[Bug 218043] ZFS ARC hit regression

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218043

            Bug ID: 218043
           Summary: ZFS ARC hit regression
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: slw at zxy.spb.ru

After base r307265 (MFC base r305323) ZFS ARC caused regresion for hit ratio of
data and cused about x220 rise of metadata request ratio.

System w/ reverted base r307265:

   ARC demand metadata hits:    27     30     29     29
 ARC demand metadata misses:     0      0      0      0

System w/ applied base r307265:

   ARC demand metadata hits:  6619   6773   6680   6643
 ARC demand metadata misses:     0      0      0      0

I mean requested (and hited) metadata evict data from ZFS and give regression
of data hit ratio.

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