From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-il1-x129.google.com (mail-il1-x129.google.com [IPv6:2607:f8b0:4864:20::129]) (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 6527B3B29E for ; Sun, 17 May 2020 15:38:06 -0400 (EDT) Received: by mail-il1-x129.google.com with SMTP id t12so7810763ile.9 for ; Sun, 17 May 2020 12:38:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=lbJhVgK5UXc/ATLWySWH7MtUXPtTPswT3bFybpoT3O4=; b=D0jlEs/Ax6o1ffrl/U9arTYWrWjLsZ1PtwznhBfevKylG92fvDAY7g3wHArQaPM9aW 8dqLiUq9a9+u5htBkFcZ9H4K3jlp642leJ06vOmF32YibVwavpWbHM1NkA76lShw6phV SaD3rY5xYbgZJsj2A+Dx+rAhcCbBdZVjUOFPFjJ5MRAt8F7MZsv9QY+MniDm5bXO2mju 4vBcZyn9wQmDPmF1K0g/sH1K8XZCfqMNkyvUb6N/MmaeQyJo6Zhepkc9sJAKKglOa5Q0 gjXEUHALflObjTNWvobJZ9GmuJpSq0sjD4OEGm4cPaIPuFiTgau5JLDMyCkBXR6GLh39 vrwA== 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:content-transfer-encoding; bh=lbJhVgK5UXc/ATLWySWH7MtUXPtTPswT3bFybpoT3O4=; b=ZEN+ENN4D5gnUpRub+xDysP5i+h/2x51tiIDVjBDu1sbLn98Z05Rp0atBRXMvB/KO7 VU7LEKcKy1zRmXlJrw+CcnbGhKm9sdhLFp1jBvT+1Ci0VmD040qViN+xiTF92Rcex9ts PD1GOgSZXVvjqetkLA7/6T8Lv/V5LzT4/PX3QaORL8isiy0q5LwsBMGKgCSpoznqSnFt 9Vj1u8uSY5KhchLmMf48NXG6MhKCyLpI+XZ9CI3W3PPBey1wW5X+UTveb2EodYhCMBwo MRPDAHnN57NrKpu5o8sBmVRhPRI8WLZ32+hE1zlVW1O3J73cH+01/2x5eieRhOD4maKC iX4A== X-Gm-Message-State: AOAM533UMQIB1Vq3VUIvLm98GDzNtHpDo1nXCikaCLodkSmeOdPSYI0u 5Gs6hfk+rGqx0mNE8sGZfNoD37yxFydvN055ZMg= X-Google-Smtp-Source: ABdhPJz8YAK3Dto8wUGJc0QhZMIUqW0WVZcmmabEj6tO1snlAaiDRkCKsR0wj1TMkKn49kITvpkXu/nBU0Ce2uRsAD8= X-Received: by 2002:a92:3c99:: with SMTP id j25mr12966139ilf.249.1589744285853; Sun, 17 May 2020 12:38:05 -0700 (PDT) MIME-Version: 1.0 References: <1ce5f16e-5b39-6aa0-a29b-cdd93a268d72@smallnetbuilder.com> <47a1272a-e2a6-eab0-2987-341e4a7d5c75@smallnetbuilder.com> In-Reply-To: From: Dave Taht Date: Sun, 17 May 2020 12:37:53 -0700 Message-ID: To: Tim Higgins Cc: Make-Wifi-fast , Felix Fietkau , John Crispin Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [Make-wifi-fast] Real router latency comparison 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: Sun, 17 May 2020 19:38:06 -0000 On Sun, May 17, 2020 at 11:57 AM Dave Taht wrote: > > Tim: > > well, can you run the test with the _be test, not mixed dscps, also? > > Also are you getting actual latency differences from using each dscp? > or summing it? An example of where you can go wrong by summing things was in my old make-wifi-fast preso here: where given the 3-10 sec of latency built into the ath10k driver at the tim= e 5 flows grabbed all the bandwidth, and the other 95 failed to start entirel= y. https://blog.linuxplumbersconf.org/2016/ocw/system/presentations/3963/origi= nal/linuxplumbers_wifi_latency-3Nov.pdf > > A lot of vendors don't differentiate at all. individual stream plots > out of this data would show this, no difference in latency, across > mixed dscps. in that case, one vendor actually following the 802.11e > spec, and others not, hmmm. On the other hand, it is certainly possible that ofdma and DU have finally got to where they could priority schedule stuff. you'd have to look at the air.... > > But: I've always recommended openwrt turn off 802.11e differentiation > on the AP, and this is why. It is VASTLY better to optimumize for > 802.11n aggregation than 802.11e. on the AP. Clients, sure, try it.... > > I know/knew exactly what the two things wrong here, but never got > around to fixing it, as in practice dscps are hardly used at all. Three things, sorry. 0) Using anything other from the BE queue. This can be fixed with a proper qos-map value in the ap's conf file. I don't know how to do that in openwrt yet - I always just patched it out. > 1) we use up a txop in all the queues rather than just 1 at a time. > 2) the codel algorithm has some weird code in it the mucks with the > target when it shouldn't and we use a too large target for 5ghz. > > Still not bad for a 2x ap against bigger fatter tech that I personally > have never seen. > > THX FOR THE TEST!!! And ping is not the best test. Synthetic voice or videoconferncing traffic would be better. irtt might be something worth using or some other rtp or webrtc test suite. Still, I expected to lose on this, but we didn't lose badly, and unlike those other vendors, evenroute and openwrt folk *listen* and do what they can to improve things. > > On Sun, May 17, 2020 at 11:47 AM Tim Higgins wr= ote: > > > > Hi all, > > > > Attached are previews of results I'll be publishing in the Part 2 artic= le. > > > > The same test was run on four routers: > > - NETGEAR R7800 (Qualcomm 4 stream AC) > > - Evenroute IQrouter v3 (Mediatek 2 stream AC, Wifi stack is "vanilla"O= penWRT for the MT76" according to Evenroute) > > - NETGEAR RAX120 (Qualcomm four stream AX) - OFDMA enabled > > - NETGEAR RAX45 (Broadcom four stream AX) - OFDMA enabled > > > > AP set to Channel 36, 80 MHz bandwidth, WPA2 PSK connection > > > > Each STA shows 867 Mbps link rate. Signal level ~ -45 dBm. > > > > iperf3 TCP/IP traffic run simultaneously to all four STAs (Intel AX200,= Win 10, 21.80.2.1 driver) > > bitrate (-b): 50Mbps > > length (-l): 256 Bytes > > DSCP values (--dscp), one per STA: 0 (CS0), 96 (CS3), 160 (CS5), 192 (C= S6) > > > > 200ms interval ping run concurrently from AP to STA on each pair. Ping = is always AP to STA for both uplink and downlink traffic. > > > > Congestion was measured using a Qualcomm AX STA associated to the AP, r= unning 1bps of traffic so that stats could be recorded. > > > > Thoughts? > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > Tim > > _______________________________________________ > > 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 public > relations, for Mother Nature cannot be fooled" - Richard Feynman > > dave@taht.net CTO, TekLibre, LLC Tel: 1-831-435-0729 --=20 "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