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
http://docs.hp.com.
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 [ Back ] |
