Tunable Kernel Parameters

Table of Tunable Kernel Parameters
Appendix A
66
Table A-1 Tunable Kernel Parameters in Alphabetic Order
Category Tunable Description
Accounting acctresume Resume accounting when free space on the file system
where accounting log files reside rises above acctresume
plus minfree percent of total usable file system size.
Manpage: acctsuspend (5).
Accounting acctsuspend Suspend accounting when free space on the file system
where accounting log files reside drops below
acctsuspend plus minfree percent of total usable file
system size. Manpage: acctsuspend (5).
Asynchronous
I/O
aio_listio_max Maximum number of POSIX asynchronous I/O operations
allowed in a single lio_listio() call. Manpage:
aio_listio_max (5).
Asynchronous
I/O
aio_max_ops System-wide maximum number of POSIX asynchronous
I/O operations allowed at one time.Manpage: aio_max_ops
(5).
Asynchronous
I/O
aio_physmem_pct Maximum percentage of total system memory that can be
locked for use in POSIX asynchronous I/O operations.
Manpage: aio_physmem_pct (5).
Asynchronous
I/O
aio_prio_delta_max Maximum priority offset (slowdown factor) allowed in a
POSIX asynchronous I/O control block (aiocb). Manpage:
aio_prio_delta_max (5).
Memory Paging allocate_fs_swapmap Enable or disable preallocation of file system swap space
when swapon() is called as opposed to allocating swap
space when malloc() is called. Enabling allocation
reduces risk of insufficient swap space and is used
primarily where high availability is important. Manpage:
allocate_fs_swapmap (5).
Kernel Crash
Dump
alwaysdump Select which classes of system memory pages are to be
dumped if a kernel panic occurs. Manpage: alwaysdump
(5).
Spinlock Pool bufcache_hash_locks Buffer-cache spinlock pool. NO MANPAGE.
File System:
Buffer
bufpages Number of 4 KB pages in file system static buffer cache.
Manpage: bufpages (5).
Spinlock Pool chanq_hash_locks Channel queue spinlock pool. Manpage: chanq_hash_locks
(5).
IPC: Share core_addshmem_read Flag to include readable shared memory in a process core
dump. Manpage: core_addshmem_read (5).
IPC: Share core_addshmem_write Flag to include read/write shared memory in a process
core dump. Manpage: core_addshmem_write (5).