linux-kernel - Re: [ath9k-devel] ath9k: massive unexplained latency in 2.6.27 (rc5, rc6, probably others)

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Date:	Mon, 22 Sep 2008 00:26:02 -0700
From:	"Steven Noonan" <steven@...inklabs.net>
To:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
Cc:	"Luis Rodriguez" <Luis.Rodriguez@...eros.com>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Senthilkumar Balasubramanian" 
	<Senthilkumar.Balasubramanian@...eros.com>,
	"ath9k-devel@...ts.ath9k.org" <ath9k-devel@...ts.ath9k.org>,
	"Johannes Berg" <johannes@...solutions.net>,
	"Ingo Molnar" <mingo@...e.hu>
Subject: Re: [ath9k-devel] ath9k: massive unexplained latency in 2.6.27 (rc5, rc6, probably others)

On Sun, Sep 21, 2008 at 11:54 PM, Luis R. Rodriguez
<lrodriguez@...eros.com> wrote:
> On Sat, Sep 20, 2008 at 06:48:05PM -0700, Steven Noonan wrote:
>>
>> OK, here's the time index at which it b0rked:
>>
>> 18:28:42          sum   1155.00
>> 18:28:43          sum   1339.00
>> 18:28:44          sum  18355.00
>> 18:28:45          sum  17845.45
>>
>> And the entire log of the minute 18:28 is here:
>> http://www.uplinklabs.net/~tycho/linux/18.28.00-59.log.gz
>>
>> It looks pretty crazy.
>
> Thanks, I'll take a look when I get a chance (remember aggretion
> is in the queue too) unless someone beats me to it.
>

You may want to take a quick look at it now. I certainly don't mean
you should push aggregation aside, but the log looks kind of screwy at
18:28:43 (look at line 4972 to see what I mean). It looks as though it
did printk()s from multiple threads with no locking mechanism. It's
possible I will need to re-capture the error, and I'd like to know if
this log will help or not.

- Steven
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