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SubjectRe: NMI problems with Dell SMP Xeons

> Two ways:
> (1) Boot with a kernel with CONFIG_ACPI=n, so the OS only finds 2 cpus
> in the MPT instead of the 4 listed by ACPI.
> (2) The kernel has ACPI=y, but is booted with maxcpus=2.
> In both cases, send_IPI_allbutself() with IPI 2 or an NMI will result
> in a hard reset.

Sounds both like a "Don't do that when it hurts" . I know some people
have religious issues with ACPI, but it's simple a fact that many
modern boxes don't work correctly in obvious or subtle ways without it.

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