From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vs1-xe35.google.com (mail-vs1-xe35.google.com [IPv6:2607:f8b0:4864:20::e35]) (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 B2F713B2A4 for ; Tue, 15 Mar 2022 18:37:32 -0400 (EDT) Received: by mail-vs1-xe35.google.com with SMTP id a186so465302vsc.3 for ; Tue, 15 Mar 2022 15:37:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nathan.io; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=FotQGJCl3I3BvL8PM8Af7Mv0iYWMmLCnGY2hD+X6i5U=; b=vuZ8AHOiqzm5uzyotbkWcQiKA/ozzNjsZCLPnNFkKBO/DC6TeXONlezteX7Ng76XfP QOUEp4EFAHlLcp/74CCQToDI2vjHrRFxj2BrVfmVbjtvA3kMOqbU4O22dpvnYwUV/8R1 Ff5kDu1zlb/DWfKLTXzKVfIqUF54FzY/kvzl7uV98C30GswgkDU3HdjvHTkBbCGtWmw/ K0rYK0uAdaWXgYnvmDvTe+s/IQUtgs5j0Rd3KVsnZ7IkEd5GPB+OejsujT6J6OjqNwEQ SkomOgnT+8hO7zP5UCY3EY0rK2fWkjLXZdvnNcdTGOXKRb96R5ssHTtcmUhjVUc49l11 7+eQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=FotQGJCl3I3BvL8PM8Af7Mv0iYWMmLCnGY2hD+X6i5U=; b=WFiBz0syGuwOrPQA3VqxfPPnE6N9DH/soJPIac8DwyE1CwM9PBpZDK8v4bjd/nyJcf 45BOfLABsPw8ZMEooRFaEqpasK+MjntoTeYuT9WMN/vZsRYt86+VS9vRir+JQZkhZkDh vCPyLWaBWWwubQij/fzEpgVe5d425r2czuT3EFDdsDgfl56fxVJm7DnY667v5CHCGiBH E4pd8QpSBDh5GoCyF7y6eQfYB3GQFWn3bwDj6EXb4/hoIkZFM5ojUTEvEPNmqhDzUSBw n3tXg0RXHGOrig9ahhhuE5xVO6w4dEteqr9DYmorX1oHasoQ+4/6715MWaP7+hlIuR4h xmxw== X-Gm-Message-State: AOAM5303L6y371rSQKSIQQBzhPmuF1i/y4+2FaGJHD2OIJRPmMFaJROR fWUUD5wPgjyf1ss5EH17ys/iMkr9G9v8r8Zw765y8A== X-Google-Smtp-Source: ABdhPJxHzwg6rs6DRmZRqCREKAwIF3IiosONfUq+IKKSgtA6on8HqWdlTyksdncyag/8Ink6OrA5kdmlQC3nbU/B7P0= X-Received: by 2002:a67:f454:0:b0:320:90a0:67f9 with SMTP id r20-20020a67f454000000b0032090a067f9mr11793813vsn.80.1647383851976; Tue, 15 Mar 2022 15:37:31 -0700 (PDT) MIME-Version: 1.0 References: <08c6ab5c-6a9d-e555-671c-5c59cffcd02d@falco.ca> In-Reply-To: <08c6ab5c-6a9d-e555-671c-5c59cffcd02d@falco.ca> From: Nathan Owens Date: Tue, 15 Mar 2022 15:37:21 -0700 Message-ID: To: Daniel AJ Sokolov Cc: starlink@lists.bufferbloat.net Content-Type: multipart/alternative; boundary="0000000000004e630405da4971bb" Subject: Re: [Starlink] Optimized for Speedtest? X-BeenThere: starlink@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Starlink has bufferbloat. Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Mar 2022 22:37:32 -0000 --0000000000004e630405da4971bb Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I don=E2=80=99t think that=E2=80=99s technically correct - the system sched= ules user slots on a 15s interval: "SpaceX also provides customers with their own phased-array terminal to be deployed at their service location to connect directly to the satellite=E2= =80=99s Ku- band RF beam. assigned to the user=E2=80=99s service area. Because the = Starlink satellites are constantly moving, the network plans these connections on 15 second intervals, continuously re-generating and publishing a schedule of connections to the satellite fleet and handing off connections between satellites." =E2=80=9CThe ability to control hand-offs in software with millisecond prec= ision allows SpaceX to turn the constant motion of the constellation into a key advantage for the Starlink network. These micro-adjustments enhance Starlink=E2=80=99s reliability and enables more efficient management of cap= acity in real time.=E2=80=9D My assumption is the connection switching is make-after-break, meaning there will be some delay in switching satellites, which seems to cause a brief increase in loss and buffering. On Tue, Mar 15, 2022 at 3:09 PM Daniel AJ Sokolov wrote: > Hello, > > From this list I have learned that Starlink is optimized to shine in > tests with speedtest.net and similar sites, but that transmission rates > drop quickly after about 15 seconds. > > How do they do that, technically? > > Is that a result of Bufferbloat? Is that a a specific code in the modem > to cheat, like some car manufacturers cheated on emissions tests? Is > that something done in the satellites who shift capacity from other > users to those users who initiate downloads? Is that done on the backhaul= ? > > Thank you > Daniel > _______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink > --0000000000004e630405da4971bb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I don=E2=80=99t think that=E2=80=99s technically cor= rect - the system schedules user slots on a 15s interval:=C2=A0

"SpaceX also provides cust= omers with their own phased-array terminal to be deployed at their service = location to connect directly to the satellite=E2=80=99s Ku- band RF beam. a= ssigned to the user=E2=80=99s service area. Because the Starlink satellites= are constantly moving, the network plans these connections on=C2=A0= 15=C2=A0second intervals, continuously re-generating and publishing a sche= dule of connections to the satellite fleet and handing off connections betw= een satellites."
=E2=80=9CThe abi= lity to control hand-offs in software with millisecond precision allows Spa= ceX to turn the constant motion of the constellation into a key advantage f= or the Starlink network. These micro-adjustments enhance Starlink=E2=80=99s= reliability and enables more efficient management of capacity in real time= .=E2=80=9D

My assumption is the connection switching is make-after-brea= k, meaning there will be some delay in switching satellites, which seems to= cause a brief increase in loss and buffering.=C2=A0

<= br>
On Tue, Mar 15, 2022 at 3:09 PM Daniel AJ Sokolo= v <daniel@falco.ca<= /a>> wrote:
Hello,

=C2=A0From this list I have learned that Starlink is optimized to shine in =
tests with speedtest.net and similar sites, but that transmission rates
drop quickly after about 15 seconds.

How do they do that, technically?

Is that a result of Bufferbloat? Is that a a specific code in the modem to cheat, like some car manufacturers cheated on emissions tests? Is
that something done in the satellites who shift capacity from other
users to those users who initiate downloads? Is that done on the backhaul?<= br>
Thank you
Daniel
_______________________________________________
Starlink mailing list
Starlin= k@lists.bufferbloat.net
https://lists.bufferbloat.net/listinfo/starlink
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