Messages in this thread | | | Subject | Re: Linux 2.6.21-rc1 | From | Thomas Gleixner <> | Date | Wed, 21 Feb 2007 18:07:44 +0100 |
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On Wed, 2007-02-21 at 08:24 -0800, Daniel Walker wrote: > > The most interesting core change may be the dyntick/nohz one, where timer > > ticks will only happen when needed. It's been brewing for a _loong_ time, > > but it's in the standard kernel now as an option. > > On i386 I get the following, > > TCP cubic registered > NET: Registered protocol family 1 > NET: Registered protocol family 17 > Testing NMI watchdog ... CPU#0: NMI appears to be stuck (24->24)! > CPU#1: NMI appears to be stuck (0->0)! > CPU#2: NMI appears to be stuck (0->0)! > CPU#3: NMI appears to be stuck (0->0)! > > when I add nmi_watchdog=1 to my boot args which worked on prior kernels. > On closer inspection it looks like arch/i386/kernel/io_apic.c : > check_timer() --> timer_irq_works() depends on IRQ0 incrementing jiffies > which is no longer the case AFAIK.
At this point the PIT / HPET _is_ active and incrementing jiffies. The switch to local apic timers happens afterwards.
> I'm not sure exactly how that relates to the NMI, but the check_timer() > function disabled the NMI through the io-apic if it can't get the > "timer" working through the io-apic.
Boot log please.
tglx
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