Tunable Kernel Parameters
Table Of Contents
- Tunable Kernel Parameters
- Legal Notices
- Revision History
- Conventions
- 1 Overview
- 2 Accounting Subsystem
- 3 Asynchronous I/O Subsystem
- 4 File System Subsystem
- 5 Interprocess Communication (IPC) Subsystem
- 6 Kernel Crash Dump Subsystem
- 7 Memory Paging Subsystem
- 8 Process Management Subsystem
- 9 Spinlock Pool
- 10 Streams Subsystem
- 11 Miscellaneous Parameters
- Miscellaneous Parameter Summary
- CD-ROM Parameter Summary
- System Clock Parameter Summary
- Disk I/O Parameter Summary
- Intrusion Detection System/9000
- Fast Symbolic Link Traversal Parameter Summary
- Reserved System Memory Parameter Summary
- Network Parameter Summary
- Queued Signals Parameter Summary
- Real-Time Priority Parameter Summary
- Terminal Parameter Summary
- Maximum Users Parameter Summary
- Web Server Parameter Summary
- Miscellaneous Parameter Summary
- A Table of Tunable Kernel Parameters
Asynchronous I/O Subsystem
Asynchronous I/O Parameter Summary
Chapter 3
22
Asynchronous I/O Parameter Summary
The following kernel parameters are used for managing asynchronous I/O operations.
The first four (aio_*) are related to POSIX asynchronous I/O operations; the last
(max_async_ports) pertains to open ports between processes and the asynchronous disk
I/O driver.
See also “How to Specify Configurable Parameter Values” on page 13.
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).
Asynchronous
I/O
max_async_ports System-wide maximum number of ports to the
asynchronous disk I/O driver that processes can have open
at any given time. Manpage: max_async_ports (5).