Messages in this thread | | | Date | Thu, 31 Jul 2003 00:53:00 +0200 (MEST) | From | Mikael Pettersson <> | Subject | Re: [PATCH] NMI watchdog documentation |
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On Wed, 30 Jul 2003 22:40:52 +0300, Ville Herva wrote: >Ok, you got me confused (thankfully I didn't submit anything for inclusion >yet. :) ... >So... Should it be something like: > >+For x86-64, the needed APIC is always compiled in, and the NMI watchdog is >+always enabled with perctr mode. Currently, mode=2 (local APIC) does not
always enabled with I/O-APIC mode.
>+work on x86-64. IO APIC mode (mode=1) is the default. Using NMI watchdog
Using local APIC
>+(mode=1) needs the first performance register, so you can't use it for
(mode=2)
>+other purposes (such as high precision performance profiling.)
>(Is the last sentence only valid for x86-64?)
No, it's true for both x86 and x86-64. However, both oprofile and the perfctr driver disable the local APIC NMI watchdog, so the statement is only true for other drivers that don't do this.
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