B3FF5BA-2219-466D-B02E-C5B0C6EF0CD9@gmail.com> To: flent-users In-Reply-To: <8B3FF5BA-2219-466D-B02E-C5B0C6EF0CD9@gmail.com> X-Mailer: Apple Mail (2.3124) Subject: Re: [Flent-users] SmokePing probe X-BeenThere: flent-users@flent.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Flent discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0511398753091580631==" Errors-To: flent-users-bounces@flent.org Sender: "Flent-users" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - web6.sd.eurovps.com X-AntiAbuse: Original Domain - toke.dk X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - flent.org X-Get-Message-Sender-Via: web6.sd.eurovps.com: acl_c_authenticated_local_user: mailman/mailman X-Authenticated-Sender: web6.sd.eurovps.com: mailman@flent.org --===============0511398753091580631== Content-Type: multipart/alternative; boundary="Apple-Mail=_2C265392-6DFD-40F9-AC7C-8AF5A1BFB240" --Apple-Mail=_2C265392-6DFD-40F9-AC7C-8AF5A1BFB240 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 The author pulled the probe in pretty quickly, so it=E2=80=99s already = upstream. Some samples: https://www.drhleny.cz/bufferbloat/smokeping/irtt_smokeping.png = https://www.drhleny.cz/bufferbloat/smokeping/irtt_smokeping2.png = Maybe I=E2=80=99ll post another image after a while if something more = exciting happens=E2=80=A6 :) > On Feb 18, 2018, at 12:29 AM, Pete Heist wrote: >=20 > I wrote a SmokePing (https://oss.oetiker.ch/smokeping/) probe for = IRTT: >=20 > Code: = https://github.com/peteheist/SmokePing/blob/master/lib/Smokeping/probes/IR= TT.pm >=20 > Pull request: https://github.com/oetiker/SmokePing/pull/110 >=20 > I hope to use this in my ISP, which uses SmokePing for about 70 access = points. Since ICMP is apparently being prioritized, I don=E2=80=99t = think the current SmokePing graphs are telling much of a story about = queueing delay. >=20 > I=E2=80=99ve been mesmerized for the past couple hours watching = one-way delay stats. The link I=E2=80=99m testing is 3km NLOS = point-to-point WiFi, with trees about 100 meters from my side of the = link. When there is delay or loss, it=E2=80=99s almost always on sending = (from me). Median send IPDV (jitter) is around 5x that of the receive = IPDV. Presumably, the scattering due to the trees is worse on the uplink = because the signal hits the trees closer to the transmitter, when it = still has a longer distance to travel. This may also explain my 10/30 = asymmetric throughput. I thought about trimming these trees, but this is = too much fun=E2=80=A6 :) >=20 --Apple-Mail=_2C265392-6DFD-40F9-AC7C-8AF5A1BFB240 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
The author pulled the probe in pretty = quickly, so it=E2=80=99s already upstream. Some samples:

https://www.drhleny.cz/bufferbloat/smokeping/irtt_smokeping.png=

https://www.drhleny.cz/bufferbloat/smokeping/irtt_smokeping2.pn= g

Maybe = I=E2=80=99ll post another image after a while if something more exciting = happens=E2=80=A6 :)

On Feb 18, 2018, at 12:29 AM, Pete Heist <peteheist@gmail.com>= wrote:

I wrote a SmokePing (https://oss.oetiker.ch/smokeping/) probe for IRTT:

Code: https://github.com/peteheist/SmokePing/blob/master/lib/Smokepin= g/probes/IRTT.pm

Pull request: https://github.com/oetiker/SmokePing/pull/110

I hope to use this in my ISP, which uses = SmokePing for about 70 access points. Since ICMP is apparently being = prioritized, I don=E2=80=99t think the current SmokePing graphs are = telling much of a story about queueing delay.

I=E2=80=99ve been mesmerized for the past couple hours = watching one-way delay stats. The link I=E2=80=99m testing is 3km NLOS = point-to-point WiFi, with trees about 100 meters from my side of the = link. When there is delay or loss, it=E2=80=99s almost always on sending = (from me). Median send IPDV (jitter) is around 5x that of the receive = IPDV. Presumably, the scattering due to the trees is worse on the uplink = because the signal hits the trees closer to the transmitter, when it = still has a longer distance to travel. This may also explain my 10/30 = asymmetric throughput. I thought about trimming these trees, but this is = too much fun=E2=80=A6 :)


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