From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.toke.dk (mail.toke.dk [IPv6:2a00:7660:6da:2001::664]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 815603CB35 for ; Thu, 8 Aug 2019 16:33:58 -0400 (EDT) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=toke.dk; s=20161023; t=1565296436; bh=abXiEnR7PoQcw6rrKHQ5ZgNN8U4yjlynqk4zSy15gc8=; h=From:To:Subject:In-Reply-To:References:Date:From; b=Xnde778yjnjNTIadBWh45hLfbfTDTYBUYmr8BX4fhz4OWwpXmkJm2nLFMuzkH2Yrh howgshMuybjSNB7o+eZDqsAznK+CaTy7zKmb1YsEfPn1bVlrmLFKkJo2VimScmQqCq TR99Oi2hARQdhp5w+echqamFavG6y8LIvO9bWoUJCWFc/XzVkXDi94nFpwfUA2BXbb k63oSIQcaw5uD8VZEnwnOO2FfuuKV3B7YpLaNtlsCO3BWa/ymhJp7VDfLZHeT9KlJ6 1hV/lxMUxEK8pDCDBUaixDMRL6KhyyMBd4FtB1is3xkBWAHreWr2KHG/gKpUM8n8r+ zAqCFkd++6g4g== To: Mikael Abrahamsson , bloat@lists.bufferbloat.net In-Reply-To: References: Date: Thu, 08 Aug 2019 22:33:55 +0200 X-Clacks-Overhead: GNU Terry Pratchett Message-ID: <87blwzs8gc.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain Subject: Re: [Bloat] weird problem WRT1200 + CAKE on OpenWrt 18.06.2 X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Aug 2019 20:33:58 -0000 Mikael Abrahamsson writes: > Hi, > > I've been running openwrt 18.06.2 for a long time on my WRT1200AC, with > CAKE, and everything has been great. I always got A+ in dslreports for > bufferbloat. I have a 250/100 ETTH connection (IP over ethernet native, no > PPPoE, no PON). > > I noticed some intermittent network stuttering issues I wanted to diagnose > last week, so I started looking into this. When doing the test I get > +100ms spikes in the downstream direction when I run CAKE. If I instead > switch to FQ_CODEL I do not see these spikes. As a matter of fact, if I > set my downstream to 300 when running cake and let my ISP handle the > buffering then I get an average of 5-10ms worth of buffering with no > spikes. My ISP isn't bloated in that direction. Hmm, this seems like it's an issue with the timers CAKE uses for shaping. Not really sure why that would happen... > # tc qdisc show dev eth1.2 > qdisc cake 801f: root refcnt 2 bandwidth 100Mbit diffserv3 triple-isolate nonat nowash no-ack-filter split-gso rtt 100.0ms noatm overhead 22 > qdisc ingress ffff: parent ffff:fff1 ---------------- > > tc qdisc show dev ifb4eth1.2 > qdisc cake 8020: root refcnt 2 bandwidth 240Mbit diffserv3 triple-isolate nonat nowash no-ack-filter split-gso rtt 100.0ms noatm overhead 22 This looks like you're running sqm-scripts on a VLAN interface? Does it make any difference if you run it on the physical eth1? -Toke