Re: NOHZ: local_softirq_pending 08

[Dave Jones <davej@redhat.com>]

On Thu, May 31, 2012 at 09:56:25AM +0200, Eric Dumazet wrote:
 > 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 ?

r8169.

I got an email from someone else asking if I used Realtek drivers, which I thought
was an uncanny guess.

	Dave