this is the latest version of the x86 SMP/APIC/IOAPIC code:
http://www.redhat.com/~mingo/smp-2.3.18-B1
(patch too big to be posted to vger)
This is a major cleanup/rewrite of various components within the APIC and
lowlevel SMP/irq code. This patch might fix some 'notoriously' flaky SMP
boards, and has the potential to break working ones ;) Anyway, i'd like to
ask all adventureous x86 SMP board owners to test out this patch - and
please watch for new weirdnesses, or old, still unfixed weirdnesses. [i'd
like to hear about all problems that are still not fixed by this patch]
Bugs that should be/might be fixed by this patch:
- 'timer irq doesnt work' type of messages should not happen
anymore.
- 'spurious APIC interrupt' messages and related lockups should
not happen anymore.
- flakyness under 'noapic' mode should be fixed.
- IRQ load unevenness between CPUs should not occur anymore.
- IRQ-load related lockups should not happen, or should be
converted to oopses by the NMI-watchdog.
the patch itself works on P5, PII/PIII, UP boxes in various scenarios. It
applies cleanly to all later 2.3 kernels (2.3.17/18, 2.3.18-ac1-6).
(Alan, please dont apply this patch yet, i'd first like to get some
feedback on it.)
the Changelog:
- unconditional NMI oopser. It turned out that we can do this on
99% (maybe 100%) of x86 SMP boxes without impacting timer IRQ
performance. See Documentation/nmi_watchdog.txt.
(me)
- old external IOAPICs and 486-based SMP boxes should work now
(Maciej W. Rozycki)
- unused variable space cleanups, initialize_secondary() cleanup
(Manfred Spraul)
- moved all IO-APIC and IPI APIC messages to logical destination
mode, fixed LDR initialization bug, cleaned up irq-vector space.
(me)
- 'timer-sync' feature, all CPUs synchronize their time stamp
counters, errors get reported and fixed. This fixes certain
dual-PIII boards.
(me)
- the 'set the destination CPU mask to 0' IOAPIC-edge trick is
actually not valid and triggers APIC bugs. Exchanged it for an
equivalent but safe method.
(me)
- 8259A init moved out of setup.S
(Maciej W. Rozycki)
- spurious 8259A interrupts get reported properly, APIC error
vector exported and logged properly
(me)
- a 'noapic' bug fixed - fixes instability in noapic mode.
(me)
- we can inline ack_APIC() on P6 boxes: smaller and faster IRQ
code.
(me)
- other stuff.
reports, comments, suggestions welcome.
-- mingo
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