linux-kernel - Re: [PATCH 1/1] ath5k: fix hw rate index condition

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Message-ID: <20090331122348.GA31324@hash.localnet>
Date:	Tue, 31 Mar 2009 08:23:48 -0400
From:	Bob Copeland <me@...copeland.com>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	Dhaval Giani <dhaval.lists@...gianis.in>,
	linville@...driver.com, davem@...emloft.net,
	linux-wireless@...r.kernel.org, ath5k-devel@...ema.h4ckr.net,
	Nick Kossifidis <mickflemm@...il.com>,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ath5k: fix hw rate index condition

On Tue, Mar 31, 2009 at 09:21:40AM +0530, Dhaval Giani wrote:
> Am not sure what the PID controller is, and google gave me a number of
> results, which did not make too much sense in the context.

CONFIG_MAC80211_RC_PID -- unfortunately I recall having to jump through
a few config hoops to enable it.

> One way I have found of reproducing it is to connect to open networks,
> but it does not happen always. At home, when my network is set to open,
> I do not see this issue, whereas at the airport, kaboom.

Ok - that is a useful data point.  Perhaps something to do with the rates
the peer supports; it would help if you could grab a scan next time you
are in the area.  Turn off auto-connect to open networks, then do:

 # iw dev wlan0 scan trigger
 # iw dev wlan0 scan dump >> dump.out    # do this a few times

Then if a particular peer triggers the problem, we can look at the 
advertised rates to see if anything jumps out.

-- 
Bob Copeland %% www.bobcopeland.com

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