linux-kernel - Re: 3.4-rc2, ilwagn still most of the time completely unusable

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Date:	Thu, 12 Apr 2012 09:02:02 +0900
From:	Norbert Preining <preining@...ic.at>
To:	"Venkataraman, Meenakshi" <meenakshi.venkataraman@...el.com>
Cc:	Emmanuel Grumbach <egrumbach@...il.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ipw3945-devel@...ts.sourceforge.net" 
	<ipw3945-devel@...ts.sourceforge.net>,
	"ilw@...ux.intel.com" <ilw@...ux.intel.com>
Subject: Re: 3.4-rc2, ilwagn still most of the time completely unusable

Hi Meenakshi,

thanks for your email

On Mi, 11 Apr 2012, Venkataraman, Meenakshi wrote:
> Sorry about the annoyance it is causing you...but let's see if we can solve the problems you're seeing.

Yes, let us make another trial ;-)

> >	delba from 00:0a:79:eb:56:10 (initiator) tid 0 reason code 39
> >	Rx BA session stop requested for ...
> >*IF* it is connected.
> 
> [MV]  This is actually printed by mac80211 when it stops a block ack session; which can happen with bursty traffic. It's not an error per se. You'll see this message if you have debugging enabled for mac80211, specifically CONFIG_MAC80211_HT_DEBUG. Perhaps you could reduce the debugging information you print out for mac80211?

Probably I was asked to activate that at some point ;-) Will disactivate
it. Thanks.

> >On the contrary, it sometimes not even connects, after reloading the module,
> >retrying many times, today my log was smarmed with messages:
> >	[ 9457.156030] wlan0: authentication with 00:24:c4:ab:bd:e0 timed out
> >	[ 9457.176828] iwlwifi 0000:06:00.0: ACTIVATE a non DRIVER active
> >station id 0 addr 00:24:c4:ab:bd:e0
> 
> [MV]  this could potentially be a problem with our driver. I would like some logs to figure out what happened here. Can you send me a detailed dmesg log with debug=0xFFFFFFFF?  Thanks. :-)

I will do when I am back at university.

> >But I want to report *SOME* progress: Formerly I had *BIG* problems with
> >my home network (some strange Corega WL router AFAIR, Japanese only, but
> >it was working without a click before 2.6.38 or 39 or so).
> >Now, when I *DISABLE* 11n (11n_disable=1) then all the problems are gone
> >*AT*HOME*, no warnings anymore, no complains, no hickups.
> >On the university it is still a pain.
> 
> [MV] Any idea how 11n is performing with 3.4-rc2 on your home network? Are you seeing the same problems as before?

On the university often no connection at all.
At home: connection hangs for several seconds, when I look at the 
ping www.kernel.org I have more than 20% packet loss. And interestingly
quite often the ping looks like:
64 bytes from pub1.kernel.org (149.20.20.133): icmp_req=131 ttl=53 time=125 ms
64 bytes from pub1.kernel.org (149.20.20.133): icmp_req=133 ttl=53 time=124 ms
64 bytes from 149.20.20.133: icmp_req=134 ttl=53 time=135 ms
64 bytes from pub1.kernel.org (149.20.20.133): icmp_req=135 ttl=53 time=123 ms
64 bytes from pub1.kernel.org (149.20.20.133): icmp_req=136 ttl=53 time=121 ms
which does NOT relate in anyway to my feeling, because when I 
check the *real* time *before* the line
	64 bytes from 149.20.20.133: icmp_req=134 ttl=53 time=135 ms
there are *several* seconds, (3-4, sometimes more) of waiting time.

That of course destroys regularly every ssh and ftp connection.
http is of course not the problem (but who cares for the web?).

I have create a log with the above debug settings but 11n NOT disabled.
I also added some
	===== remarks =======
(variable number of =, tough, but at least always 4, so you can search
for ====) with logger "....". The log is *BIG*, compressed 3Mb, you
can find it here:
	http://www.logic.at/people/preining/syslog.bz2

Ok, when I have something from the university I will let you know.

Best wishes

Norbert
------------------------------------------------------------------------
Norbert Preining            preining@...ist.ac.jp, logic.at, debian.org}
JAIST, Japan                                 TeX Live & Debian Developer
DSA: 0x09C5B094   fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
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