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    SubjectRe: NOHZ: local_softirq_pending 08
    On 31/05/12 17:04, Dave Jones wrote:
    > 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.

    Same thing happens here (kernel 3.4.1, also happened with 3.4.0):

    r8169 0000:06:00.0: eth0: link down
    r8169 0000:06:00.0: eth0: link down
    NOHZ: local_softirq_pending 08
    NOHZ: local_softirq_pending 08
    NOHZ: local_softirq_pending 08
    r8169 0000:06:00.0: eth0: link up


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