Tunable Kernel Parameters

Table of Tunable Kernel Parameters
Appendix A
72
ProcessMgmt:
Memory
pa_maxssiz_32bit Maximum size (in bytes) of the stack for a user process
running under the PA-RISC emulator on IPF. Manpage:
pa_maxssiz (5).
ProcessMgmt:
Memory
pa_maxssiz_64bit Maximum size (in bytes) of the stack for a user process
running under the PA-RISC emulator on IPF. Manpage:
pa_maxssiz (5).
Spinlock Pool pfdat_hash_locks Pfdat spinlock pool. Manpage: pfdat_hash_locks (5).
Miscellaneous:
Disk I/O
physical_io_buffers Total buffers for physical I/O operations. Manpage:
physical_io_buffers (5).
Spinlock Pool region_hash_locks Process-region spinlock pool. Manpage: region_hash_locks
(5).
Memory Paging remote_nfs_swap Enable or disable swap to mounted remote NFS file
system. Used on cluster clients for swapping to
NFS-mounted server file systems. Manpage:
remote_nfs_swap (5).
Miscellaneous:
Schedule
rtsched_numpri Number of distinct real-time interrupt scheduling priority
levels are available on the system. Manpage:
rtsched_numpri (5).
Miscellaneous:
Terminal
scroll_lines Defines the number of lines that can be scrolled on the
internal terminal emulator (ITE) system console.
Manpage: scroll_lines (5).
File System:
SCSI
scsi_maxphys Maximum record size for the SCSI I/O subsystem, in
bytes. Manpage: scsi_maxphys (5).
File System:
SCSI
scsi_max_qdepth Maximum number of SCSI commands queued up for SCSI
devices. Manpage: scsi_max_qdepth (5).
ProcessMgmt:
Process
secure_sid_scripts Controls whether setuid and setgid bits on scripts are
honored. Manpage: secure_sid_scripts (5).
IPC: Semaphore sema Enable or disable IPC semaphores at system boot time.
Manpage: sema (5).
IPC: Semaphore semaem Maximum value by which a semaphore can be changed in
a semaphore “undo” operation. Manpage: semaem (5).
IPC: Semaphore semmni Maximum number of sets of IPC semaphores allowed on
the system at any one time. Manpage: semmni (5).
IPC: Semaphore semmns Maximum number of individual IPC semaphores available
to system users, system-wide. Manpage: semmns (5).
IPC: Semaphore semmnu Maximum number of processes that can have undo
operations pending on any given IPC semaphore on the
system. Manpage: semmnu (5).
Table A-1 Tunable Kernel Parameters in Alphabetic Order (Continued)
Category Tunable Description