linux-kernel - Re: [ath5k-devel] ath5k regression associating with APs in 2.6.38

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Message-ID: <4DE525DB.1000908@openwrt.org>
Date:	Tue, 31 May 2011 19:31:07 +0200
From:	Felix Fietkau <nbd@...nwrt.org>
To:	Nick Kossifidis <mickflemm@...il.com>
CC:	"John W. Linville" <linville@...driver.com>,
	Jiri Slaby <jirislaby@...il.com>,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>,
	Bob Copeland <me@...copeland.com>,
	linux-wireless@...r.kernel.org, ath5k-devel@...ema.h4ckr.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [ath5k-devel] ath5k regression associating with APs in 2.6.38

On 2011-05-17 7:14 PM, Nick Kossifidis wrote:
> 2011/5/17 Seth Forshee<seth.forshee@...onical.com>:
>>  On Mon, May 09, 2011 at 09:02:30AM +0200, Seth Forshee wrote:
>>>  On Thu, May 05, 2011 at 05:30:42PM +0300, Nick Kossifidis wrote:
>>>  >  Hmm I don't see any errors from reset/phy code, can you disable
>>>  >  Network Manager/wpa-supplicant and test connection on an open network
>>>  >  using iw ? It 'll give us a better picture...
>>>  >
>>>  >  If iw doesn't return any scan results we are probably hitting a PHY/RF
>>>  >  error specific to your device (not all vendors follow the reference
>>>  >  design). Maybe we should follow a blacklist/whitelist approach for
>>>  >  this feature.
>>>
>>>  I got the results back from my tester. He was able to get scan results,
>>>  but it took multiple tries and the direct probe failures appear in the
>>>  log. He didn't enable ATH5K_DEBUG_RESET this time; let me know if you
>>>  need that and I'll request he retest with the extra debug logs enabled.
>>
>>  I got some more feedback. Most of the time iw does not get scan results,
>>  but even when it does connecting to the AP isn't always successful. The
>>  tester did note that he doesn't seem to have any trouble if his machine
>>  is within a few feet of his AP. Let me know if you'd like something else
>>  tested.
>>
>>  I noticed that bugzilla #31922 (ath5k: Decreased throughput in IBSS or
>>  802.11n mode) is also fixed by reverting 8aec7af9. It seems like the
>>  synth-only channel changes are resulting in poor connection quality.
>>  Maybe that patch needs to be reverted?
>>
>>  Thanks,
>>  Seth
>>
>>
>
> http://www.kernel.org/pub/linux/kernel/people/mickflemm/01-fast-chan-switch-modparm
Disabling fast channel change also fixed a reproducible crash on 
Broadcom based MIPS boards with some cards (AR2413, I think).

- Felix
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