From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-x232.google.com (mail-ob0-x232.google.com [IPv6:2607:f8b0:4003:c01::232]) (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 3DC9721F1A1 for ; Tue, 19 May 2015 15:37:38 -0700 (PDT) Received: by obblk2 with SMTP id lk2so23798803obb.0 for ; Tue, 19 May 2015 15:37:32 -0700 (PDT) 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 :content-type:content-transfer-encoding; bh=FwEWZnRY7z5TLHJEF94/YCpb90lKozlBLZikQXz9OGg=; b=Dx/T9rQx7caehd3Vqw56Rru8A+cA8Abdjjamr5RJqluq9sEeWPbZpcu76krWGZnlCG rn0qyRu+D527NeFRvo8u38vNoZdHR8qUrqOyjlcJVI8em4SkWV4drqIzjM467WE/k7LE WN6MO7lALMhA3Keb+7UnkxHWjwEf1wzhbN/OhoUrBPJyInBsLl1jl5Aal/Eqfsu2lo9w prt8v8DxRkYVy5m5+9TPHb9GwJZBdvuOknICBcceMFhj0VGfsGrNxXHO5ykqfxFddHqE oOG8L8Xj+HZX9byMy/HJugxxTjX/dzFCnvOEPlGjDvAkK+QnUEViHEKaUNmdL+38SWjl u8tA== MIME-Version: 1.0 X-Received: by 10.202.71.84 with SMTP id u81mr1547531oia.81.1432075052581; Tue, 19 May 2015 15:37:32 -0700 (PDT) Received: by 10.202.105.146 with HTTP; Tue, 19 May 2015 15:37:32 -0700 (PDT) In-Reply-To: References: Date: Tue, 19 May 2015 15:37:32 -0700 Message-ID: From: Dave Taht To: bloat Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Subject: [Bloat] Fwd: dslreports and inbound rate shaping 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: Tue, 19 May 2015 22:38:24 -0000 resending as the mail server seems to be mis-behaving. ---------- Forwarded message ---------- From: Dave Taht Date: Tue, May 19, 2015 at 12:17 PM Subject: dslreports and inbound rate shaping To: bloat , Justin Beech , cake@lists.bufferbloat.net 0) dslreports has a hires bufferbloat option now in their settings. It reveals much detail that I like very much. It may not work well on some browsers. Give it a shot, please. 1) I like that the graphic .png reports now a ping range, but I think that is baseline latencies. but I think it would be clearer if it showed the up and the down, under load, 98th percentile, also. an unshaped, unmodified cable modem result in all it's horrible glory: http://www.dslreports.com/speedtest/506793 I am puzzled as to why the idle portion of the test is so bad. Perhaps it it measuring a new flow syn/synack/data? Or there is a need for the lowat option on the server side so as to end the test more quickly? or have we lost so badly there are still 10 seconds of data in flight?? (will take apart some captures when I have time) 2) the "cable" test (which keeps changing the number of flows - these are all 16/6 flows) thoroughly breaks the sqm system's inbound rate shaper, using cake or fq_codel (cake here), with my rate set 12% below the delivered rate (100mbit vs 112Mbit). http://www.dslreports.com/speedtest/509743 fq_codel: http://www.dslreports.com/speedtest/509763 Pie: http://www.dslreports.com/speedtest/509736 Desperate, I applied the linux policer to the inbound test, and got huge reductions in latency, still with big bursts at a huge cost in bandwidth. http://www.dslreports.com/speedtest/506807 We have done too much testing with the gentler rrul test, and this explains a lot about some bittorrent results I have got elsewhere. So I finished writing up my thoughts on bobbie, http://www.bufferbloat.net/projects/codel/wiki/Bobbie which might work better than anything on the table in the face of huge bursts like these, when the rate differential is so small. 3) I will try to add a few dslreports emulations into the netperf-wrapper s= uite. Sigh. Still so much work left to perform on bufferbloat on conventional dev= ices. I think fixing wifi will be harder than this. Building spacecraft is easier than this. -- Dave T=C3=A4ht Open Networking needs **Open Source Hardware** https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67 --=20 Dave T=C3=A4ht Open Networking needs **Open Source Hardware** https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67