[Bug 208068] physical memory based tunables can exhaust KVA

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208068

            Bug ID: 208068
           Summary: physical memory based tunables can exhaust KVA
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jhibbits at FreeBSD.org

Tunables scaled against physical memory can exhaust KVA on large-memory 32-bit
systems (PAE-style), causing early boot panics.

One possible solution would be to scale static allocations(based on maxusers)
against KVA rather than physmem.

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