diff options
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 94 |
1 files changed, 85 insertions, 9 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index abd575cfc75..84c3bd05c63 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -48,6 +48,7 @@ parameter is applicable: ISAPNP ISA PnP code is enabled. ISDN Appropriate ISDN support is enabled. JOY Appropriate joystick support is enabled. + LIBATA Libata driver is enabled LP Printer support is enabled. LOOP Loopback device support is enabled. M68k M68k architecture is enabled. @@ -78,6 +79,7 @@ parameter is applicable: Documentation/scsi/. SELINUX SELinux support is enabled. SERIAL Serial support is enabled. + SH SuperH architecture is enabled. SMP The kernel is an SMP kernel. SPARC Sparc architecture is enabled. SWSUSP Software suspend is enabled. @@ -124,7 +126,8 @@ and is between 256 and 4096 characters. It is defined in the file See header of drivers/scsi/53c7xx.c. See also Documentation/scsi/ncr53c7xx.txt. - acpi= [HW,ACPI] Advanced Configuration and Power Interface + acpi= [HW,ACPI,X86-64,i386] + Advanced Configuration and Power Interface Format: { force | off | ht | strict | noirq } force -- enable ACPI if default was off off -- disable ACPI if default was on @@ -135,6 +138,12 @@ and is between 256 and 4096 characters. It is defined in the file See also Documentation/pm.txt, pci=noacpi + acpi_apic_instance= [ACPI, IOAPIC] + Format: <int> + 2: use 2nd APIC table, if available + 1,0: use 1st APIC table + default: 0 + acpi_sleep= [HW,ACPI] Sleep options Format: { s3_bios, s3_mode } See Documentation/power/video.txt @@ -172,19 +181,41 @@ and is between 256 and 4096 characters. It is defined in the file that require a timer override, but don't have HPET - acpi_dbg_layer= [HW,ACPI] + acpi.debug_layer= [HW,ACPI] Format: <int> Each bit of the <int> indicates an ACPI debug layer, 1: enable, 0: disable. It is useful for boot time debugging. After system has booted up, it can be set - via /proc/acpi/debug_layer. - - acpi_dbg_level= [HW,ACPI] + via /sys/module/acpi/parameters/debug_layer. + CONFIG_ACPI_DEBUG must be enabled for this to produce any output. + Available bits (add the numbers together) to enable debug output + for specific parts of the ACPI subsystem: + 0x01 utilities 0x02 hardware 0x04 events 0x08 tables + 0x10 namespace 0x20 parser 0x40 dispatcher + 0x80 executer 0x100 resources 0x200 acpica debugger + 0x400 os services 0x800 acpica disassembler. + The number can be in decimal or prefixed with 0x in hex. + Warning: Many of these options can produce a lot of + output and make your system unusable. Be very careful. + + acpi.debug_level= [HW,ACPI] Format: <int> Each bit of the <int> indicates an ACPI debug level, 1: enable, 0: disable. It is useful for boot time debugging. After system has booted up, it can be set - via /proc/acpi/debug_level. + via /sys/module/acpi/parameters/debug_level. + CONFIG_ACPI_DEBUG must be enabled for this to produce any output. + Available bits (add the numbers together) to enable different + debug output levels of the ACPI subsystem: + 0x01 error 0x02 warn 0x04 init 0x08 debug object + 0x10 info 0x20 init names 0x40 parse 0x80 load + 0x100 dispatch 0x200 execute 0x400 names 0x800 operation region + 0x1000 bfield 0x2000 tables 0x4000 values 0x8000 objects + 0x10000 resources 0x20000 user requests 0x40000 package. + The number can be in decimal or prefixed with 0x in hex. + Warning: Many of these options can produce a lot of + output and make your system unusable. Be very careful. + acpi_fake_ecdt [HW,ACPI] Workaround failure due to BIOS lacking ECDT @@ -484,7 +515,7 @@ and is between 256 and 4096 characters. It is defined in the file dtc3181e= [HW,SCSI] - earlyprintk= [IA-32,X86-64] + earlyprintk= [IA-32,X86-64,SH] earlyprintk=vga earlyprintk=serial[,ttySn[,baudrate]] @@ -771,6 +802,9 @@ and is between 256 and 4096 characters. It is defined in the file lapic [IA-32,APIC] Enable the local APIC even if BIOS disabled it. + lapic_timer_c2_ok [IA-32,x86-64,APIC] trust the local apic timer in + C2 power state. + lasi= [HW,SCSI] PARISC LASI driver for the 53c700 chip Format: addr:<io>,irq:<irq> @@ -863,7 +897,14 @@ and is between 256 and 4096 characters. It is defined in the file Format: <1-256> maxcpus= [SMP] Maximum number of processors that an SMP kernel - should make use of + should make use of. + Using "nosmp" or "maxcpus=0" will disable SMP + entirely (the MPS table probe still happens, though). + A command-line option of "maxcpus=<NUM>", where <NUM> + is an integer greater than 0, limits the maximum number + of CPUs activated in SMP mode to <NUM>. + Using "maxcpus=1" on an SMP kernel is the trivial + case of an SMP kernel with only one CPU. max_addr=[KMG] [KNL,BOOT,ia64] All physical memory greater than or equal to this physical address is ignored. @@ -1038,6 +1079,10 @@ and is between 256 and 4096 characters. It is defined in the file emulation library even if a 387 maths coprocessor is present. + noacpi [LIBATA] Disables use of ACPI in libata suspend/resume + when set. + Format: <int> + noaliencache [MM, NUMA] Disables the allcoation of alien caches in the slab allocator. Saves per-node memory, but will impact performance on real NUMA hardware. @@ -1103,6 +1148,8 @@ and is between 256 and 4096 characters. It is defined in the file nolapic [IA-32,APIC] Do not enable or use the local APIC. + nolapic_timer [IA-32,APIC] Do not use the local APIC timer. + noltlbs [PPC] Do not use large page/tlb entries for kernel lowmem mapping on PPC40x. @@ -1275,6 +1322,12 @@ and is between 256 and 4096 characters. It is defined in the file This sorting is done to get a device order compatible with older (<= 2.4) kernels. nobfsort Don't sort PCI devices into breadth-first order. + cbiosize=nn[KMG] The fixed amount of bus space which is + reserved for the CardBus bridge's IO window. + The default value is 256 bytes. + cbmemsize=nn[KMG] The fixed amount of bus space which is + reserved for the CardBus bridge's memory + window. The default value is 64 megabytes. pcmv= [HW,PCMCIA] BadgePAD 4 @@ -1667,6 +1720,22 @@ and is between 256 and 4096 characters. It is defined in the file stifb= [HW] Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]] + sunrpc.pool_mode= + [NFS] + Control how the NFS server code allocates CPUs to + service thread pools. Depending on how many NICs + you have and where their interrupts are bound, this + option will affect which CPUs will do NFS serving. + Note: this parameter cannot be changed while the + NFS server is running. + + auto the server chooses an appropriate mode + automatically using heuristics + global a single global pool contains all CPUs + percpu one pool for each CPU + pernode one pool for each NUMA node (equivalent + to global on non-NUMA machines) + swiotlb= [IA-64] Number of I/O TLB slabs switches= [HW,M68k] @@ -1740,10 +1809,17 @@ and is between 256 and 4096 characters. It is defined in the file Note that genuine overcurrent events won't be reported either. + usbcore.autosuspend= + [USB] The autosuspend time delay (in seconds) used + for newly-detected USB devices (default 2). This + is the time required before an idle device will be + autosuspended. Devices for which the delay is set + to a negative value won't be autosuspended at all. + usbhid.mousepoll= [USBHID] The interval which mice are to be polled at. - vdso= [IA-32] + vdso= [IA-32,SH] vdso=1: enable VDSO (default) vdso=0: disable VDSO mapping |