From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-1?Q?Torquil_Macdonald_S=F8rensen?= Date: Fri, 20 Aug 2010 01:43:31 +0200 Subject: [ath9k-devel] AR9285: Possible intermittent connection drop-outs In-Reply-To: References: <4C6AB479.2010603@gmail.com> Message-ID: <4C6DC1A3.9080309@gmail.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 19/08/10 03:22, Adrian Chadd wrote: > So there's plenty of things you can vary given the current setup to > try and eliminate things. > > * Can you buy one of those dlink units for testing? (ie, so your > testing doesn't interfere with others) > * Is it 11a, 11b, 11bg, 11n? 2.4 or 5ghz? It may be linked to the > underlying media you're using > * The OP is using WPA2. It may be related to crypto key management > * It may be related to other people using the unit, and/or spectrum > * It may be related to the channel you're using (eg, the AR5416 I have > here goes into a "stuck beacon" loop in hostap mode if I run it on > channel 11, but channels 1 and 6 are fine.) > * It may be occuring when the unit/client changes channel (if you're > roaming about, and/or the AP dynamically changes channel.) > > Some of these overlap (eg if you change channel, you are changing how > the radio is setup but you're also changing how your AP behaves and > possibly changing the RF environment - what other clients/APs/RF noise > are on those channels.) So make up a diagram of the above, figure out > what internal/external factors you think can contribute, and then look > at varying one at a time. > > As a developer (and as one who has debugged a few of these wireless > issues lately!) the worst thing you can be told is "it doesn't work > right." It may take some time, but narrowing down a specific, > controllable instance showing the deviation in behaviour is going to > help the ath9k developers get a potential clue where to look and what > debugging to turn on. > > 2c, > > Adrian Thanks Adrian! This is very useful information, I'll make sure to study it in detail. It is 2.432GHz. I have chosen "11b/g" on the router, intensionally disabling 11n since there are other bottlenecks in the system. I'm pretty sure that I'm using 11g. I don't seem to have experienced the problem (at least not as noticeable) in the last couple of days. Lately I have started to compile my own kernels, and in the process turned off a lot of unecessary kernel compile options. Btw, I know that there are no kernel log messages when the problems occurs. That's partly why i have been compiling my own kernels, in order to activate the ath9k debugging. Torquil