Linux Kernel Parameters. The following is a consolidated list of the kernel parameters as implemented. Loadable modules, after being loaded into the running kernel, also. Some of these. parameters may be changed at runtime by the command. The text in square brackets at. ACPI ACPI support is enabled. 0-9 802.1x Extensible Authentication Protocol. An advantage of the EAP architecture is its flexibility. EAP is used to select a specific authentication mechanism. This limit depends on the architecture. It is defined in the file. COMMAND. These 'K', 'M', and 'G' letters represent the binary. Kilo', 'Mega', and 'Giga', equalling 2^1. Such letter suffixes can also be entirely omitted. Linux: At the shell prompt, type lspci >lspci.log; On-board 8051 processor and RAM/ROM memory; If the BCM44xx or BCM57xx driver is loaded, attach /proc/net/nicinfo. Easily Turn Your Desktop Wireless. The ASUS PCE-N15 is designed to provide complete end-to-end wireless performance from the server or server backbone to the switch. By default, the standard Wi. For some broken Nvidia NF5 boards. HPET. acpi. IO ports and memory declared in ACPI might be. ACPI subsystem in arbitrary AML code and. This option. gives you up to 3% performance improvement on AMD F1. CPU- intensive style benchmark, and it can vary highly in. A high-speed wireless network card that is used to access a network through a USB port on a computer or laptop. The latest PC gaming hardware news, plus expert, trustworthy and unbiased buying guides. PlayStation 3 Secrets The purpose of this webpage is to provide information (a majority are secret or are hard to find) on the PS3. If you think you know all there is. Learn about, buy and get support for the many home networking products we manufacture, including wireless routers, range extenders and network cameras. This is handy if debugging. Otherwise they are. AMD IOMMU found in. The IOMMU driver is not. This option. does not override iommu=pt. With this option enabled, AMD IOMMU. ACPI tables for AMD IOMMU during. IOMMU initialization. SPARCstation- Fox does. APC CPU idle - disable it if you have. APC and your system crashes randomly. The parameter defines the maximal. Also it is possible. The kernel will attempt work arounds. CPUs it is not. possible to determine what the correct size should be. So. only cgroup. This is useful. If specified. clocksource is not available, it defaults to PIT. See. arch/x. 86/include/asm/cpufeature. Note the Linux specific bits are not necessarily. This just prevents it from. For more information, see. This is for. both Xen and Power. PC hypervisors. Defaults to 1. A value of 0. disables the blank timer. This parameter reserves the physical. If '@offset' is omitted, then a suitable offset. Check. Documentation/kdump/kdump. The syntax of range is. See also. Documentation/kdump/kdump. Allow kernel. to allocate physical memory region from top, so could. G if system have more than 4. G ram installed. When crashkernel=X,high. G, that cause second kernel crash on system. See Documentation/dynamic- debug- howto. Bigger value increase the probability. The maximum. possible value is MAX. Note that there exists a class. H/W or. F/W or by drivers badly programing DMA (basically when. CPU MMU is. bypassed) which are not detectable by. CONFIG. This is the size represented by. APIs, used for SHM, and. Use this if. to workaround buggy firmware. This parameter disables that. One entry is. required per DMA- API allocation. Use this if the. DMA- API debugging code disables itself because the. Just. pass the driver to filter for as the parameter. This parameter. allows to specify an EDID data set in the. Details and. instructions how to build your own EDID data are. Documentation/EDID/HOWTO. An EDID. data set will only be used for a particular connector. EDID. name. It is not enabled by. May be overridden. Use this parameter only if. UEFI does sane gc and. Generally. kexec loader will pass this option to capture kernel. This parameter enables that. See its documentation for details. Using this. parameter will force ia. This list can be changed at run. This list can be changed at run time. If the. primary GPT is corrupted, it enables the backup/alternate. GPT to be used instead. Determines. the . Determines. the . This works even on boxes that have no. This also works to reduce highmem. Valid pages sizes on. M (when the CPU supports . Valid values: 0. 8. This is only. useful for debugging when something happens in the window. Normally a. brightness value of 0 indicates backlight switched off. If this parameter is set to 0. If a gfx. device has a dedicated DMAR unit, the DMAR unit is. DMAR with this option. In. this case, gfx device will use physical address for. DMA. The default is to look. With this option, super page will. Intended to get systems with badly broken. Also check all handlers each timer. Intended to get systems with badly broken. You can move a process onto or off an. The. alternative - - manually setting the CPU mask of all. For. example, to map IOAPIC- ID decimal 1. PCI device 0. 0: 1. For. example, to map HPET- ID decimal 0 to. PCI device 0. 0: 1. The. remaining memory in each node is used for Movable. In the event, a node is too small to have both. Movable pages, kernelcore pages will. Movable pages. Default is 1 (enabled). Default. back to the programmable timer unit in the LAPIC. It can. also be changed with klogd or other programs. The. loglevels are defined as follows. KERN. Using. lp=port. A port specification may be 'none' to skip. Specifying 'lp=auto' instead of a. IDs. from each port should be examined, to see if. IEEE 1. 28. 4- compliant printer is attached; if. To determine. the correct value for your kernel, boot with normal. Note that. on SMP systems the preset will be applied to all CPUs. CPUs need. significantly divergent settings. An incorrect value. I/O errors and other breakage. Although. unlikely, in the extreme case this might damage your. The default. number is configured by BLK. Instead. of statically allocating a predefined number, loop. Use together. with memmap= to avoid physical address space collisions. See the memmap=nn@ss. Each pass selects another test. Memtest. fills the memory with this pattern, validates. Tiny. BIOS. version 0. The TFT backlight pin will be. VESA blanking code and a GPIO. LED. This parameter is not necessary when using the. VGA shield. The. touchscreen support is not enabled in the mainstream. A value. of 0 disables mminit logging and a level of 4 will. Information is printed at KERN. If movablecore on its own. See mm/Kconfig for details. It is largest continuous chunk. It is granularity of mtrr block. It is spare mtrr entries number. RISCom/N2 synchronous serial card. In effect it is. disabling idmapping, which can make migration from. NFSv. 2/v. 3 systems to NFSv. Please note that. Please see. Documentation/filesystems/pnfs. By default netpoll. Users could use console. The kernel will only save. The kernel will fallback to. This is also useful when using JTAG debugger. This increases. power- consumption. On the positive side, it reduces. The boot CPU will be forced outside. Known dependencies are. Resume from suspend/hibernate depends on CPU0. PIC interrupts also depend on CPU0. CPU0 can't be. removed if a PIC interrupt is detected. Later in runtime you can not. Default is to just kill the. You can specify the base. IRQ, and DMA settings; IRQ and DMA. FIFO even if it is detected). This is necessary on Pegasos. Use this if your machine. PCI host bridge. Use this. BIOS. This. should never be necessary. This fixes a source of spurious IRQs. IRQs. These calls are known to be buggy. Try. this option if the kernel is unable to allocate. IRQs or discover secondary PCI buses on your. You can. make the kernel exclude IRQs of your ISA cards. Can be. useful if the kernel is unable to find your. This is needed on. BIOSes, notably. some HP Pavilion N5. Omnibook XE3. notebooks. This will have no effect if ACPI. IRQ routing is enabled. This is currently used on. IXP2. 00. 0 systems where the bus has to be. CPUs. But various workarounds are disabled. IOMMU drivers will not work. Also set MRRS (Max. Read Request Size) to the largest supported. MPS that the device. This. configuration allows peer- to- peer DMA between. The default value is 6. This is the. the default. Overwrites compiled- in. An invalid security module name will be treated. Enabling. slub. Also tracks the. For more information see. Documentation/vm/slub. For more information see. Documentation/vm/slub. SLUB will. increase the slab order up to slub. The higher the number. Must be. lower than slub. May be. necessary if there is some reason to distinguish. Debug options disable. This list can be changed at run. Note, this enables stack tracing. Increasing these values may allow you to. When this option is enabled. When this option. CONFIG. Disable the usage of the cleancache. API to send anonymous pages to the hypervisor. Disable the usage of the frontswap. API to send swap pages to the hypervisor. If disabled. the selfballooning and selfshrinking are force disabled. Disable the driving of swap pages. Partial swapoff that immediately. Xen hypervisor back to the. Tracing can. be enabled again by echoing '1' into the . Used to enable. high- resolution timer mode on older hardware, and in. This can be used to increase the. MB on x. 86). It can also be used to. RAM. Default: 2 = underline. UTF- 8 mode is enabled for all. Default is - 1. i.
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