NOHZ: local_softirq_pending 08
in [Kernel]
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From: Johannes Berg on 11 Oct 2009 18:52 On Sun, 2009-10-11 at 13:18 +0200, Tilman Schmidt wrote: > Can you explain a bit more what that message is about? > I am encountering it in a completely different context > (PPP over ISDN) and I would like to know where to start > looking for the cause and developing a fix. The thread > on linux.kernel.wireless.general only seems to address > the specific situation in the wireless stack. Basically, calling netif_rx() with softirqs enabled. johannes
From: Dave Young on 11 Oct 2009 18:53 On Sun, Oct 11, 2009 at 6:08 PM, Johannes Berg <johannes(a)sipsolutions.net> wrote: > On Sun, 2009-10-11 at 17:52 +0800, Dave Young wrote: > >> With kernel 2.6.32-rc3-00052-g0eca52a I got following KERN_ERR >> messages just while using firefox: >> >> [ 130.527399] NOHZ: local_softirq_pending 08 > >> Any idea? or known issue? > > Are you using b43 (or wl12x1)? If so, it's a known issue, but the driver > was recently left without an active maintainer in a brouhaha about a bug > fix. Yes, I'm using b43. I will test the patch you posted in another thread. > > Cf. http://thread.gmane.org/gmane.linux.kernel.wireless.general/39440 > > Absent proof that mac80211 is safe to run with BHs enabled, the correct > solution is disabling tasklets around the RX function, unlike all the > proposed patches. However, Michael thinks it's such a bad solution that > he has refused to implement it. So far, nobody has bothered to fix the > drivers. > > FWIW, I believe the bug to be in b43 and wl12x1, and not as Michael > thinks in the stack. > > johannes > > -- Regards dave -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: David Miller on 11 Oct 2009 18:53 From: Michael Buesch <mb(a)bu3sch.de> Date: Sun, 11 Oct 2009 12:17:30 +0200 > On Sunday 11 October 2009 12:08:55 Johannes Berg wrote: >> On Sun, 2009-10-11 at 17:52 +0800, Dave Young wrote: >> >> FWIW, I believe the bug to be in b43 and wl12x1, and not as Michael >> thinks in the stack. > > If mac80211 requires BHs disabled, it should do this. That's overhead, and %99 of drivers do not require it, and therefore for %99 of drivers it's unnecessary overhead. In general we avoid doing things like that. Instead, we put the cost only where it's actually needed. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Tilman Schmidt on 11 Oct 2009 18:54 On Sun, 11 Oct 2009 12:08:55 +0200, Johannes Berg wrote: > On Sun, 2009-10-11 at 17:52 +0800, Dave Young wrote: > >> With kernel 2.6.32-rc3-00052-g0eca52a I got following KERN_ERR >> messages just while using firefox: >> >> [ 130.527399] NOHZ: local_softirq_pending 08 > >> Any idea? or known issue? > > Are you using b43 (or wl12x1)? If so, it's a known issue, but the driver > was recently left without an active maintainer in a brouhaha about a bug > fix. > > Cf. http://thread.gmane.org/gmane.linux.kernel.wireless.general/39440 Can you explain a bit more what that message is about? I am encountering it in a completely different context (PPP over ISDN) and I would like to know where to start looking for the cause and developing a fix. The thread on linux.kernel.wireless.general only seems to address the specific situation in the wireless stack. Thanks, Tilman -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.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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