HP-UX HB v13.00 Ch-07 - Kernel Configuration

HP-UX Handbook – Rev 13.00 Page 24 (of 33)
Chapter 07 Kernel Configuration
October 29, 2013
Kernel Tunables
Tunable Types
There are a few different types of kernel tunables:
Type
Description
Introduced
Static
Traditional tunable parameters
prior to HPUX
10.20
Dynamic
Can be changed without rebooting the system
in HPUX 11.11
Automatic
If an automatic tunable is set to default then the
system determines an appropriate value at boot
time. Automatic tunables are not changed
automatically while the system is running!
in HPUX 11.23
and 11.31
User-Defined
Used like variables in other tunable formulas
in HPUX 11.23
and 11.31
For HPUX 11.31, a lot of new parameters are introduced and some parameters are obsolete. Here
is the full list:
Tunable Value Expression Changes
NSTREVENT 50 Default
NSTRPUSH 16 Default
NSTRSCHED 0 Default
STRCTLSZ 1024 Default
STRMSGSZ 0 Default
acctresume 4 Default
acctsuspend 2 Default
aio_iosize_max 0 Default Immed
aio_listio_max 256 Default Immed
aio_max_ops 2048 Default Immed
aio_monitor_run_sec 30 Default Immed
aio_physmem_pct 10 Default Immed
aio_prio_delta_max 20 Default Immed
aio_proc_max 0 Default Immed
aio_proc_thread_pct 70 Default Immed
aio_proc_threads 1024 Default Immed
aio_req_per_thread 1 Default Immed
allocate_fs_swapmap 0 Default
alwaysdump 0 Default Immed
audit_memory_usage 5 Default Immed
audit_track_paths 0 Default Auto
base_pagesize 4 Default
copy_on_write 1 Default Immed
core_addshmem_read 0 Default Immed
core_addshmem_write 0 Default Immed
create_fastlinks 0 Default
default_disk_ir 0 Default