From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from uplift.swm.pp.se (swm.pp.se [212.247.200.143]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 546AA3B29D for ; Sun, 30 Aug 2020 13:27:14 -0400 (EDT) Received: by uplift.swm.pp.se (Postfix, from userid 501) id 27607AF; Sun, 30 Aug 2020 19:27:12 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=swm.pp.se; s=mail; t=1598808432; bh=dD2vOQsmRi+Rfqhc0l1d5/4+TLKmYkAcYy79jIPrvuE=; h=Date:From:To:Subject:From; b=bVEpIsdEbC2v2FOhYb+HHaXl6LujLKSgXY0kaNX/rYeT9AKJ/4UVuM7jHFV5zzYOE ZZHCvhBM0LEtoXFk8oNIrD6uuT/e4vzsCYnJGgBG5+8eCNbzUzwuywnTWifXxydJ6A FqQ5UuHHNG/yQieNYHSH1ozR1zWn91NXV+GaeUVg= Received: from localhost (localhost [127.0.0.1]) by uplift.swm.pp.se (Postfix) with ESMTP id 236239F for ; Sun, 30 Aug 2020 19:27:12 +0200 (CEST) Date: Sun, 30 Aug 2020 19:27:12 +0200 (CEST) From: Mikael Abrahamsson To: bloat@lists.bufferbloat.net Message-ID: User-Agent: Alpine 2.20 (DEB 67 2015-01-07) Organization: People's Front Against WWW MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset=US-ASCII Subject: [Bloat] CAKE in openwrt high CPU 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: Sun, 30 Aug 2020 17:27:14 -0000 Hi, I migrated to an APU2 (https://www.pcengines.ch/apu2.htm) as residential router, from my previous WRT1200AC (marvell armada 385). I was running OpenWrt 18.06 on that one, now I am running latest 19.07.3 on the APU2. Before I had 500/100 and I had to use FQ_CODEL because CAKE took too much CPU to be able to do 500/100 on the WRT1200AC. Now I upgraded to 1000/1000 and tried it again, and even the APU2 can only do CAKE up to ~300 megabit/s. With FQ_CODEL I get full speed (configure 900/900 in SQM in OpenWrt). Looking in top, I see sirq% sitting at 50% pegged. This is typical what I see when CPU based forwarding is maxed out. From my recollection of running CAKE on earlier versions of openwrt (17.x) I don't remember CAKE using more CPU than FQ_CODEL. Anyone know what's up? I'm fine running FQ_CODEL, it solves any bufferbloat but... I thought CAKE supposedly should use less CPU, not more? -- Mikael Abrahamsson email: swmike@swm.pp.se