Re: NOHZ: local_softirq_pending 08

[Eric Dumazet]

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 ?


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/