From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-x232.google.com (mail-pa0-x232.google.com [IPv6:2607:f8b0:400e:c03::232]) (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 D2A8C3B260; Thu, 5 May 2016 12:12:58 -0400 (EDT) Received: by mail-pa0-x232.google.com with SMTP id iv1so37397320pac.2; Thu, 05 May 2016 09:12:58 -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=pvtMsN/0x62+RSWAHCpOWVOwK423qC8LZys3PIyRM2Q=; b=VWdCK3c8ASnKkm1EIVUH4iHfVccx4D1uux3WfuwM2bMu9yvPlvix+GU9jKSt7GIUCm EM92shbZ+U//Q/FND//waonGQ4tC92InpbcKc0ze1OektMv9sCiJWoQs6CIxnCVNNBzt SDVsc1QLnzNwiJHKMG3y9hNZu1Ko5dqkUZXf9Sau+DGYb2/oUNi6T1CTqyNIi065UtPq xnOGbhKR/IkL4UU1Rbtqlhonn1cMRgxs7PsjccsRU0NtpoLdXyAcruGnGU4nO9QKiu41 r9jGB+fimWq+leIPd6zokWDfD5i06Q14uLxWOZk0sPXUjZSw3l9ue17/NzW8iV9aYfP0 HtBQ== 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=pvtMsN/0x62+RSWAHCpOWVOwK423qC8LZys3PIyRM2Q=; b=C+af7P3TqxUr68JhOYOsS/k5TekSXypgXlIrxfJoIp3YnxLnXTG+I+gLRgqNTY2Lt7 DGS8VPd9bA1vkXf+pm8uB4zJ5l47kdSFojlWWgXpXlkEXQyE1XyzTpFXq1Yohk4LXWCX ERsYkHoEwgXQdHH1mHkUGjF0Er3v9+fViGlebA9rwtmYFVpu7042X/CtrZjc3WvvIF5f GLOaWVWeeJ/KJsNTb5nl1WCAW0t0oGJXgJnkfw8oYqHjN7MtM67woSZY6upglgqAU9Xb /c9TgJPFet17XeIg4XUxs76KPnCmGT7p/KvDZwxuCFC7PSif6bLQkUnGSxej9k46j7sD JVhw== X-Gm-Message-State: AOPr4FW4pqTuCK0/F+eALpjVZJu1LDEB+vtSG1MZ6Ao0ZK+fVQ7JB5zsv4uVLt7/vuOBnA== X-Received: by 10.66.89.228 with SMTP id br4mr21643386pab.110.1462464778043; Thu, 05 May 2016 09:12:58 -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 e7sm14783559pfa.28.2016.05.05.09.12.56 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 05 May 2016 09:12:57 -0700 (PDT) Message-ID: <1462464776.13075.18.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 09:12:56 -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> 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 16:12:59 -0000 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.