Messages in this thread |  | | From | Keith Owens <> | Subject | Re: [patch] enabling APIC and NMI watchdog on UP systems | Date | Fri, 29 Sep 2000 11:35:49 +1100 |
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On Fri, 29 Sep 2000 01:13:06 +0200 (CEST), Ingo Molnar <mingo@elte.hu> wrote: >On Fri, 29 Sep 2000, Keith Owens wrote: >> Using performance counter 1 for NMI conflicts with using the >> performance counters for tuning. IMHO it is better to default to NMI >> off for UP so we do not disturb people who are doing performance >> monitoring. [...] > >the number of people experiencing hard lockups, and the importance of >debugging these (annoying) lockups IMO far outweighs the potential >inconvenience caused by having to disable the NMI oopser for performance >tuning.
I did not want to disturb anybody who was already using the performance counters for tuning so I made NMI for UP optional. You prefer to make NMI for UP mandatory, change the existing behaviour and force people who use performance counters to turn off EVNTSEL1 themselves. And they must remember to reprogram EVNTSEL1 to reactivate NMI after they have finished tuning.
This is a philosophical difference, not a technical one, we will just have to agree to disagree. Either way it will be nice to get NMI for UP into the standard kernel.
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