General Kernel Parameters
This section discusses general kernel parameters, including those for the following: Shared memory Processes Signals Profiling/debugging System
Shared Memory
Sysctl Prefix: kernel /proc Prefix: /proc/sys/kernel/ Parameter | Description |
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sem | Semaphore values | msgmnb | Maximum message queue in bytes | msgmni | Maximum allowed message queue identifiers | msgmax | Maximum message size in bytes | shmmni | Number of shared segments system-wide | shmall | Shared memory system-wide in pages | shmmax | Shared segment size in bytes |
Processes
Sysctl Prefix: kernel /proc Prefix: /proc/sys/kernel/ Parameter | Description |
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tHRead_max | Maximum threads allowed in the system |
Signals
Sysctl Prefix: kernel /proc Prefix: /proc/sys/kernel/ Parameter | Description |
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rtsig-max | Maximum real-time signals | rtsig-nr | Number of currently queued real-time signals |
Profiling/Debugging
Sysctl Prefix: kernel /proc Prefix: /proc/sys/kernel/ Parameter | Description |
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sysrq | System trace request | printk | Printk values | The printk parameter has four fields: console_loglevel, default_message_ loglevel, minimum_console_level, and default_console_level. Messages with a higher priority than console_loglevel are printed to the console. Messages without an explicit priority are printed with default_message_loglevel priority. The minimum (highest) value to which console_loglevel can be set is determined by the minimum_console_level parameter. The default_console_loglevel is the default value for console_loglevel.
System
Sysctl Prefix: kernel /proc Prefix: /proc/sys/kernel/ Parameter | Description |
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domainname | Domain name | hostname | Host name | ostype | Operating system type | osrelease | Operating system release | version | Kernel version | real-root-dev | Real root device partition | |