From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ej1-x633.google.com (mail-ej1-x633.google.com [IPv6:2a00:1450:4864:20::633]) (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 32AE13B29E for ; Sat, 16 Jan 2021 16:01:29 -0500 (EST) Received: by mail-ej1-x633.google.com with SMTP id by1so11905305ejc.0 for ; Sat, 16 Jan 2021 13:01:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ySdzuyd1joA3XPj1Tq+TVon52Fn7aZx/8/9ZO0MsiJU=; b=dPKoDptzBZte7mytJmN9ClT2JPq6z9yxhjTcymG6cW9E7OpJyI5kiqGljSZGSlAH42 j/TYjm+wPTTfYN6oUe8TD33t9xn/mptFDZGFoK1DEp3XSahUKGry1ehqJI98E7QVEuKK tdXtYy9TePtJfJHDVSX1UHuUwZhEcdfiMl14k= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ySdzuyd1joA3XPj1Tq+TVon52Fn7aZx/8/9ZO0MsiJU=; b=Ibd6gOoVjXkXDf+BU9PIp8wYxdbtt+dd/9qZh6xcJUvXbEA1S12DZqLFR+gQ9TJ3E9 1SlSV3DZF8kLutPbspq6CAm8VAHNvWRj8P0hK3cLeOrVyBqJtuyZ4yzRMieb9ceokUVn vSoCWP+qNuOkIja7+Tur38YUmi9huqrAaTZUpSc4N4H5SQfzb0JJosXbcx2NVBZrPYKr jlajNtQJb5Anx/37+6qUJ+mnOcGhOJNM+AVxCzGDMAVuSbmSaAZEphWogcFcGJ+c0mtY 29pmwWV1uDJ3wFkcuck4d62LQo9AreHkdopg4Gs6t0bEL7tzIKtsT2cTHbqcS1hFwjAa 0veA== X-Gm-Message-State: AOAM532EC3crOOJXx6zqq2DXyMOHsM79svqOUplyaZAYEOoGnaLDLMCc YV8MjiWXGFIPKwusj0dUmKAQfeEyJz4lwmYfUNTFk5HWFbG1eA9rKXU5znxqJa7LgJ03YjDRDPX uDuo2d1E1AevYcMqmmHpcaNdWbMgb0CbHEsE56WrNVg== X-Google-Smtp-Source: ABdhPJz9VAb1NOJoCvIEoEhWWYGYt/Oug3oYlLJ0upDbgZT1DdnIOgyHiSIteket9QhRURYmAk/sOLf0Yog0EgpZvdg= X-Received: by 2002:a17:906:1712:: with SMTP id c18mr13240410eje.417.1610830887715; Sat, 16 Jan 2021 13:01:27 -0800 (PST) MIME-Version: 1.0 References: <87a6tarwy3.fsf@toke.dk> In-Reply-To: From: Bob McMahon Date: Sat, 16 Jan 2021 13:01:16 -0800 Message-ID: To: Dave Taht Cc: Michael Yartys , Make-Wifi-fast Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000e3ed7505b90aca60" Subject: Re: [Make-wifi-fast] Weird periodic latency X-BeenThere: make-wifi-fast@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 16 Jan 2021 21:01:29 -0000 --000000000000e3ed7505b90aca60 Content-Type: multipart/alternative; boundary="000000000000db75fd05b90aca81" --000000000000db75fd05b90aca81 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I think more current WiFi chips can do scanning without any impact to traffic per having dedicated radios for off channel estimates. Also, it's good to know the width of the latency impacts along with the delay values. Finally, fault isolation could include a UDP send with the ack as shown here . We find ping latencies, though a widely available tool, as insufficient to qualify or diagnose latency. Bob On Sat, Jan 16, 2021 at 9:48 AM Dave Taht wrote: > That implies it is doing a channel scan. Dumb. > > https://blog.cerowrt.org/post/disabling_channel_scans/ > > but what you encountered seemed more disabling than that, and the > ath10k is supposed to be able to do background channel scans. > > > On Sat, Jan 16, 2021 at 6:47 AM Michael Yartys > wrote: > > > > I'm pretty sure I've managed to figure out what causes the short sharp > periodic latency spikes. The Gnome location service uses the surrounding > wireless networks as one of the methods to determine your location. When > it's turned on I get the following results: > > > > https://imgur.com/a/pNXuVRe > > > > When it's disabled the latency spikes are gone (and notice that AQL is > working here as there is some background traffic from other clients): > > > > https://imgur.com/a/v4wWkAC > > > > Now, I wasn't able to reproduce the weird roller coaster like latency > that I saw previously. I rebooted the laptop before I did these tests, so= I > guess that solved it. > > > > Michael > > > > -- > "For a successful technology, reality must take precedence over public > relations, for Mother Nature cannot be fooled" - Richard Feynman > > dave@taht.net CTO, TekLibre, LLC Tel: 1-831-435-0729 > --=20 This electronic communication and the information and any files transmitted= =20 with it, or attached to it, are confidential and are intended solely for=20 the use of the individual or entity to whom it is addressed and may contain= =20 information that is confidential, legally privileged, protected by privacy= =20 laws, or otherwise restricted from disclosure to anyone else. If you are=20 not the intended recipient or the person responsible for delivering the=20 e-mail to the intended recipient, you are hereby notified that any use,=20 copying, distributing, dissemination, forwarding, printing, or copying of= =20 this e-mail is strictly prohibited. If you received this e-mail in error,= =20 please return the e-mail to the sender, delete it from your computer, and= =20 destroy any printed copy of it. --000000000000db75fd05b90aca81 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I think more current WiFi chips can do scanning without an= y impact to traffic per having dedicated radios for off channel
estimat= es.=C2=A0 Also, it's good to know the width of the latency impacts alon= g with the delay values. Finally, fault isolation
could=C2=A0include a = UDP send with the ack=C2=A0as shown here. We find ping latencies, though a widely = available tool, as insufficient
to qualify or diagnose latency.

Bob

On Sat, Jan 16, 2021 at 9:48 AM Dave Taht <dave.taht@gmail.com> wrote:
<= /div>
That implies it is d= oing a channel scan. Dumb.

https://blog.cerowrt.org/post/disabling_channe= l_scans/

but what you encountered seemed more disabling than that, and the
ath10k is supposed to be able to do background channel scans.


On Sat, Jan 16, 2021 at 6:47 AM Michael Yartys
<mich= ael.yartys@protonmail.com> wrote:
>
> I'm pretty sure I've managed to figure out what causes the sho= rt sharp periodic latency spikes. The Gnome location service uses the surro= unding wireless networks as one of the methods to determine your location. = When it's turned on I get the following results:
>
> https://imgur.com/a/pNXuVRe
>
> When it's disabled the latency spikes are gone (and notice that AQ= L is working here as there is some background traffic from other clients):<= br> >
> https://imgur.com/a/v4wWkAC
>
> Now, I wasn't able to reproduce the weird roller coaster like late= ncy that I saw previously. I rebooted the laptop before I did these tests, = so I guess that solved it.
>
> Michael



--
"For a successful technology, reality must take precedence over public=
relations, for Mother Nature cannot be fooled" - Richard Feynman

dave@taht.net <Da= ve T=C3=A4ht> CTO, TekLibre, LLC Tel: 1-831-435-0729

This ele= ctronic communication and the information and any files transmitted with it= , or attached to it, are confidential and are intended solely for the use o= f the individual or entity to whom it is addressed and may contain informat= ion that is confidential, legally privileged, protected by privacy laws, or= otherwise restricted from disclosure to anyone else. If you are not the in= tended recipient or the person responsible for delivering the e-mail to the= intended recipient, you are hereby notified that any use, copying, distrib= uting, dissemination, forwarding, printing, or copying of this e-mail is st= rictly prohibited. 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