linux-kernel - Re: NOHZ: local_softirq

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Date:	Thu, 31 May 2012 09:52:45 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Jones <davej@...hat.com>
cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: NOHZ: local_softirq_pending 08

Dave,

On Wed, 30 May 2012, Dave Jones wrote:

> May 30 17:43:04 [ 1095.335659] NOHZ: local_softirq_pending 08
> 
> According to git, you ratelimited this back in 2007 with the message
> "until we found the root cause of that problem."
> 
> Is this an old problem that has returned ?

Looks like.
 
> Maybe interesting note: Both machines I see this on regularly are Atom cpus,
> and it's always '08'.

So it goes idle with NET_RX softirq pending. That really should not
happen. I fear you need to fire up the tracer :)

Thanks,

	tglx
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