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 bufpages(5)                                                     bufpages(5)
                          Tunable Kernel Parameters

 NAME    [Toc]    [Back]
      bufpages, nbuf, bufcache_max_pct - TO BE OBSOLETED

 DESCRIPTION    [Toc]    [Back]
      These tunables, traditionally used for sizing a static buffer cache,
      are deprecated.  The recommended way to configure a static buffer
      cache is to set the tunables dbc_min_pct and dbc_max_pct to the same
      value.  Please refer to dbc_min_pct(5) and dbc_max_pct(5), or consult
      HP support for more information.

      Note that bufpages and nbuf were specified in units of 4K physical
      pages, and dbc_min_pct and dbc_max_pct are specified in units of
      percentage of physical memory.

 EXAMPLES    [Toc]    [Back]
      If you have a system with 1GB memory (1048676 KB), and you used to
      tune your buffer cache with bufpages=8000 (8000 4K pages), you can
      determine what is the equivalent percentage of physical memory that
      your buffer cache is using:

       ((8000 * 4)* 100) / 1048576

      This is roughly 3% of physical memory.  Therefore you can tune your
      system to use a static buffer cache of the equivalent size by setting
      both dbc_min_pct and dbc_max_pct to 3:

       # kctune dbc_min_pct=3 dbc_max_pct=3

 WARNINGS    [Toc]    [Back]
      All HP-UX kernel tunable parameters are release specific. These
      parameters (bufpages, nbuf, and bufcache_max_pct) will be removed in a
      future release of HP-UX.

      Installation of optional kernel software, from HP or other vendors,
      may cause changes to tunable parameter values.  After installation,
      some tunable parameters may no longer be at the default or recommended
      values.  For information about the effects of installation on tunable
      values, consult the documentation for the kernel software being
      installed. For information about optional kernel software that was
      factory installed on your system, see HP-UX Release Notes at

 AUTHOR    [Toc]    [Back]
      bufpages, nbuf, and bufcache_max_pct were developed by HP.

 SEE ALSO    [Toc]    [Back]
      dbc_min_pct(5), dbc_max_pct(5).

 Hewlett-Packard Company            - 1 -      HP-UX 11i Version 2: Sep 2004
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