linux-kernel - Re: NOHZ: local_softirq

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Message-ID: <1338450985.2760.1270.camel@edumazet-glaptop>
Date:	Thu, 31 May 2012 09:56:25 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: NOHZ: local_softirq_pending 08

On Thu, 2012-05-31 at 09:52 +0200, Thomas Gleixner wrote:
> 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 :)

It might be a bug in the network driver, a race with NAPI completion.

Dave, which net drivers run on these machines ?


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