From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail2.candelatech.com ([208.74.158.173]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XAey3-0004zA-R0 for ath10k@lists.infradead.org; Fri, 25 Jul 2014 12:51:24 +0000 Message-ID: <53D252B4.9070704@candelatech.com> Date: Fri, 25 Jul 2014 05:51:00 -0700 From: Ben Greear MIME-Version: 1.0 Subject: Re: RE : RE : Trouble shooting low rate MCS9 in 802.11ac References: <30258C2D-7A80-42C1-8AE7-713C490ABF05@st-andrews.ac.uk> <53C6A1C7.5060004@intec.ugent.be> , , In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "ath10k" Errors-To: ath10k-bounces+kvalo=adurom.com@lists.infradead.org To: Vu Hai NGUYEN , Adrian Chadd Cc: Patrick CARNEIRO RODRIGUEZ , "ath10k@lists.infradead.org" , Bartosz Markowski On 07/25/2014 05:22 AM, Vu Hai NGUYEN wrote: >>>> So probably the air condition you have forces the rate control to pick >>>> MCS7 as the most suitable rates. > >>> What could I do to improve this? (Change the air conditioner LOL?) > >> Heh, he meant the RF environment in the location you are. :) >> And ugh - this is why we need an open source ART already. > > My 2 devices have an ARM processor 1200MHz. > If I connect these two devices by an Ethernet cable and doing iperf (in TCP) > I can obtain 880 Mbps, it means that my processor can deal with that speed > of data transfer. But if I use Wi-fi instead of Ethernet to test rate between these > devices, my processor is exhausted, I run command top and see that 0~1% > idle only, ksoftirqd and kworker take most of my processor resource. > > Last week I discovered by chance that the module loaded in kernel can create > effects to performance of rate, in my case it is "iptables". If I unload all module > that related to iptables I can improve the performance. > So I wonder if I can do some thing with the Wi-fi driver to improve rate? > Or the only solution is overclock/change my processor? Can you run 'perf top' on your system when it is under load so we can see where the CPU is being used the most? Thanks, Ben > > NGUYEN Vu Hai > Acita-Sodielec > Route de Mayres - B.P. 9 > 12100 St GEORGES DE LUZENCON > FRANCE > > > > > _______________________________________________ > ath10k mailing list > ath10k@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/ath10k > -- Ben Greear Candela Technologies Inc http://www.candelatech.com _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k