From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io1-xd30.google.com (mail-io1-xd30.google.com [IPv6:2607:f8b0:4864:20::d30]) (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 D79CB3B2A4 for ; Wed, 13 May 2020 21:00:30 -0400 (EDT) Received: by mail-io1-xd30.google.com with SMTP id j8so98539iog.13 for ; Wed, 13 May 2020 18:00:30 -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 :content-transfer-encoding; bh=m4hD9hNZpjok4N+6XoqKsvmeXgw8aal/DkPne//9ngc=; b=RssI1Szs82fQ/Qe85G7SW1zSvMBBwZYxS5aHP2H+9jtelJgKAcysmIb3N7jioPSKhs 5nOM42vXDu/c4Fz24+ln5vkQVXM9sd8XGdnIduSfDo+KkyN3bPVnzNZzp62I8NZPTy/n TZ/Q30IRSSIbn2n9fHUaG0ge+row2rFcdzFaZsEOeq4/Q/nFy6TnCM1WxiRWFvQiSRST bqQHISgZuJw9I1uqugDZGaKDIKnG9yx0LtI2sCLE74AMcn7Xvto4MqZlWNgotXR7bn2H mIy2bpSpWthe1RupNoozYcpPfqV3m4TeoUh+zZf7RIGJ+Ve9FpaRoRwoKGdWTsd7KMzs g2SA== 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:content-transfer-encoding; bh=m4hD9hNZpjok4N+6XoqKsvmeXgw8aal/DkPne//9ngc=; b=f76pw5Dxm8jA4H50AKsAmyjs7MM0cCJJYdM5aiL/kEdMcbQKEgvURzLE9JwV+2wIZy x80DPe7mCvLt7rmUqRiqeo/KkBliz721c6WEG8x20uFJ1RxWwqJlrtpC3K3LBmiSeuhW CcGs7fQ8FKxNOAcQu778+aHzKoVDE7ZXHmakh5+vyXTh9oqjIcDpexLSauPNuIEYYOwo Wey85dZIq8iBMcn/ZYUnHtWMBmpqIG8f7Oqg7x17nSFPONKJGmR1N26I4SPGZaM60y7z hytSEPeFEP2gMem8LortayEePtq/fdg0kjo52xloa2KW4rebs26vVeWj4gLBYAkK1Caw xBGA== X-Gm-Message-State: AGi0Pubd1gB9VvWwggseOfMnqbm0Nw5/qzzbGymsFC5zQNmfPuGE7b1L R4BCpxWiBaz1Zf/cUqB2/SltqhlnR8sqOayLH9/uS3cNaD0= X-Google-Smtp-Source: APiQypKjuDJbPYaVbOoa+I1BtWBKSkzGmZH9ReP0QUZnnhyr0HMXF9pDOiCqMDOeQ2UlJw7XMsXn2O2gWHhNPCyibsk= X-Received: by 2002:a05:6638:1014:: with SMTP id r20mr2176289jab.29.1589418028643; Wed, 13 May 2020 18:00:28 -0700 (PDT) MIME-Version: 1.0 References: <85F248E2-E1B5-45A6-8E45-EBCA43B82A09@gmail.com> In-Reply-To: From: Dave Taht Date: Wed, 13 May 2020 18:00:17 -0700 Message-ID: To: Make-Wifi-fast Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: [Make-wifi-fast] Fwd: [Bloat] dropbox, bbr and ecn packet capture 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: Thu, 14 May 2020 01:00:31 -0000 this was a nice bbr patch https://lore.kernel.org/netdev/20190123200454.260121-3-priyarjha@google.com= /#t ---------- Forwarded message --------- From: Alexey Ivanov Date: Sun, Apr 26, 2020 at 4:33 PM Subject: Re: [Bloat] dropbox, bbr and ecn packet capture To: Neal Cardwell Cc: Jonathan Morton , ECN-Sane , bloat Yep these are BBRv1 nodes with an older kernel (without even wifi patches[1]) so their TCP performance is quite suboptimal. Once we update Edge to 5.4 we'll start the global BBRv2 rollout to all PoPs. In the mean time, when you hit www.dropbox.com you should expect (with a very high probability) that you are hitting a BBRv1 endpoint. [1] https://lore.kernel.org/netdev/20190123200454.260121-3-priyarjha@google= .com/#t -- t: @SaveTheRbtz > On Apr 25, 2020, at 8:10 PM, Neal Cardwell via Bloat wrote: > > > From: Neal Cardwell > Subject: Re: [Bloat] dropbox, bbr and ecn packet capture > Date: April 25, 2020 at 8:10:11 PM PDT > To: Jonathan Morton > Cc: Dave Taht , ECN-Sane , bloat > > > > > On Sat, Apr 25, 2020 at 8:52 PM Jonathan Morton w= rote: > > On 26 Apr, 2020, at 3:36 am, Dave Taht wrote: > > > > I just did a rather large dropbox download. They are well known to be > > using bbr and experimenting with bbrv2. So I fired off a capture > > during a big dropbox download... > > > > It negotiated ecn, my fq_codel shaper and/or my newly ath10k > > fq_codel's wifi exerted CE, osx sent back ecn-echo, and the rtt > > results were lovely. However, there is possibly not a causal > > relationship here, and if anyone is bored and wants to scetrace, > > tcptrace or otherwise tear this cap apart, go for it. > > Well, the CE response at their end is definitely not Multiplicative Decre= ase. I haven't dug into it more deeply than that. But they're also not ru= nning AccECN, nor are they "proactively" sending CWR to get a "more accurat= e" CE feedback. I suspect they're running BBRv1 in this one. > > Agreed, that looks like BBRv1. I see a few BBRv1 PROBE_RTT phases in ther= e. > > Thanks for the trace! > > best, > neal > > > > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat _______________________________________________ Bloat mailing list Bloat@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/bloat --=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