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Unix-like software that manages kernel attributes
sysctl is a software mechanism in some Unix-like operating systems that reads and modifies the attributes of the system kernel such as its version number
Sysctl
Pseudo file system provided by the Linux kernel
used for their configuration. sysfs provides functionality similar to the sysctl mechanism found in BSD operating systems, with the difference that sysfs
Sysfs
Period when a computer system is available
information is available from the sysctl system, both in the form of the sysctl command and the sysctl() C function. The sysctl entry is called kern.boottime
Uptime
System call for device-specific input/output operations
According to an OpenBSD developer, ioctl and sysctl are the two system calls for extending the kernel, with sysctl possibly being the simpler of the two. In
Ioctl
Unix philosophy
4BSD-derived sysctls are key/value mappings managed by the sysctl program, which lists all variables with sysctl -a, the value of one variable with sysctl net
Everything_is_a_file
Transmission control protocol configurable option
include the line "net.ipv4.tcp_window_scaling=0" in /etc/sysctl.conf (or /etc/sysctl.d/99-sysctl.conf as of systemd 207). Default setting for FreeBSD, OpenBSD
TCP_window_scale_option
Keyboard commands for recovering a Linux machine
compile-time option in the kernel configuration, CONFIG_MAGIC_SYSRQ, and a sysctl kernel parameter, kernel.sysrq. On newer kernels (since 2.6.12), it is possible
Magic_SysRq_key
Filesystem in Unix-like operating systems
information about the kernel and to change certain kernel parameters at runtime (sysctl). Many Unix-like operating systems support the proc filesystem, including
Procfs
Extension to the Internet Protocol to signal network congestion
activated through the sysctl interface by setting 1 as value for the sysctl parameter net.inet.tcp.ecn.enable. Likewise, on OpenBSD, the sysctl net.inet.tcp.ecn
Explicit Congestion Notification
Explicit_Congestion_Notification
this description and value can be checked by the command sysctl: sysctl -d net.inet.tcp.msl sysctl net.inet.tcp.msl which gets the result: net.inet.tcp.msl:
Maximum_segment_lifetime
Hardware monitoring sensors framework
kernel-level hardware sensors framework originating from OpenBSD, which uses the sysctl kernel interface as the transport layer between the kernel and the userland
Hw.sensors
Short-lived transport protocol port for IP communications
Ports, ... 49152-65535 (never assigned) Microsoft KB Article 929851 "IP Sysctl". The Linux Kernel documentation. Retrieved 2021-06-27. The default values
Ephemeral_port
Computer memory design used in multiprocessing
pages shared between processes, or the use of transparent huge pages; new sysctl settings allow NUMA balancing to be enabled or disabled, as well as the
Non-uniform_memory_access
Computer security technique
added in 2010. It is off by default, and can be enabled by setting the sysctl vm.randomize_mmap to 1. Support for ASLR appeared in FreeBSD 13.0. It is
Address space layout randomization
Address_space_layout_randomization
64-bit x86 register
include a constant rate TSC (identified by the kern.timecounter.invariant_tsc sysctl on FreeBSD or by the "constant_tsc" flag in Linux's /proc/cpuinfo). With
Time_Stamp_Counter
American software engineer (born 1966)
ALTQ Bluetooth BPF CARP ipfw NDIS netgraph PF Subsystems busdma DPorts ioctl kqueue moused OpenPAM sysctl hw.sensors systat SMBus People Matthew Dillon
Matthew_Dillon
Free Unix-like operating system kernel
September 2020. "The Sysctl Interface". Linux.it. Archived from the original on 17 February 2020. Retrieved 13 September 2020. "sysctl(8) - Linux manual
Linux_kernel
Hardware-assisted virtualization on x86/x86-64 CPUs
for AMD-V is "svm". This may be checked in BSD derivatives via dmesg or sysctl and in Linux via /proc/cpuinfo. Instructions in AMD-V include VMRUN, VMLOAD
X86_virtualization
Hardware monitoring sensors framework
replaced by a sysctl(8)", "should one be developed"; it can be noted that in 2003 this was the exact approach taken by OpenBSD with sysctl hw.sensors when
Envsys
Dynamically loadable module that extends a running operating system kernel
attacker to hide the break-in. Linux allows disabling module loading via sysctl option /proc/sys/kernel/modules_disabled. An initramfs system may load specific
Loadable_kernel_module
Communication standard for marine electronics
sensors framework with the nmea(4) pseudo-device driver OpenNTPD through sysctl hw.sensors § timedelta API Rand McNally StreetFinder ObserVIEW QGIS NMEA
NMEA_0183
OS-level virtualisation
default, but may be enabled by setting the security.jail.allow_raw_sockets sysctl option. Additionally, interaction between processes that are not running
FreeBSD_jail
Principal protocol used to stream data across an IP network
Archived from the original on 2020-03-31. Retrieved 2016-07-21. RFC 3522. "IP sysctl". Linux Kernel Documentation. Archived from the original on 5 March 2016
Transmission_Control_Protocol
Suite of system components for Linux
state of the systemd system and service manager. Not to be confused with sysctl. systemd-analyze may be used to determine system boot-up performance statistics
Systemd
Free and open-source operating system
ALTQ Bluetooth BPF CARP ipfw NDIS netgraph PF Subsystems busdma DPorts ioctl kqueue moused OpenPAM sysctl hw.sensors systat SMBus People Matthew Dillon
DragonFly_BSD
Firmware for hardware initialization and OS runtime services
(LPC). Some operating systems, like NetBSD with envsys and OpenBSD with sysctl hw.sensors, feature integrated interfacing with hardware monitors. However
BIOS
Collection of Unix tools in single executable file
— Write pending cached data to disk (synchronize), blocking until done. sysctl — Read/write system control data (under /proc/sys). tac — Output lines in
Toybox
Means of improving the efficiency of TCP/IP networks
the Windows registry turns off delayed ACK by default. On FreeBSD, the sysctl entry net.inet.tcp.delayed_ack controls the default behavior. No such switch
Nagle's_algorithm
optionally restrict certain capabilities. Securelevel is controlled by the sysctl variable kern.securelevel. This value is an integer, which when set to a
Securelevel
Microarchitecture from Intel
fix is to set hw.acpi.cpu.cx_lowest=C1 and dev.cpu.<n>.lowest via /etc/sysctl.conf. 14 nm Airmont architecture processors are also affected by the design
Silvermont
Operating system
system detection. Address space layout randomization (ASLR) by default Basic sysctl hw.sensors API introduced for hardware monitoring. Unsupported: 3.5 1 May
OpenBSD
Computer networking term
urpf-failed option, while Free-, Net-, and DragonflyBSD provide a global sysctl options. uRPF Tolley, William J. (2019-12-04). "[CVE-2019-14899] Inferring
Host_model
Serial communication bus
sensors, both I2C and otherwise, are exported to the userland through the sysctl hw.sensors framework. As of March 2019[update], OpenBSD has over two dozen
I2C
Free and open-source Unix-like operating system
load of long-running processes on multiple CPUs, and tunable kern.sched sysctl(3) parameters were introduced. The release of NetBSD 10.0 brought significant
NetBSD
Virtual file system in the Linux kernel
typically mounted at /sys/kernel/config (or more rarely at /config). tmpfs sysctl – an interface for examining and dynamically changing parameters in the
Configfs
Component that monitors resources in a computer system
software like SpeedFan on Windows, lm_sensors on Linux, envstat on NetBSD, and sysctl hw.sensors on OpenBSD and DragonFly can interface with these chips to relay
System_monitor
TCP congestion avoidance algorithm
starting with kernel 2.4.13 in 2001, where it can be enabled through the sysctl interface. However, due to the fairness issues when competing with loss-based
TCP_Vegas
More accurate congestion notification for TCP. LWN. February 18, 2026 IP Sysctl. kernel.org. Dual-Queue Coupled Active Queue Management (AQM) for Low Latency
Comparison of operating system kernels
Comparison_of_operating_system_kernels
File system from DragonFly BSD
ALTQ Bluetooth BPF CARP ipfw NDIS netgraph PF Subsystems busdma DPorts ioctl kqueue moused OpenPAM sysctl hw.sensors systat SMBus People Matthew Dillon
HAMMER2
Internal computer component that provides power to other components
a system monitor software like lm_sensors on Linux, envstat on NetBSD, sysctl hw.sensors on OpenBSD and DragonFly BSD, or SpeedFan on Windows. Most power
Power_supply_unit_(computer)
configure various kernel components of Linux sysctlfs – allow accessing sysctl nodes via a file system; available on NetBSD via PUFFS, FreeBSD kernel via
List_of_file_systems
OS-level virtualisation
ALTQ Bluetooth BPF CARP ipfw NDIS netgraph PF Subsystems busdma DPorts ioctl kqueue moused OpenPAM sysctl hw.sensors systat SMBus People Matthew Dillon
Vkernel
Generic RAID volume management
framework in OpenBSD, and can be monitored through familiar tools like sysctl, SNMP and sensorsd. As of 2019[update], in NetBSD, an older SES/SAF-TE driver
Bioctl
Topics referred to by the same term
2007 progressive rock album Sensors (journal), a Swiss open access journal sysctl hw.sensors, an OpenBSD framework for hardware monitoring sensors lm_sensors
Sensors_(disambiguation)
System calls in Unix-like operating systems
operating system in release 5.6 (November 2014), as a refactoring of the sysctl(3) KERN_ARND approach used since 1997. Linux offers a very similar system
Entropy-supplying system calls
Entropy-supplying_system_calls
Type of personal computer
1. Even easier fan control". Quiet Computing with BSD: Fan control with sysctl hw.sensors. AsiaBSDCon 2010 Proceedings. 11–14 March 2010. Tokyo University
Quiet_PC
Printf-like function for the Linux kernel
<linux/kern_levels.h>. Which log levels are printed is configured using the sysctl file /proc/sys/kernel/printk. The %p format specifier which is supported
Printk
UNIX file system permission
The fs.protected_fifos, fs.protected_regular, and fs.protected_symlinks sysctls further restrict the creation of FIFOs, creation of regular files, and
Sticky_bit
Security features as used in OpenBSD operating system
into useless garbage. Toggling this feature can be done using a single sysctl configuration option, and doesn't require any prior setup, disk partitioning
OpenBSD_security_features
Microcode in x86 Intel processors
illustrated in FIGS. 5 and 6, respectively." "Microcode updater interface sysctl" (ucode.c driver). XNU. Retrieved 24 January 2018. #define IA32_BIOS_UPDT_TRIG
Intel_microcode
File system from DragonFly BSD
ALTQ Bluetooth BPF CARP ipfw NDIS netgraph PF Subsystems busdma DPorts ioctl kqueue moused OpenPAM sysctl hw.sensors systat SMBus People Matthew Dillon
HAMMER_(file_system)
Hierarchical interface
to userspace. More traditional Unix systems locate this information in sysctl calls. ObexFS is a FUSE-based filesystem that provides access to OBEX objects
Synthetic_file_system
Command-line software
and DragonFly BSD. Constantine A. Murenin (2007-10-14). "Port OpenBSD's sysctl Hardware Sensors framework". FreeBSD. Retrieved 2019-03-26. Peter N. M.
Systat_(BSD)
SYSCTL
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Boy/Male
Hindu
Thunder
Girl/Female
Tamil
River
Boy/Male
Arabic, Muslim
Guardian; Protector; Custodian
Girl/Female
Gujarati, Hindu, Indian, Marathi, Sanskrit
Brilliant
Girl/Female
Teutonic
Peaceful.
Girl/Female
Australian, Danish, German, Swedish
Sweetness of Face; Favour; Grace; Transparent Like Water
Girl/Female
Hindu, Indian
Oxygen; Breathe of Life
Boy/Male
Sikh
Victory of good company
Boy/Male
Hindu
Lord Shiva
Boy/Male
Hindu
Sing gods praise or glory, Lord Shiva
SYSCTL
SYSCTL
SYSCTL
SYSCTL
SYSCTL