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Message-ID: <20120531140432.GC1749@redhat.com> Date: Thu, 31 May 2012 10:04:32 -0400 From: Dave Jones <davej@...hat.com> To: Eric Dumazet <eric.dumazet@...il.com> Cc: Thomas Gleixner <tglx@...utronix.de>, Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: NOHZ: local_softirq_pending 08 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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