From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Date: Sun, 21 Jul 2013 16:14:35 -0700 Subject: [ath9k-devel] sensitivity control for ath9k with mac80211 In-Reply-To: References: <2DF5040C00EDCD438915E297DC199E9232512664@CVA-MB001.centreville.ads.sparta.com> <51E92EA9.6000202@gmail.com> <51E940D7.1030607@gmail.com> <51E9436E.5060208@candelatech.com> <51E959E8.9010706@openwrt.org> Message-ID: <51EC6B5B.5030400@candelatech.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ath9k-devel@lists.ath9k.org On 07/19/2013 05:53 PM, Sergey Ryazanov wrote: > 2013/7/19 Felix Fietkau : >> On 2013-07-19 4:58 PM, Sergey Ryazanov wrote: >>> 2013/7/19 Ben Greear : >>>> On 07/19/2013 06:36 AM, Flavio Leonel wrote: >>>>> Ok i know that but the command iw not permited set sensitivity limit >>>>> >>>>> how i can seting this limit on atth9k , this question.. >>>> >>>> I tried messing with this some months ago and got nowhere. I could >>>> not figure any way to make the NIC ignore fainter signals, and I am >>>> not sure it is possible to make the hardware do this... >>>> >>> >>> At least 5k chips have a special register for CCA threshold >>> configuration. Modern 9k chips have not inherited this register? >> The CCA threshold is not the same as the threshold for signal detection. >> In many ways, 5k and 9k cards have a somewhat similar set of registers >> to configure various aspects of detection sensitivity. Some of those are >> set in the initvals, some are controlled by ANI. >> The main issue is that the driver does not expose any convenient knobs >> to control this. >> > Yeah. It would be useful for developers to get delicate and operative > control over Tx/Rx process (at least via debugfs). But I never faced > with situations where this would be useful for end user. So, IMHO, > even if somebody submit appropriate patches, they will not be > accepted. I do a lot of testing in cases where there are a few APs with signal level of around -70 to -85, primarily due to not-that-great shielding, as well as APs in surrounding buildings. I'd like to be able to tune a NIC so that it just plain ignored those weak signals to increase throughput with systems with much better signal quality. Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com