Some IA64 systems have broken firmware that do not
behave correctly when using CONFIG_IA64_PAL_IDLE. It
must be disabled.
We should probably depend on !CONFIG_IA64_PAL_IDLE.
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This is an issue with the firmware, not with us.
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On some firmware versions, there is a problem with
the idle loop goes into low power mode via a PAL call.
Some events are frozen while others keep on counting
which results is inconsistent results. More recent
versions of the kernel have a workaround when perfmon
or Oprofile is active.
Basically, the machine does not call into PAL as soon as a
perfmon context is being attached to a thread or processor.
I think this work around is in RHEL4/SLES9. You can look
at arch/ia64/kernel/process.c and for symbol
On other kernels, you may either:
- and the boot cmdline pass the "nohalt" option
- recompile kernel without CONFIG_IA64_PAL_IDLE disabled
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