[Bug 229429] FIRST_MSI_INT is too low for large core count systems, panic on boot

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229429

            Bug ID: 229429
           Summary: FIRST_MSI_INT is too low for large core count systems,
                    panic on boot
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: kevin at your.org

As mentioned on the freebsd-current list:

https://lists.freebsd.org/pipermail/freebsd-current/2018-April/069203.html

FIRST_MSI_INT is too low for some large systems. Without raising this constant,
the kernel panics on boot unless MSI is disabled.

The original reporter on the mailing list reported success raising it to 512,
my system required raising it higher (768 worked). John Baldwin suggested
making this a dynamically calculated value.

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