We have recorded retransmitted IPI's on some boards (notably the
infamous BP6). They do happen. Early 2.4 had a fix for handling the
replay case too, but someone lost it and BP6 boards no longer work as
An IPI can be retried and the retry for dual PII at least seems to hit
all the CPUs. Even on a 2 CPU box this has been observed - I assume
because the error was raised by the IO APIC when it got a garbled IPI.
Go ask Intel if you doubt it.
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