[Bug 196650] [PATCH] Display progress during getmemsize() so the kernel doesn't look like it hanged

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196650

            Bug ID: 196650
           Summary: [PATCH] Display progress during getmemsize() so the
                    kernel doesn't look like it hanged
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rpokala at panasas.com

Several people have noticed that there can be a long, silent pause early in
boot on amd64 systems with large amounts of physical RAM. This is while all the
memory ranges are getting mapped in. Even with the memory tests disabled, this
can take a noticeably long time, to the point that its easy to think that the
kernel has stopped booting. The attached patch provides a basic progress
indicator (print a dot as every GB is mapped), so it is obvious that progress
actually is being made.

Environment:
FreeBSD 11.0-CURRENT

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