From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ej1-x634.google.com (mail-ej1-x634.google.com [IPv6:2a00:1450:4864:20::634]) (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 C04D23CB35 for ; Fri, 15 Jan 2021 16:44:54 -0500 (EST) Received: by mail-ej1-x634.google.com with SMTP id ke15so7691186ejc.12 for ; Fri, 15 Jan 2021 13:44:54 -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=gsXBeRONsBYgO8D35DcCmxi6xDoxDORLiqWVaJLQB1A=; b=AKk7+lwZiTmtUp/FCS7gwkI1RI+tjGKEOYRmdhFij+ynPvhkr8CnkhlFGpx9bDP5+t nslndigFvKdsaCeeVnnnm9NIb6ywKmoKTxsM0T05P04OgvIbAe1iUNCXo82xnfBTlI7V OpSjOdnSwy3ptYGPQXhebmLQLHTcPWSZYMc3E= 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=gsXBeRONsBYgO8D35DcCmxi6xDoxDORLiqWVaJLQB1A=; b=NljnHkU62IrD3pBUdoxIJWvDUvIyWZ6pwKxeZnadWLyDZQNQaFX47MENWZAea1sBlO WWBezR4IBwjA/T/gWBYRx238Y9ejk5pDE5hfOVjnbP0hZ1Hiyan3si8R+gizQxv38SsC NQjz54LJig4jcga+ktbJ7OJgNzaalqZ+4bWfS0uWpX/yh6hBs1NQJRnb1756kLh2SHiF eFcNfvKg/0fwBZJS5B0iAQS6Pt82KtoYvqacKm08nHDwIib02UgujIOHHZrbjDT1eCE6 PJrhbvjnssgH5NLd1Z4sdAsYrZeqm6oYUcXtuFbPLsNAWpR5tIlUcHTb1iZMCQp7CGyB Q8FA== X-Gm-Message-State: AOAM532UUke9CCPu5wgPJAywzhsrJrNfnHFgNhDrdHeSpKJptOrhJyKf SNhltJNJcE05Mwbi1NW8QO1EqV5OBpWbZ8wozPcbJsTcPQkO+95EZBLxPMULKuRc25WCLB4AVsv dHIL0ZCKL7SW9xX1DINSj2qasWxENcOXRZ2eK1GS2yQ== X-Google-Smtp-Source: ABdhPJx45lOxCct7i8CxihN3Fh1TdMx/tusvDQ8JTO49yg195NEgV4+69lx/ocunRx/ktED3ft98ma99hCbPirXKHQo= X-Received: by 2002:a17:907:c2a:: with SMTP id ga42mr7562926ejc.511.1610747093436; Fri, 15 Jan 2021 13:44:53 -0800 (PST) MIME-Version: 1.0 References: <87a6tarwy3.fsf@toke.dk> In-Reply-To: From: Bob McMahon Date: Fri, 15 Jan 2021 13:44:42 -0800 Message-ID: To: Michael Yartys Cc: Dave Taht , Make-Wifi-fast Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000005e59bb05b8f748ee" 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: Fri, 15 Jan 2021 21:44:55 -0000 --0000000000005e59bb05b8f748ee Content-Type: multipart/alternative; boundary="00000000000054520c05b8f748e5" --00000000000054520c05b8f748e5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable If you want to isolate wifi from the router CPU, connect a device (raspberry pi 4 to the lan switch) and run tests. Also, for more detailed testing, sync the clocks to the GPS atomic clock using pulse per second and try out some iperf 2.1 new features. Bob On Fri, Jan 15, 2021 at 11:33 AM Michael Yartys via Make-wifi-fast < make-wifi-fast@lists.bufferbloat.net> wrote: > On Friday, January 15th, 2021 at 20:10, Dave Taht > wrote: > > > oops meant to cc the list > > > > On Fri, Jan 15, 2021 at 11:09 AM Dave Taht dave.taht@gmail.com wrote: > > > > > On Fri, Jan 15, 2021 at 9:00 AM Michael Yartys via Make-wifi-fast > > > > > > make-wifi-fast@lists.bufferbloat.net wrote: > > > > > > > I assume that I got it right by running: > > > > > > > > flent --test-parameter ping_hosts=3D1.1.1.1 -l 300 > netperf-eu.bufferbloat.net tcp_8down > > > > > > > > Either way, I think I'll have to do this test at another time since > someone is streaming TV downstairs (via Ethernet!) and it really pollutes > the results: https://imgur.com/a/F33LjeA > > > > > > I wouldn't say that pollutes the results, I'd say those are the > > > > > > typical and terrible results most users get when trying to do more > > > > > > than one thing at once on wifi or over the internet. Also it helps to > > > > > > have sqm on your isp updownlink, especially with netflix as it is > > > > > > bursty as heck > > > > > > I do not know if aql is enabled on that chipset. To my eye, it isn't, > > > > > > but the induced latency isn't quite high enough to represent what I > > > > > > viewed as the baseline problems. > > Yup, AQL is enabled on this chipset, and I also have SQM piece_of_cake > enabled to 50/50 mbps. I ran another test and made sure that there was no > significant activity on the wireless network before I started it. Here ar= e > the results: https://imgur.com/a/7MzMVVJ > > And the ping to 1.1.1.1 has the same shape: https://imgur.com/a/drcTGfv > > Looks quite weird to me with all the oscillating latency spikes. > > > > > > https://forum.openwrt.org/t/aql-and-the-ath10k-is-lovely/59002 > > > > > > Do a packet capture at the AP and look for multciast bursts especiall= y > > I think I'll have to find a moment where I have the network to myself > again to be able to properly test things and figure out what might be > causing this stuff. I'll probably do a packet capture at some point. > > > > > > > And I keep trying to set aside time to go deep on AQL again, as the > > > > > > 7800 is a pretty popular box... > > > > > > > For what it's worth, the ping to 1.1.1.1 looks the same. > > > > > > > > Michael > > > > > > > > =E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90 Ori= ginal Message =E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80= =90 > > > > > > > > On Friday, January 15th, 2021 at 17:23, Toke H=C3=B8iland-J=C3=B8rg= ensen > toke@toke.dk wrote: > > > > > > > > > Michael Yartys via Make-wifi-fast > make-wifi-fast@lists.bufferbloat.net > > > > > > > > > > writes: > > > > > > > > > > > Hi > > > > > > > > > > > > I decided to run a couple of flent 8-stream TCP downloads from > > > > > > > > > > > > netperf-eu.bufferbloat.net to my Fedora 33 laptop, and I > noticed some > > > > > > > > > > > > weird periodic latency in the resulting graphs. My router is th= e > > > > > > > > > > > > NETGEAR R7800 running OpenWrt with an ath10k radio. Here's a > graph > > > > > > > > > > > > that's representative of the results that I got: > > > > > > > > > > > > https://imgur.com/a/BOKNzht > > > > > > > > > > > > This looks similar to the latency spikes you would get from > channel > > > > > > > > > > > > scans, but I have specified the BSSID in the Gnome network > settings, > > > > > > > > > > > > which means that background scanning should be disabled. In > addition, > > > > > > > > > > > > the test ran for 30 minutes, and channel scans are much more > frequent > > > > > > > > > > > > than the latency spikes seen in the graph above. Here's what > channel > > > > > > > > > > > > scans look like in a 15 minute long test: > https://imgur.com/a/YJepfcp > > > > > > > > > > > > Does anyone here know what could be causing this behaviour? > > > > > > > > > > Hmm, your email reminds me that the server you are testing agains= t > was > > > > > > > > > > having some issue before the holidays. So it may just be that it'= s > > > > > > > > > > crapping out and it has nothing to do with your connection. > > > > > > > > > > You could try adding a secondary ping flow (--test-parameter > > > > > > > > > > ping_hosts=3Done.one.one.one should do it) and see if that second= ary > flow > > > > > > > > > > also shows the same spikes. If it does, it's likely your > connection, if > > > > > > > > > > not it's likely the server... > > > > > > > > > > -Toke > > > > > > > > Make-wifi-fast mailing list > > > > > > > > Make-wifi-fast@lists.bufferbloat.net > > > > > > > > https://lists.bufferbloat.net/listinfo/make-wifi-fast > > > > > > -- > > > > > > "For a successful technology, reality must take precedence over publi= c > > > > > > relations, for Mother Nature cannot be fooled" - Richard Feynman > > > > > > dave@taht.net CTO, TekLibre, LLC Tel: 1-831-435-0729 > > > > -- > > > > "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 > _______________________________________________ > Make-wifi-fast mailing list > Make-wifi-fast@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/make-wifi-fast --=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. --00000000000054520c05b8f748e5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
If you want to isolate=C2=A0wifi from the router CPU, conn= ect a device (raspberry=C2=A0pi 4 to the lan switch) and run tests.

= Also, for more detailed testing, sync the clocks to the GPS atomic clock using pulse pe= r second and try out some iperf 2.1 new features.

Bob

On Fri, Jan 15, 2021 at 11:33= AM Michael Yartys via Make-wifi-fast <make-wifi-fast@lists.bufferbloat.n= et> wrote:
dave.taht@gmail.com> wrote:
> oops meant to cc the list
>
> On Fri, Jan 15, 2021 at 11:09 AM Dave Taht dave.taht@gmail.com wrote:
>
> > On Fri, Jan 15, 2021 at 9:00 AM Michael Yartys via Make-wifi-fast=
> >
> > make-wifi-fast@lists.bufferbloat.net wrote:
> >
> > > I assume that I got it right by running:
> > >
> > > flent --test-parameter ping_hosts=3D1.1.1.1 -l 300 netperf-eu.bufferbloat.net tcp_8down
> > >
> > > Either way, I think I'll have to do this test at another= time since someone is streaming TV downstairs (via Ethernet!) and it reall= y pollutes the results: https://imgur.com/a/F33LjeA
> >
> > I wouldn't say that pollutes the results, I'd say those a= re the
> >
> > typical and terrible results most users get when trying to do mor= e
> >
> > than one thing at once on wifi or over the internet. Also it help= s to
> >
> > have sqm on your isp updownlink, especially with netflix as it is=
> >
> > bursty as heck
> >
> > I do not know if aql is enabled on that chipset. To my eye, it is= n't,
> >
> > but the induced latency isn't quite high enough to represent = what I
> >
> > viewed as the baseline problems.

Yup, AQL is enabled on this chipset, and I also have SQM piece_of_cake enab= led to 50/50 mbps. I ran another test and made sure that there was no signi= ficant activity on the wireless network before I started it. Here are the r= esults: https://imgur.com/a/7MzMVVJ

And the ping to 1.1.1.1 has the same shape: https://imgur.com/a/drcTGfv

Looks quite weird to me with all the oscillating latency spikes.
> >
> > https://forum.openwrt.org/t/= aql-and-the-ath10k-is-lovely/59002
> >
> > Do a packet capture at the AP and look for multciast bursts espec= ially

I think I'll have to find a moment where I have the network to myself a= gain to be able to properly test things and figure out what might be causin= g this stuff. I'll probably do a packet capture at some point.

> >
> > And I keep trying to set aside time to go deep on AQL again, as t= he
> >
> > 7800 is a pretty popular box...
> >
> > > For what it's worth, the ping to 1.1.1.1 looks the same.=
> > >
> > > Michael
> > >
> > > =E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80= =90 Original Message =E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90= =E2=80=90
> > >
> > > On Friday, January 15th, 2021 at 17:23, Toke H=C3=B8iland-J= =C3=B8rgensen toke@toke.d= k wrote:
> > >
> > > > Michael Yartys via Make-wifi-fast make-wifi-fast@lists.b= ufferbloat.net
> > > >
> > > > writes:
> > > >
> > > > > Hi
> > > > >
> > > > > I decided to run a couple of flent 8-stream TCP do= wnloads from
> > > > >
> > > > > netperf-eu.bufferbloat.net to my Fedo= ra 33 laptop, and I noticed some
> > > > >
> > > > > weird periodic latency in the resulting graphs. My= router is the
> > > > >
> > > > > NETGEAR R7800 running OpenWrt with an ath10k radio= . Here's a graph
> > > > >
> > > > > that's representative of the results that I go= t:
> > > > >
> > > > > https://imgur.com/a/BOKNzht
> > > > >
> > > > > This looks similar to the latency spikes you would= get from channel
> > > > >
> > > > > scans, but I have specified the BSSID in the Gnome= network settings,
> > > > >
> > > > > which means that background scanning should be dis= abled. In addition,
> > > > >
> > > > > the test ran for 30 minutes, and channel scans are= much more frequent
> > > > >
> > > > > than the latency spikes seen in the graph above. H= ere's what channel
> > > > >
> > > > > scans look like in a 15 minute long test: https= ://imgur.com/a/YJepfcp
> > > > >
> > > > > Does anyone here know what could be causing this b= ehaviour?
> > > >
> > > > Hmm, your email reminds me that the server you are test= ing against was
> > > >
> > > > having some issue before the holidays. So it may just b= e that it's
> > > >
> > > > crapping out and it has nothing to do with your connect= ion.
> > > >
> > > > You could try adding a secondary ping flow (--test-para= meter
> > > >
> > > > ping_hosts=3Done.one.one.one should do it) and see if t= hat secondary flow
> > > >
> > > > also shows the same spikes. If it does, it's likely= your connection, if
> > > >
> > > > not it's likely the server...
> > > >
> > > > -Toke
> > >
> > > Make-wifi-fast mailing list
> > >
> > > Make-wifi-fast@lists.bufferbloat.net
> > >
> > > https://lists.bufferbloat.net/li= stinfo/make-wifi-fast
> >
> > --
> >
> > "For a successful technology, reality must take precedence o= ver public
> >
> > relations, for Mother Nature cannot be fooled" - Richard Fey= nman
> >
> > dave@taht.net<= /a> <Dave T=C3=A4ht> CTO, TekLibre, LLC Tel: 1-831-435-0729
>
> --
>
> "For a successful technology, reality must take precedence over p= ublic
>
> relations, for Mother Nature cannot be fooled" - Richard Feynman<= br> >
> dave@taht.net &= lt;Dave T=C3=A4ht> CTO, TekLibre, LLC Tel: 1-831-435-0729
_______________________________________________
Make-wifi-fast mailing list
M= ake-wifi-fast@lists.bufferbloat.net
https://lists.bufferbloat.net/listinfo/make-wif= i-fast

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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