From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-x22f.google.com (mail-ob0-x22f.google.com [IPv6:2607:f8b0:4003:c01::22f]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id DFBFC21F3C9 for ; Sat, 7 Mar 2015 07:43:18 -0800 (PST) Received: by obcwp18 with SMTP id wp18so14800300obc.6 for ; Sat, 07 Mar 2015 07:43:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=91uQlLBQn/JIT6h5YfwAuVx2BBphlOfPK1HzM3Lae90=; b=KSVRxUiZPRTzRQlDnD6Y4vzI9uQr8H1pP7ubDujKy6s4O6AyOvRmrQzqjCQlEO+pg7 MvBGpCKcY/tzlxrcVi8v9zfa1rWIDQewGQ/M1iAEs83VzXHGVD97vnCtNnJRM+xqML71 fnHOKgmKZ/QQP79bR6UzKfmAG9TxVr+PQv2rm908lsErJTYJNhs0h34Q1DCT05WZNg7B iiVO0nITDFhuFvd2MOfCCwsIsvjbudGYH25PfFRzObti610Yy9L0EhdvbQ9VOhQidxko gWxZkZtYbVoZ1vrrqxktlY4qWd5c0cHTXQReRUu/XCF8qO2EkLgTrJB6M2kT7weOoWxT Pbmw== MIME-Version: 1.0 X-Received: by 10.182.1.202 with SMTP id 10mr15181047obo.56.1425742997407; Sat, 07 Mar 2015 07:43:17 -0800 (PST) Received: by 10.202.51.66 with HTTP; Sat, 7 Mar 2015 07:43:17 -0800 (PST) In-Reply-To: <75DD1E1D-9E6E-41FB-9C6D-0F1DD36F5068@gmail.com> References: <75DD1E1D-9E6E-41FB-9C6D-0F1DD36F5068@gmail.com> Date: Sat, 7 Mar 2015 07:43:17 -0800 Message-ID: From: Dave Taht To: Rich Brown Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: bloat Subject: Re: [Bloat] tsiox almost gets fixing bufferbloat right on reddit X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 07 Mar 2015 15:43:47 -0000 On Sat, Mar 7, 2015 at 7:09 AM, Rich Brown wrote: > It seems that tsiox (on Reddit) is advocating that people invert the usua= l shotgun approach of guessing which QoS policies to implement, and instead= use the following steps if "the network is slow": > > - The first line of defense is minimizing queues in the bottleneck router= s. Using fq_codel, pie, or other traffic shaping policy really makes a huge= difference without spending time on configuration. > > - After the traffic shaping is in place, measure the traffic responsivene= ss. If you can tell that the traffic shapers aren't quite doing the trick, = then implement QoS, but only for the critical traffic that needs prioritiza= tion. > > - And of course, you may actually need more bandwidth. (The example in th= e Reddit thread of 100 video feeds at 1Mbps - you're going to *require* a 1= 00 Mbps feed. No amount of queue management, prioritization, etc. will help= .) > > Questions: > > - Is this a good policy, properly stated? I agree with your description above, however, based on his prior experience with FQ technologies, he is recomending very short queues used with sch_fq in his example script, and then documenting that people's tcps didn't work as well as they could. All he needs to do is change one line in the scripts he is distributing to his customers to use fq_codel, and I think he'd be golden. > - Is it something we should espouse on the Bloat/CeroWrt sites? Well.... > > Rich > > > On Mar 7, 2015, at 8:26 AM, Dave Taht wrote: > >> I am nervous about applying sch_fq in this scenario rather than >> fq_codel but it is late - and honestly I have never tried what he >> suggests, can't remember my handle on reddit, and the guy otherwise >> gets it, in multiple postings on reddit elsewhere. >> >> http://www.reddit.com/r/networking/comments/2xm5gs/qos_policy/ >> >> Can I ask that someone else monitor reddit, and chat with this guy, so >> I don't have to? >> >> -- >> Dave T=C3=A4ht >> Let's make wifi fast, less jittery and reliable again! >> >> https://plus.google.com/u/0/107942175615993706558/posts/TVX3o84jjmb >> _______________________________________________ >> Bloat mailing list >> Bloat@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/bloat > --=20 Dave T=C3=A4ht Let's make wifi fast, less jittery and reliable again! https://plus.google.com/u/0/107942175615993706558/posts/TVX3o84jjmb