Tunable Kernel Parameters

Table of Tunable Kernel Parameters
Appendix A
67
Miscellaneous:
Links
create_fastlinks Create fast symbolic links using a newer, more efficient
format to improve access speed by reducing disk block
accesses during path name look-up sequences. Manpage:
create_fastlinks (5).
File System:
Buffer
dbc_max_pct Maximum percentage of memory for dynamic buffer cache.
Manpage: dbc_max_pct (5).
File System:
Buffer
dbc_min_pct Minimum percentage of memory for dynamic buffer cache.
Manpage: dbc_min_pct (5).
Miscellaneous:
Disk I/O
default_disk_ir Immediate reporting for disk writes; whether a write()
returns immediately after the data is placed in the disk's
write buffer or waits until the data is physically stored on
the disk media. Manpage: default_disk_ir (5).
File System:
Buffer
disksort_seconds Maximum wait time for disk requests. NO MANPAGE.
Miscellaneous:
Disk I/O
dma32_pool_size Amount of memory to set aside for 32-bit DMA (bytes).
Manpage: dma32_pool_size (5).
Spinlock Pool dnlc_hash_locks Number of locks for directory cache synchronization. NO
MANPAGE.
Kernel Crash
Dump
dontdump Select which classes of system memory pages are not to be
dumped if a kernel panic occurs. Manpage: dontdump (5).
Miscellaneous:
Clock
dst Enable/disable daylight savings time. Manpage: timezone
(5).
Miscellaneous:
IDS
enable_idds Flag to enable the IDDS daemon, which gathers data for
IDS/9000. Manpage: enable_idds (5).
Miscellaneous:
Memory
eqmemsize Number of pages of memory to be reserved for
equivalently mapped memory, used mostly for DMA
transfers. Manpage: eqmemsize (5).
ProcessMgmt:
Process
executable_stack Allows or denies program execution on the stack.
Manpage: executable_stack (5).
File System:
Write
fs_async Enable/disable asynchronous writes of file system data
structures to disk. Manpage: fs_async (5).
Spinlock Pool ftable_hash_locks File table spinlock pool. NO MANPAGE.
Spinlock Pool hdlpreg_hash_locks Set the size of the pregion spinlock pool. Manpage:
hdlpreg_hash_locks (5).
File System:
Read
hfs_max_ra_blocks The maximum number of read-ahead blocks that the
kernel may have outstanding for a single HFS file system.
Manpage: hfs_max_ra_blocks (5).
Table A-1 Tunable Kernel Parameters in Alphabetic Order (Continued)
Category Tunable Description