From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bifrost.lang.hm (mail.lang.hm [64.81.33.126]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id E2BBA21F30F for ; Sat, 7 Feb 2015 18:48:58 -0800 (PST) Received: from asgard.lang.hm (asgard.lang.hm [10.0.0.100]) by bifrost.lang.hm (8.13.4/8.13.4/Debian-3) with ESMTP id t182mtaI022865; Sat, 7 Feb 2015 18:48:55 -0800 Date: Sat, 7 Feb 2015 18:48:55 -0800 (PST) From: David Lang X-X-Sender: dlang@asgard.lang.hm To: Dave Taht In-Reply-To: Message-ID: References: User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: "cerowrt-devel@lists.bufferbloat.net" Subject: Re: [Cerowrt-devel] what stats do people want from conference wifi? 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: Sun, 08 Feb 2015 02:49:27 -0000 when you say "fairly frequently", is per minute reasonable? David Lang On Sun, 8 Feb 2015, Dave Taht wrote: > I am very interested in per sta stats - rc_stats - captured fairly > frequently - timestamped and kept on per mac order.. > > cat /sys/kernel/debug/ieee80211/phy*/netdev:*/stations/*/rc_stats > > you might also get a good grip on simultaneous users and on user > migration by using this. > > also I have found the xmit stat to be useful. > > > > > On Sun, Feb 8, 2015 at 3:02 PM, David Lang wrote: >> In the next few days I'm going to be building the openwrt images to use at >> the SCaLE conference. I will have ~50 APs deployed supporting ~3k attendees. >> This will be running on WNDR3700v2 and WNDR3800 APs. Since I am compiling >> the firmware myself, I can add in patches to gather and log stats for things >> that are not normally reported >> >> The wireless network architecture is: >> >> separate ESSIDs for 2.4 vs 5. >> each band gets bridged to a different VLAN >> the APs are configured not to forward broadcast traffic from one wireless >> client to another on the same AP (although broadcast traffic from one AP >> probably goes out others after hitting the wire now that I think about it) >> I have all logs from the APs sent to a central logserver >> I have use rrdtool to catpture normal bandwith/cpu/etc stats >> I also have rrdtool capture how many clients are connected to each ESSID >> every minute. >> >> >> What else can I gather related to the wifi? >> >> I think it would be useful if we could gather info along the lines of >> >> amount of airtime used >> >> how much latency is added to packets while waiting to transmit because it's >> hearing something else transmit? >> >> amount of unused airtime available >> >> average effective bit rate >> >> percentage of time spent doing broadcasts (things required to operate at the >> lowest bit rate) >> >> >> >> >> Part of the reason that I compile my own firmware images is that I >> completely disable connection tracking in the kernel (because clients may >> move from one AP to another in the middle of a connection it's a waste of >> cpu and memory to track), and as a result of these optimizations, there is >> actually quite a bit of CPU available. The boxes almost never hit 20% cpu >> utilization, so there's quite a bit available to gather other stats. >> >> some of the stats I gather are in messages spit out by the kernel, others >> from scrips running on the box querying things in /proc or /sys, and others >> from watching logs and summarizing them once a minute. I even have a process >> that goes threough all the connection logs for the duration of the show and >> graph how many unique MAC addresses we've seen and a breakdown into the >> different vendor prefixes. If there's a way to get the data, I can support >> it. >> >> If there are fq_codel stats that people would find interesting in this >> environment, I can gather those as well (both on the APs and on the Debian >> based firewall/gateway) >> >> David Lang >> _______________________________________________ >> Cerowrt-devel mailing list >> Cerowrt-devel@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/cerowrt-devel > > > >