diff options
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 83 |
1 files changed, 75 insertions, 8 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 50680a59a2f..8f441dab039 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -343,6 +343,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. no: ACPI OperationRegions are not marked as reserved, no further checks are performed. + acpi_no_memhotplug [ACPI] Disable memory hotplug. Useful for kdump + kernels. + add_efi_memmap [EFI; X86] Include EFI memory map in kernel's map of available physical RAM. @@ -463,6 +466,22 @@ bytes respectively. Such letter suffixes can also be entirely omitted. atkbd.softrepeat= [HW] Use software keyboard repeat + audit= [KNL] Enable the audit sub-system + Format: { "0" | "1" } (0 = disabled, 1 = enabled) + 0 - kernel audit is disabled and can not be enabled + until the next reboot + unset - kernel audit is initialized but disabled and + will be fully enabled by the userspace auditd. + 1 - kernel audit is initialized and partially enabled, + storing at most audit_backlog_limit messages in + RAM until it is fully enabled by the userspace + auditd. + Default: unset + + audit_backlog_limit= [KNL] Set the audit queue size limit. + Format: <int> (must be >=0) + Default: 64 + baycom_epp= [HW,AX25] Format: <io>,<mode> @@ -515,7 +534,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted. cgroup_disable= [KNL] Disable a particular controller Format: {name of the controller(s) to disable} - {Currently supported controllers - "memory"} + The effects of cgroup_disable=foo are: + - foo isn't auto-mounted if you mount all cgroups in + a single hierarchy + - foo isn't visible as an individually mountable + subsystem + {Currently only "memory" controller deal with this and + cut the overhead, others just disable the usage. So + only cgroup_disable=memory is actually worthy} checkreqprot [SELINUX] Set initial checkreqprot flag value. Format: { "0" | "1" } @@ -774,6 +800,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted. disable= [IPV6] See Documentation/networking/ipv6.txt. + disable_cpu_apicid= [X86,APIC,SMP] + Format: <int> + The number of initial APIC ID for the + corresponding CPU to be disabled at boot, + mostly used for the kdump 2nd kernel to + disable BSP to wake up multiple CPUs without + causing system reset or hang due to sending + INIT from AP to BSP. + disable_ddw [PPC/PSERIES] Disable Dynamic DMA Window support. Use this if to workaround buggy firmware. @@ -881,6 +916,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted. The xen output can only be used by Xen PV guests. + edac_report= [HW,EDAC] Control how to report EDAC event + Format: {"on" | "off" | "force"} + on: enable EDAC to report H/W event. May be overridden + by other higher priority error reporting module. + off: disable H/W event reporting through EDAC. + force: enforce the use of EDAC to report H/W event. + default: on. + ekgdboc= [X86,KGDB] Allow early kernel console debugging ekgdboc=kbd @@ -890,6 +933,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. edd= [EDD] Format: {"off" | "on" | "skip[mbr]"} + efi= [EFI] + Format: { "old_map" } + old_map [X86-64]: switch to the old ioremap-based EFI + runtime services mapping. 32-bit still uses this one by + default. + efi_no_storage_paranoia [EFI; X86] Using this parameter you can use more than 50% of your efi variable storage. Use this parameter only if @@ -1013,7 +1062,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. debugfs files are removed at module unload time. gpt [EFI] Forces disk with valid GPT signature but - invalid Protective MBR to be treated as GPT. + invalid Protective MBR to be treated as GPT. If the + primary GPT is corrupted, it enables the backup/alternate + GPT to be used instead. grcan.enable0= [HW] Configuration of physical interface 0. Determines the "Enable 0" bit of the configuration register. @@ -1415,6 +1466,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. Valid arguments: on, off Default: on + kmemcheck= [X86] Boot-time kmemcheck enable/disable/one-shot mode + Valid arguments: 0, 1, 2 + kmemcheck=0 (disabled) + kmemcheck=1 (enabled) + kmemcheck=2 (one-shot mode) + Default: 2 (one-shot mode) + kstack=N [X86] Print N words from the kernel stack in oops dumps. @@ -1529,6 +1587,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. * atapi_dmadir: Enable ATAPI DMADIR bridge support + * disable: Disable this device. + If there are multiple matching configurations changing the same attribute, the last one is used. @@ -1992,6 +2052,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted. noapic [SMP,APIC] Tells the kernel to not make use of any IOAPICs that may be present in the system. + nokaslr [X86] + Disable kernel base offset ASLR (Address Space + Layout Randomization) if built into the kernel. + noautogroup Disable scheduler automatic task group creation. nobats [PPC] Do not use BATs for mapping kernel lowmem @@ -2625,7 +2689,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted. for RCU-preempt, and "s" for RCU-sched, and "N" is the CPU number. This reduces OS jitter on the offloaded CPUs, which can be useful for HPC and - real-time workloads. It can also improve energy efficiency for asymmetric multiprocessors. @@ -2641,8 +2704,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. periodically wake up to do the polling. rcutree.blimit= [KNL] - Set maximum number of finished RCU callbacks to process - in one batch. + Set maximum number of finished RCU callbacks to + process in one batch. rcutree.rcu_fanout_leaf= [KNL] Increase the number of CPUs assigned to each @@ -2661,8 +2724,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. value is one, and maximum value is HZ. rcutree.qhimark= [KNL] - Set threshold of queued - RCU callbacks over which batch limiting is disabled. + Set threshold of queued RCU callbacks beyond which + batch limiting is disabled. rcutree.qlowmark= [KNL] Set threshold of queued RCU callbacks below which @@ -3061,7 +3124,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted. controller if no parameter or 1 is given or disable it if 0 is given (See Documentation/cgroups/memory.txt) - swiotlb= [IA-64] Number of I/O TLB slabs + swiotlb= [ARM,IA-64,PPC,MIPS,X86] + Format: { <int> | force } + <int> -- Number of I/O TLB slabs + force -- force using of bounce buffers even if they + wouldn't be automatically used by the kernel switches= [HW,M68k] |