NAME
bufpages, nbuf, bufcache_max_pct — TO BE OBSOLETED
DESCRIPTION
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
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
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
http://docs.hp.com.
AUTHOR
bufpages,
nbuf,
and
bufcache_max_pct
were developed by HP.
