fcache_fb_policy.5 (2010 09)

fcache_fb_policy(5) fcache_fb_policy(5)

(Tunable Kernel Parameters)

When Should the Value of This Tunable Be Changed to 2?

This tunable should be changed to 2 if applications running on the system have been highly tailored for

HP-UX 11i v2 behavior. It provides the most backwards compatible behavior.

What Are the Side Effects of Changing the Value?

Changing the value from 0 to 1 will cause increased I/O activity. Changing the value from 0 to 2 will

cause lower response time for

munmap() and

write() system calls. It may result in loss of overall

write performance.

What Other Tunables Should Be Changed at the Same Time?

None.

WARNINGS

All HP-UX kernel tunable parameters are release speciﬁc. This parameter may be removed or have its

meaning changed in future releases of HP-UX.

Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parame-

ter 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 the HP-UX Release Notes at

http://www.hp.com/go/hpux-core-

docs.

AUTHOR

fcache_fb_policy was developed by HP.