From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-x22d.google.com (mail-io0-x22d.google.com [IPv6:2607:f8b0:4001:c06::22d]) (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 7099A3B25E; Wed, 10 Aug 2016 17:58:45 -0400 (EDT) Received: by mail-io0-x22d.google.com with SMTP id b62so54663067iod.3; Wed, 10 Aug 2016 14:58:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=GCq0Yek0hRyHRKIVV4er2dXNUq0aMKVslHB+Yzm8FYY=; b=Jb4CFBkEpsh+iPUdxBB6gTJeD+uk27o8cfNJETzhBL9h+Dj+Po9rBMnCYTJxzrpMB3 CMu0HtAgrtNPbN4BE+N/+VKorrlXK1kJReftulY/x118uD5uEXfAw3sy+hhQzsLUDlF6 /eLPUbFQMQ8NISt2w/4piC2KE5Fp0kNu5qMZd+Q6ZmUU4G2SQ+wb/1RdZhXk6X253JCN M20ASpxuu22l/JSGjxDylpr/DbMqBYISeKT5kPCfHGOsXPP04x9tXFmn6fF8x1SPjn0D MsPOX3fvTttPMu7mw3G6ZEx8GrhmftdkjcVnBbTktotGxkFJ65ob8EGVyGnjuyHGEY2X CsxA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=GCq0Yek0hRyHRKIVV4er2dXNUq0aMKVslHB+Yzm8FYY=; b=L5/6I17Jrhiytf6+N5i50ISnZFsAtTucejw5peDqejWHmaRGMz6qPgjaN3vvaTESe+ 8tL7yvQZXuf4W+h7Z3c8aqkuOPgo6WWHe4s6jxce25fgEShseYM8MLuYUG3ETaqL/W5t XeMjL9NNfxGw+TA2OnP/xiqOz0Ul1/BbNJzxVTmN9NYWJWZPKPa4xU4+1n1drVfA1qag SMsLfCKW1/e6hxtWlwpAFojP0+bF9wP0aHleAJhr5yCpp0Lu6yEIMiUP+FsrHByPtsdE 8qS779c5li7Ke++Nn0YW9cc/9ygzkkj6uMvv1id/GcGj6DoO99uy5BoWOCBWPp3M+MUx BmIg== X-Gm-Message-State: AEkooutKRjhCHNfSQy/blYe1zdV9NbxMbCQ4j9uThD0K/E8WZPZ21YnP/RI94hzGqj8IfqGEOw3xuCOj8+A5jQ== X-Received: by 10.107.201.145 with SMTP id z139mr8188231iof.139.1470866324865; Wed, 10 Aug 2016 14:58:44 -0700 (PDT) MIME-Version: 1.0 Received: by 10.36.13.200 with HTTP; Wed, 10 Aug 2016 14:58:44 -0700 (PDT) In-Reply-To: <87bn109tv8.fsf@toke.dk> References: <76eb6a6a-2f39-3b36-d4c1-04198083c0f6@gmail.com> <87oa50acnr.fsf@toke.dk> <87bn109tv8.fsf@toke.dk> From: Dave Taht Date: Wed, 10 Aug 2016 23:58:44 +0200 Message-ID: To: =?UTF-8?B?VG9rZSBIw7hpbGFuZC1Kw7hyZ2Vuc2Vu?= Cc: make-wifi-fast@lists.bufferbloat.net, "cerowrt-devel@lists.bufferbloat.net" , Felix Fietkau Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Subject: Re: [Cerowrt-devel] [Make-wifi-fast] wifi airtime fairness patches could use eyeballs and testing X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Aug 2016 21:58:45 -0000 On Wed, Aug 10, 2016 at 11:50 PM, Toke H=C3=B8iland-J=C3=B8rgensen wrote: > Toke H=C3=B8iland-J=C3=B8rgensen writes: > >> On 10 August 2016 21:35:40 CEST, Dave Taht wrote: >>>Wow, that *is* weird. It is good to see the tcp window changing on >>>this set of data (it wasn't before), and CWRs, but... hmmm... SCIENCE. >>> >>>Enabling ecn on both sides will rule out some potential bugs. >> >> Yeah, couldn't get ecn to work on the host I was using as the other endp= oint on >> that test. Will try with another box that's not on quite as ancient a ke= rnel. >> Was also planning to disable codel (by setting a very high target) to tr= y to >> narrow down the problem. > > OK, digging some more on this: > > I am seeing *no* drops by CoDel, and no backlog in the mac80211 softq > layer either (or at most one or two packets when polling with a 1 sec > interval). This is with one as well as with two flows. But there are tons of drops evident from the captures. > On my x86 testbed I see backlog building and packets getting dropped by > CoDel - and can't reproduce the performance hit. So I'm wondering what > the difference is. I can think of: > > - Another bottleneck somewhere in the system limiting things on the > wndr3800. > > - A locking issue in the FQ mechanism preventing packets from being > queued properly. > > - Something related to the wndr only having a single CPU. > > -Toke --=20 Dave T=C3=A4ht Let's go make home routers and wifi faster! With better software! http://blog.cerowrt.org