Messages in this thread |  | | Date | Thu, 7 Dec 2000 19:29:58 +0100 | From | Andi Kleen <> | Subject | Re: Why is double_fault serviced by a trap gate? |
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On Thu, Dec 07, 2000 at 07:11:57PM +0100, Maciej W. Rozycki wrote: > On Thu, 7 Dec 2000, Andi Kleen wrote: > > > How often does the NMI watchdog handler run ? > > HZ times per second.
Interesting. One of my ports references for PCs lists
0044 r/w PIT counter 3 (PS/2, EISA) used as fail-safe timer. generates an NMI on time out. for user generated NMI see at 0462.
I don't know if modern PCs still provide this counter, but if yes it could be used for a slow NMI watchdog that only runs every 30s or so.
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