From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-x229.google.com (mail-ob0-x229.google.com [IPv6:2607:f8b0:4003:c01::229]) (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 E1F5421F279; Thu, 30 Apr 2015 08:17:03 -0700 (PDT) Received: by obcux3 with SMTP id ux3so46597563obc.2; Thu, 30 Apr 2015 08:17:01 -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 :cc:content-type:content-transfer-encoding; bh=jnLt1NYFCB0OPpAEq3BE09+Y5eI3SvBUViSOnKyQkzk=; b=hdD1vOl3/bpdhuKqTTtSOAELPD3Gq2nIOB0Yjhey/NcQuqSrNv2TY5Go1NrlGQ5YJb bIoL5M7mlSdxa9/DuFml9oZn9r6HJkAOvkqv2167sOw9NHqsTp0ZJLfOH29c15HKD7m4 URcMRojli1uBJWy6T78ADEVyyXt4bT4Ti2M0MGoDLnWZ/NPQK+EpfAGo+eaKMnffAmnP RYx9FdfF93E4sDx1JwaVjypsQ7eyEMqYSKmPeg0OQocw4ODRBr24d+rbC1wcZFVW3V4o CIMV1sClekaUP25MmtpYC925s79kmFtNccjwbWF4D3p/Ls3DMCcnIMgrlyWB1NSAfEoP CwBA== MIME-Version: 1.0 X-Received: by 10.182.255.171 with SMTP id ar11mr3930772obd.29.1430407021799; Thu, 30 Apr 2015 08:17:01 -0700 (PDT) Received: by 10.202.71.139 with HTTP; Thu, 30 Apr 2015 08:17:01 -0700 (PDT) In-Reply-To: References: Date: Thu, 30 Apr 2015 08:17:01 -0700 Message-ID: From: Dave Taht To: Jonathan Morton Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: cake@lists.bufferbloat.net, "cerowrt-devel@lists.bufferbloat.net" , bloat Subject: Re: [Cerowrt-devel] [Cake] documentation review request and out of tree cake builds for openwrt/etc. X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 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: Thu, 30 Apr 2015 15:18:20 -0000 On Thu, Apr 30, 2015 at 7:38 AM, Jonathan Morton wr= ote: > It took me a while to get around to thinking about this, partly because m= y > phone inexplicably refuses to believe snapon exists. It has an old dnssec signed dns tree, using the isc dlv, which turned out to somewhat break older versions of dnsmasq, if that helps any. Dire need for some sysadmin help on bufferbloat.net, the cruft has accumula= ted. > I have two possible explanations for these results. Maybe both apply to s= ome > extent. > > Dropping packets rather than marking them results in an increase in ack > density in the reverse direction, because delayed acks get temporarily > disabled. The strength of this effect depends on the BDP and the depth of > delayed acks. Hmm. > > Increasing the number of simultaneous flows might increase the CPU load o= f > connection tracking for NAT. Are you shaping and doing NAT on the same bo= x? > I think this might be the basic reason for increased latency. That particular setup (yurtlab) offloads the NAT to the cable modem. The 110_11Mbit shaping was of course, done on the rangeley. It is possible given the older kernel that perhaps I could be hitting the same power mgmt issue that someone else here ran into earlier, or merely the kernel is weird, or something new like xmit_more is messing up life. I returned to another location (gf) and tested 50mbit down/5mbit up (cerowrt 3.10.50-1 in front of a live cablemodem, same two boxes driving the test) up for much of the past 2 days, and on the same test (rrul starting, then doing the dslreports test) observe expected results, with the download having the normal brief spike, the upload impact being nearly immeasurable, and the observed latency increase in either direction, negligible. http://snapon.lab.bufferbloat.net/~d/dslreports2/dslreports_vs_rrul_50_5mbi= t.png verses the puzzling one: http://snapon.lab.bufferbloat.net/~d/dsl/vsdslreports_at_the_sametime.png So the next step for me is to get cake working in openwrt on hardware fast enough to run at 110Mbit and returning to the yurtlab to try it... but that won't be til sunday at best. Tho I almost got it built, at least, last night. Still sorting through patches.... > > - Jonathan Morton --=20 Dave T=C3=A4ht Open Networking needs **Open Source Hardware** https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67