Messages in this thread | | | Date | Wed, 3 Mar 2004 21:30:33 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] nmi_watchdog=2 and P4-HT |
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Philippe Elie <phil.el@wanadoo.fr> wrote: > > Hi, > > Actually with nmi_watchdog=2 and a P4 ht box the nmi is reflected > only on logical processor 0, it's better to get it on both.
What do you mean by "reflected"? That the NMi is delivered to both siblings but only appears in /proc/interrupts as being delivered to the zeroeth?
> Note, if you test this patch, than on all x86 SMP and nmi_watchdog=2 > nmi occurs at 1000 hz (if the cpu is loaded) not at the intended 1 hz > rate but that's a distinct problem.
nmi_watchdog=2 is local apic, and nmi_watchdog=1 is I/O apic, is that correct?
I am showing the current behaviour:
nmi_watchdog=1: 1000 NMI/second, accounted to both siblings nmi_watchdog=2: one NMI/second, accounted to sibling 0 only.
with your patch:
nmi_watchdog=1: 1000 NMI/second, accounted to both siblings nmi_watchdog=2: 1000 NMI/second, accounted to both siblings
All of these are wrong, aren't they? We'd like to see one NMI per second, on all siblings. I gues that's not possible for the IO APIC?
From the above it appears that you have a solution planned for the local APIC at least, yes? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@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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