Jump to content United States-English
HP.com Home Products and Services Support and Drivers Solutions How to Buy
» Contact HP
More options
HP.com home
HP-UX Reference > D

dbc_max_pct(5)

Kernel Tunable Parameter
OBSOLETED
HP-UX 11i Version 3: February 2007
» 

Technical documentation

» Feedback
Content starts here

 » Table of Contents

 » Index

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
Privacy statement Using this site means you accept its terms Feedback to webmaster
© 1983-2007 Hewlett-Packard Development Company, L.P.