From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-x22b.google.com (mail-pa0-x22b.google.com [IPv6:2607:f8b0:400e:c03::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 3F2EF3B260; Thu, 5 May 2016 15:23:30 -0400 (EDT) Received: by mail-pa0-x22b.google.com with SMTP id xk12so39261182pac.0; Thu, 05 May 2016 12:23:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:subject:from:to:cc:date:in-reply-to:references :mime-version:content-transfer-encoding; bh=Iigj0LTvJps9sJIvl8vMggjCTADJ/6q2J+fSdesxMm0=; b=rsEZhqM+p0T236PBRvyjt+ScwfbbQoxQBAMeT4thTWabI6DmJ/ZN8IYinXMC1JVe+c r1B5c3uBBPKJAB7h4Ga7MG5P/qUPhF5CBj5LXNl+ffJeEf3rl+0dohAjlnT/zjbexC6T AtlAnG+EekAYca3KWZVPyEHNIK0KSJcGJaeXxnvKLi+ph9vItsM/ccOWn7WZVUKKUEWO wxLoOsagx+Pu3K8TZ8gMOTbDDGR0JXOFL00ER/p/gSyAiVHQkPI2BPjOtjyOEuGwNZoI 7MgzZtD1kYJS2IlLwWMVf2vOO/sl6TXMVqKVUYHqDwV18Za/fe22/UVuji8XJuwpigW/ oILw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:subject:from:to:cc:date:in-reply-to :references:mime-version:content-transfer-encoding; bh=Iigj0LTvJps9sJIvl8vMggjCTADJ/6q2J+fSdesxMm0=; b=K5tLnVXYsDbobzOQUyIWVqjFUBWQOhS0RTLh/4E893qK4k6fQKgLH+mubrqufduSC4 LAIx2WsYnIxLrxw0EekRFqXVnY/seFWRuAjf2O8srz9OxxuFTQR6dMNolzOT64u0pSKP WUXU6xsjyI6zfiOUXcqna5cYigibVftCTp4gNxApOY54V3x/syXAmPZeJwGE94G6FB+n OtuDlCxZnXHE29B6eh9BPqXMU4pEkh6vW/MNvZQtcdPWdERNQuWgzdXu/fRFiKxMmU/b IQOqv7Oas80Flib/O0NZwjTucdcEdJYoxz1X7pa8eJzAozK6/J9vxETFJFAKDCXkfJLz UGyw== X-Gm-Message-State: AOPr4FX1233gCZ13Mltr+4o4fIbZM0p5e5JYHykUV1dG6Dul/QFctVQXW8lu/mkmqUbrcw== X-Received: by 10.66.194.230 with SMTP id hz6mr23192822pac.132.1462476209400; Thu, 05 May 2016 12:23:29 -0700 (PDT) Received: from ?IPv6:2620:0:1000:1704:ad07:4d72:8be8:c271? ([2620:0:1000:1704:ad07:4d72:8be8:c271]) by smtp.googlemail.com with ESMTPSA id e87sm15466208pfb.76.2016.05.05.12.23.27 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 05 May 2016 12:23:28 -0700 (PDT) Message-ID: <1462476207.13075.20.camel@edumazet-glaptop3.roam.corp.google.com> From: Eric Dumazet To: Roman Yeryomin Cc: Jonathan Morton , make-wifi-fast@lists.bufferbloat.net, "codel@lists.bufferbloat.net" , Dave Taht , ath10k Date: Thu, 05 May 2016 12:23:27 -0700 In-Reply-To: References: <1462125592.5535.194.camel@edumazet-glaptop3.roam.corp.google.com> <865DA393-262D-40B6-A9D3-1B978CD5F6C6@gmail.com> <1462128385.5535.200.camel@edumazet-glaptop3.roam.corp.google.com> <1462136140.5535.219.camel@edumazet-glaptop3.roam.corp.google.com> <1462201620.5535.250.camel@edumazet-glaptop3.roam.corp.google.com> <1462205669.5535.254.camel@edumazet-glaptop3.roam.corp.google.com> <1462464776.13075.18.camel@edumazet-glaptop3.roam.corp.google.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4-0ubuntu2 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: Re: [Make-wifi-fast] [Codel] fq_codel_drop vs a udp flood X-BeenThere: make-wifi-fast@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 May 2016 19:23:30 -0000 On Thu, 2016-05-05 at 19:25 +0300, Roman Yeryomin wrote: > On 5 May 2016 at 19:12, Eric Dumazet wrote: > > On Thu, 2016-05-05 at 17:53 +0300, Roman Yeryomin wrote: > > > >> > >> qdisc fq_codel 0: dev eth0 root refcnt 2 limit 1024p flows 1024 > >> quantum 1514 target 5.0ms interval 100.0ms ecn > >> Sent 12306 bytes 128 pkt (dropped 0, overlimits 0 requeues 0) > >> backlog 0b 0p requeues 0 > >> maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0 > >> new_flows_len 0 old_flows_len 0 > > > > > > Limit of 1024 packets and 1024 flows is not wise I think. > > > > (If all buckets are in use, each bucket has a virtual queue of 1 packet, > > which is almost the same than having no queue at all) > > > > I suggest to have at least 8 packets per bucket, to let Codel have a > > chance to trigger. > > > > So you could either reduce number of buckets to 128 (if memory is > > tight), or increase limit to 8192. > > Will try, but what I've posted is default, I didn't change/configure that. fq_codel has a default of 10240 packets and 1024 buckets. http://lxr.free-electrons.com/source/net/sched/sch_fq_codel.c#L413 If someone changed that in the linux variant you use, he probably should explain the rationale.