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

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Date:	Sat, 20 Sep 2008 14:18:48 -0700
From:	"Steven Noonan" <steven@...inklabs.net>
To:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
Cc:	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>,
	"Luis Rodriguez" <Luis.Rodriguez@...eros.com>,
	"Ingo Molnar" <mingo@...e.hu>
Subject: Re: [ath9k-devel] ath9k: massive unexplained latency in 2.6.27 (rc5, rc6, probably others)

On Sat, Sep 20, 2008 at 1:57 PM, Luis R. Rodriguez
<lrodriguez@...eros.com> wrote:
> So here's what we need to do -- try to zero on in what causes this IRQ
> storm.

How is the best way to approach this? I assume ATH_DBG_INTERRUPT and
pray like hell my /var partition doesn't fill up first? Maybe I'll
just symlink /var/log/messages to a file on a substantially larger
pattition...

> Most likely its some strange event that triggers it, perhaps
> some sort of noise which makes the device try to adapt and hits a path
> we are not handling correctly yet. Can you provide the initial log of
> when ath9k gets loaded? This tells us what card it is, like AR5416 or
> AR9280, etc.

[10238.347956] ath9k: 0.1
[10238.348028] vendor=8086 device=27d2
[10238.348033] ath9k 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[10238.348050] ath9k 0000:03:00.0: setting latency timer to 64
[10238.480781] phy1: Selected rate control algorithm 'ath9k_rate_control'
[10238.483320] phy1: Atheros 5416: mem=0xffffc20000060000, irq=17

It claims to be a 5416, but I was under the impression that it was the
5418 that came with the MacBook Pro.
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