linux-kernel - Re: NOHZ: local_softirq

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Message-ID: <a8e1da0910110355xd47767djaabb653e46a12efc@mail.gmail.com>
Date:	Sun, 11 Oct 2009 18:55:41 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	linux-wireless <linux-wireless@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: NOHZ: local_softirq_pending 08

On Sun, Oct 11, 2009 at 6:08 PM, Johannes Berg
<johannes@...solutions.net> wrote:
> On Sun, 2009-10-11 at 17:52 +0800, Dave Young wrote:
>
>> With kernel 2.6.32-rc3-00052-g0eca52a I got following KERN_ERR
>> messages just while using firefox:
>>
>> [  130.527399] NOHZ: local_softirq_pending 08
>
>> Any idea? or known issue?
>
> Are you using b43 (or wl12x1)? If so, it's a known issue, but the driver
> was recently left without an active maintainer in a brouhaha about a bug
> fix.

Yes, I'm using b43. I will test the patch you posted in another thread.

>
> Cf. http://thread.gmane.org/gmane.linux.kernel.wireless.general/39440
>
> Absent proof that mac80211 is safe to run with BHs enabled, the correct
> solution is disabling tasklets around the RX function, unlike all the
> proposed patches. However, Michael thinks it's such a bad solution that
> he has refused to implement it. So far, nobody has bothered to fix the
> drivers.
>
> FWIW, I believe the bug to be in b43 and wl12x1, and not as Michael
> thinks in the stack.
>
> johannes
>
>



-- 
Regards
dave
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