2000-12-12 18:08:57

by Mikael Pettersson

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Subject: [PATCH] local APIC and NMI watchdog on UP P6 systems

An updated version of the UP-APIC patch for Intel P6 processors
is now available at:


The current version is intended for 2.4.0-test12 final.

This version is based on Ingo Molnar's upapic-2.4.0-test9-F8 patch,
with add-on patches from Maciej W. Rozycki and myself. I'm
intending to maintain it until it gets into 2.4 or 2.5.

I've used it since test10-pre and believe it to be safe for
general use, but more testers are welcome.

For those unfamiliar with the patch:
- It enables the local APIC found in most P6 family processors,
even on UP systems which often keep it disabled.
- The NMI watchdog now works on UP systems too. This is interesting
primarily for kernel hackers wishing to debug lockups.
- A properly enabled local APIC is a prerequisite for interrupt-
driven use of the performance-monitoring counters.