NAME
dbc_max_pct, dbc_min_pct, bufcache_max_pct, bufpages, nbuf — OBSOLETED kernel tunable parameter
DESCRIPTION
These tunables have been obsoleted and removed.
Do not make any changes to these tunables, as they have no effect
on the kernel.
Use the file cache tunables
filecache_max
and
filecache_min
(see
filecache_max(5)).
In previous releases, the tunables
dbc_min_pct
and
dbc_max_pct
were used to set limits to the dynamic buffer cache, and the tunables
bufcache_max_pct,
bufpages,
and
nbuf
were used for tuning the buffer cache when a static cache was desired.
This release of HP-UX offers improved file caching technology
and improved physical memory control associated
to caching file I/O data.
The number of tunable parameters used to control file caching memory usage is
reduced from five to two, and previous usability issues are addressed.
Restrictions on Changing
These tunables should not be modified.
Attempting to tune any of the obsolete buffer cache tunables,
bufcache_max_pct,
bufpages,
dbc_min_pct,
dbc_max_pct,
or
nbuf
results in an error.
Use the tunables
filecache_max
and
filecache_min
to set limits on the file cache.
Note that, on a any given system, the optimum values of these
two new tunables are not necessarily equivalent to the optimum values
of the obsolete buffer cache tunable values in the older systems.
You should first determine if the new default values yield acceptable
performance on your system, before attempting to change the values of the
new file cache tunables.
AUTHOR
bufcache_max_pct,
bufpages,
dbc_min_pct,
dbc_max_pct,
and
nbuf
were developed by HP.
Printable version
