diff options
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 369 |
1 files changed, 180 insertions, 189 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 92b30af3fdf6..4d175c751246 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -30,18 +30,17 @@ the beginning of each description states the restrictions within which a parameter is applicable: ACPI ACPI support is enabled. + AGP AGP (Accelerated Graphics Port) is enabled. ALSA ALSA sound support is enabled. APIC APIC support is enabled. APM Advanced Power Management support is enabled. AX25 Appropriate AX.25 support is enabled. - CD Appropriate CD support is enabled. DRM Direct Rendering Management support is enabled. EDD BIOS Enhanced Disk Drive Services (EDD) is enabled EFI EFI Partitioning (GPT) is enabled EIDE EIDE/ATAPI support is enabled. FB The frame buffer device is enabled. HW Appropriate hardware is enabled. - IA-32 IA-32 aka i386 architecture is enabled. IA-64 IA-64 architecture is enabled. IOSCHED More than one I/O scheduler is enabled. IP_PNP IP DHCP, BOOTP, or RARP is enabled. @@ -58,14 +57,14 @@ parameter is applicable: MDA MDA console support is enabled. MOUSE Appropriate mouse support is enabled. MSI Message Signaled Interrupts (PCI). - MTD MTD support is enabled. + MTD MTD (Memory Technology Device) support is enabled. NET Appropriate network support is enabled. NUMA NUMA support is enabled. GENERIC_TIME The generic timeofday code is enabled. NFS Appropriate NFS support is enabled. OSS OSS sound support is enabled. - PV_OPS A paravirtualized kernel - PARIDE The ParIDE subsystem is enabled. + PV_OPS A paravirtualized kernel is enabled. + PARIDE The ParIDE (parallel port IDE) subsystem is enabled. PARISC The PA-RISC architecture is enabled. PCI PCI bus support is enabled. PCMCIA The PCMCIA subsystem is enabled. @@ -92,6 +91,7 @@ parameter is applicable: VT Virtual terminal support is enabled. WDT Watchdog support is enabled. XT IBM PC/XT MFM hard disk support is enabled. + X86-32 X86-32, aka i386 architecture is enabled. X86-64 X86-64 architecture is enabled. More X86-64 boot options can be found in Documentation/x86_64/boot-options.txt . @@ -123,10 +123,6 @@ and is between 256 and 4096 characters. It is defined in the file ./include/asm/setup.h as COMMAND_LINE_SIZE. - 53c7xx= [HW,SCSI] Amiga SCSI controllers - See header of drivers/scsi/53c7xx.c. - See also Documentation/scsi/ncr53c7xx.txt. - acpi= [HW,ACPI,X86-64,i386] Advanced Configuration and Power Interface Format: { force | off | ht | strict | noirq } @@ -167,6 +163,8 @@ and is between 256 and 4096 characters. It is defined in the file acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA Format: <irq>,<irq>... + acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT + acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS Format: To spoof as Windows 98: ="Microsoft Windows" @@ -223,11 +221,17 @@ and is between 256 and 4096 characters. It is defined in the file acpi_fake_ecdt [HW,ACPI] Workaround failure due to BIOS lacking ECDT - acpi_pm_good [IA-32,X86-64] + acpi_pm_good [X86-32,X86-64] Override the pmtimer bug detection: force the kernel to assume that this machine's pmtimer latches its value and always returns good values. + agp= [AGP] + { off | try_unsupported } + off: disable AGP support + try_unsupported: try to drive unsupported chipsets + (may crash computer or cause data corruption) + enable_timer_pin_1 [i386,x86-64] Enable PIN 1 of APIC timer Can be useful to work around chipset bugs @@ -238,16 +242,9 @@ and is between 256 and 4096 characters. It is defined in the file Disable PIN 1 of APIC timer Can be useful to work around chipset bugs. - ad1816= [HW,OSS] - Format: <io>,<irq>,<dma>,<dma2> - See also Documentation/sound/oss/AD1816. - ad1848= [HW,OSS] Format: <io>,<irq>,<dma>,<dma2>,<type> - adlib= [HW,OSS] - Format: <io> - advansys= [HW,SCSI] See header of drivers/scsi/advansys.c. @@ -287,7 +284,8 @@ and is between 256 and 4096 characters. It is defined in the file not play well with APC CPU idle - disable it if you have APC and your system crashes randomly. - apic= [APIC,i386] Change the output verbosity whilst booting + apic= [APIC,i386] Advanced Programmable Interrupt Controller + Change the output verbosity whilst booting Format: { quiet (default) | verbose | debug } Change the amount of debugging information output when initialising the APIC and IO-APIC components. @@ -326,9 +324,6 @@ and is between 256 and 4096 characters. It is defined in the file autotest [IA64] - aztcd= [HW,CD] Aztech CD268 CDROM driver - Format: <io>,0x79 (?) - baycom_epp= [HW,AX25] Format: <io>,<mode> @@ -364,17 +359,13 @@ and is between 256 and 4096 characters. It is defined in the file c101= [NET] Moxa C101 synchronous serial card - cachesize= [BUGS=IA-32] Override level 2 CPU cache size detection. + cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection. Sometimes CPU hardware bugs make them report the cache size incorrectly. The kernel will attempt work arounds to fix known problems, but for some CPUs it is not possible to determine what the correct size should be. This option provides an override for these situations. - cdu31a= [HW,CD] - Format: <io>,<irq>[,PAS] - See header of drivers/cdrom/cdu31a.c. - chandev= [HW,NET] Generic channel device initialisation checkreqprot [SELINUX] Set initial checkreqprot flag value. @@ -387,7 +378,7 @@ and is between 256 and 4096 characters. It is defined in the file Value can be changed at runtime via /selinux/checkreqprot. - clock= [BUGS=IA-32, HW] gettimeofday clocksource override. + clock= [BUGS=X86-32, HW] gettimeofday clocksource override. [Deprecated] Forces specified clocksource (if available) to be used when calculating gettimeofday(). If specified @@ -405,7 +396,7 @@ and is between 256 and 4096 characters. It is defined in the file [ARM] imx_timer1,OSTS,netx_timer,mpu_timer2, pxa_timer,timer3,32k_counter,timer0_1 [AVR32] avr32 - [IA-32] pit,hpet,tsc,vmi-timer; + [X86-32] pit,hpet,tsc,vmi-timer; scx200_hrt on Geode; cyclone on IBM x440 [MIPS] MIPS [PARISC] cr16 @@ -425,12 +416,9 @@ and is between 256 and 4096 characters. It is defined in the file over the 8254 in addition to over the IO-APIC. The kernel tries to set a sensible default. - hpet= [IA-32,HPET] option to disable HPET and use PIT. + hpet= [X86-32,HPET] option to disable HPET and use PIT. Format: disable - cm206= [HW,CD] - Format: { auto | [<io>,][<irq>] } - com20020= [HW,NET] ARCnet - COM20020 chipset Format: <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]] @@ -462,20 +450,24 @@ and is between 256 and 4096 characters. It is defined in the file Documentation/networking/netconsole.txt for an alternative. - uart,io,<addr>[,options] - uart,mmio,<addr>[,options] + uart[8250],io,<addr>[,options] + uart[8250],mmio,<addr>[,options] Start an early, polled-mode console on the 8250/16550 UART at the specified I/O port or MMIO address, switching to the matching ttyS device later. The options are the same as for ttyS, above. + earlycon= [KNL] Output early console device and options. + uart[8250],io,<addr>[,options] + uart[8250],mmio,<addr>[,options] + Start an early, polled-mode console on the 8250/16550 + UART at the specified I/O port or MMIO address. + The options are the same as for ttyS, above. + cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver Format: <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] - cpia_pp= [HW,PPT] - Format: { parport<nr> | auto | none } - crashkernel=nn[KMG]@ss[KMG] [KNL] Reserve a chunk of physical memory to hold a kernel to switch to with kexec on panic. @@ -558,7 +550,7 @@ and is between 256 and 4096 characters. It is defined in the file dtc3181e= [HW,SCSI] - earlyprintk= [IA-32,X86-64,SH] + earlyprintk= [X86-32,X86-64,SH] earlyprintk=vga earlyprintk=serial[,ttySn[,baudrate]] @@ -596,7 +588,7 @@ and is between 256 and 4096 characters. It is defined in the file eisa_irq_edge= [PARISC,HW] See header of drivers/parisc/eisa.c. - elanfreq= [IA-32] + elanfreq= [X86-32] See comment before function elanfreq_setup() in arch/i386/kernel/cpu/cpufreq/elanfreq.c. @@ -605,7 +597,7 @@ and is between 256 and 4096 characters. It is defined in the file See Documentation/block/as-iosched.txt and Documentation/block/deadline-iosched.txt for details. - elfcorehdr= [IA-32, X86_64] + elfcorehdr= [X86-32, X86_64] Specifies physical address of start of kernel core image elf header. Generally kexec loader will pass this option to capture kernel. @@ -660,9 +652,6 @@ and is between 256 and 4096 characters. It is defined in the file gpt [EFI] Forces disk with valid GPT signature but invalid Protective MBR to be treated as GPT. - gscd= [HW,CD] - Format: <io> - gvp11= [HW,SCSI] hashdist= [KNL,NUMA] Large hashes allocated during boot @@ -690,7 +679,7 @@ and is between 256 and 4096 characters. It is defined in the file hisax= [HW,ISDN] See Documentation/isdn/README.HiSax. - hugepages= [HW,IA-32,IA-64] Maximal number of HugeTLB pages. + hugepages= [HW,X86-32,IA-64] Maximal number of HugeTLB pages. i8042.direct [HW] Put keyboard port into non-translated mode i8042.dumbkbd [HW] Pretend that controller can only read data from @@ -782,7 +771,8 @@ and is between 256 and 4096 characters. It is defined in the file See Documentation/nfsroot.txt. ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards - See comment before ip2_setup() in drivers/char/ip2.c. + See comment before ip2_setup() in + drivers/char/ip2/ip2base.c. ips= [HW,SCSI] Adaptec / IBM ServeRAID controller See header of drivers/scsi/ips.c. @@ -826,33 +816,53 @@ and is between 256 and 4096 characters. It is defined in the file tasks in the system -- can cause problems and suboptimal load balancer performance. - isp16= [HW,CD] - Format: <io>,<irq>,<dma>,<setup> - iucv= [HW,NET] js= [HW,JOY] Analog joystick See Documentation/input/joystick.txt. + kernelcore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter + specifies the amount of memory usable by the kernel + for non-movable allocations. The requested amount is + spread evenly throughout all nodes in the system. The + remaining memory in each node is used for Movable + pages. In the event, a node is too small to have both + kernelcore and Movable pages, kernelcore pages will + take priority and other nodes will have a larger number + of kernelcore pages. The Movable zone is used for the + allocation of pages that may be reclaimed or moved + by the page migration subsystem. This means that + HugeTLB pages may not be allocated from this zone. + Note that allocations like PTEs-from-HighMem still + use the HighMem zone if it exists, and the Normal + zone if it does not. + + movablecore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter + is similar to kernelcore except it specifies the + amount of memory used for migratable allocations. + If both kernelcore and movablecore is specified, + then kernelcore will be at *least* the specified + value but may be more. If movablecore on its own + is specified, the administrator must be careful + that the amount of memory usable for all allocations + is not too small. + keepinitrd [HW,ARM] - kstack=N [IA-32,X86-64] Print N words from the kernel stack + kstack=N [X86-32,X86-64] Print N words from the kernel stack in oops dumps. l2cr= [PPC] - lapic [IA-32,APIC] Enable the local APIC even if BIOS + lapic [X86-32,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 + lapic_timer_c2_ok [X86-32,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> - llsc*= [IA64] See function print_params() in - arch/ia64/sn/kernel/llsc4.c. - load_ramdisk= [RAM] List of ramdisks to load from floppy See Documentation/ramdisk.txt. @@ -939,14 +949,10 @@ 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. - 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. + should make use of. maxcpus=n : n >= 0 limits the + kernel to using 'n' processors. n=0 is a special case, + it is equivalent to "nosmp", which also disables + the IO APIC. max_addr=[KMG] [KNL,BOOT,ia64] All physical memory greater than or equal to this physical address is ignored. @@ -958,16 +964,11 @@ and is between 256 and 4096 characters. It is defined in the file [SCSI] Maximum number of LUNs received. Should be between 1 and 16384. - mca-pentium [BUGS=IA-32] + mca-pentium [BUGS=X86-32] mcatest= [IA-64] - mcd= [HW,CD] - Format: <port>,<irq>,<mitsumi_bug_93_wait> - - mcdx= [HW,CD] - - mce [IA-32] Machine Check Exception + mce [X86-32] Machine Check Exception md= [HW] RAID subsystems devices and level See Documentation/md.txt. @@ -979,14 +980,14 @@ and is between 256 and 4096 characters. It is defined in the file mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory Amount of memory to be used when the kernel is not able to see the whole system memory or for test. - [IA-32] Use together with memmap= to avoid physical + [X86-32] Use together with memmap= to avoid physical address space collisions. Without memmap= PCI devices could be placed at addresses belonging to unused RAM. - mem=nopentium [BUGS=IA-32] Disable usage of 4MB pages for kernel + mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel memory. - memmap=exactmap [KNL,IA-32,X86_64] Enable setting of an exact + memmap=exactmap [KNL,X86-32,X86_64] Enable setting of an exact E820 memory map, as specified by the user. Such memmap=exactmap lines can be constructed based on BIOS output or other requirements. See the memmap=nn@ss @@ -1009,49 +1010,6 @@ and is between 256 and 4096 characters. It is defined in the file mga= [HW,DRM] - migration_cost= - [KNL,SMP] debug: override scheduler migration costs - Format: <level-1-usecs>,<level-2-usecs>,... - This debugging option can be used to override the - default scheduler migration cost matrix. The numbers - are indexed by 'CPU domain distance'. - E.g. migration_cost=1000,2000,3000 on an SMT NUMA - box will set up an intra-core migration cost of - 1 msec, an inter-core migration cost of 2 msecs, - and an inter-node migration cost of 3 msecs. - - WARNING: using the wrong values here can break - scheduler performance, so it's only for scheduler - development purposes, not production environments. - - migration_debug= - [KNL,SMP] migration cost auto-detect verbosity - Format=<0|1|2> - If a system's migration matrix reported at bootup - seems erroneous then this option can be used to - increase verbosity of the detection process. - We default to 0 (no extra messages), 1 will print - some more information, and 2 will be really - verbose (probably only useful if you also have a - serial console attached to the system). - - migration_factor= - [KNL,SMP] multiply/divide migration costs by a factor - Format=<percent> - This debug option can be used to proportionally - increase or decrease the auto-detected migration - costs for all entries of the migration matrix. - E.g. migration_factor=150 will increase migration - costs by 50%. (and thus the scheduler will be less - eager migrating cache-hot tasks) - migration_factor=80 will decrease migration costs - by 20%. (thus the scheduler will be more eager to - migrate tasks) - - WARNING: using the wrong values here can break - scheduler performance, so it's only for scheduler - development purposes, not production environments. - mousedev.tap_time= [MOUSE] Maximum time between finger touching and leaving touchpad surface for touch to be considered @@ -1073,7 +1031,7 @@ and is between 256 and 4096 characters. It is defined in the file <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>] mtdparts= [MTD] - See drivers/mtd/cmdline.c. + See drivers/mtd/cmdlinepart.c. mtouchusb.raw_coordinates= [HW] Make the MicroTouch USB driver use raw coordinates @@ -1115,9 +1073,9 @@ and is between 256 and 4096 characters. It is defined in the file [NFS] set the maximum lifetime for idmapper cache entries. - nmi_watchdog= [KNL,BUGS=IA-32] Debugging features for SMP kernels + nmi_watchdog= [KNL,BUGS=X86-32] Debugging features for SMP kernels - no387 [BUGS=IA-32] Tells the kernel to use the 387 maths + no387 [BUGS=X86-32] Tells the kernel to use the 387 maths emulation library even if a 387 maths coprocessor is present. @@ -1148,17 +1106,17 @@ and is between 256 and 4096 characters. It is defined in the file noexec [IA-64] - noexec [IA-32,X86-64] + noexec [X86-32,X86-64] noexec=on: enable non-executable mappings (default) noexec=off: disable nn-executable mappings - nofxsr [BUGS=IA-32] Disables x86 floating point extended + nofxsr [BUGS=X86-32] Disables x86 floating point extended register save and restore. The kernel will only save legacy floating-point registers on task switch. nohlt [BUGS=ARM] - no-hlt [BUGS=IA-32] Tells the kernel that the hlt + no-hlt [BUGS=X86-32] Tells the kernel that the hlt instruction doesn't work correctly and not to use it. @@ -1173,12 +1131,12 @@ and is between 256 and 4096 characters. It is defined in the file Valid arguments: on, off Default: on - noirqbalance [IA-32,SMP,KNL] Disable kernel irq balancing + noirqbalance [X86-32,SMP,KNL] Disable kernel irq balancing - noirqdebug [IA-32] Disables the code which attempts to detect and + noirqdebug [X86-32] Disables the code which attempts to detect and disable unhandled interrupt sources. - no_timer_check [IA-32,X86_64,APIC] Disables the code which tests for + no_timer_check [X86-32,X86_64,APIC] Disables the code which tests for broken timer IRQ sources. noisapnp [ISAPNP] Disables ISA PnP code. @@ -1188,20 +1146,22 @@ and is between 256 and 4096 characters. It is defined in the file nointroute [IA-64] - nolapic [IA-32,APIC] Do not enable or use the local APIC. + nojitter [IA64] Disables jitter checking for ITC timers. + + nolapic [X86-32,APIC] Do not enable or use the local APIC. - nolapic_timer [IA-32,APIC] Do not use the local APIC timer. + nolapic_timer [X86-32,APIC] Do not use the local APIC timer. noltlbs [PPC] Do not use large page/tlb entries for kernel lowmem mapping on PPC40x. nomca [IA-64] Disable machine check abort handling - nomce [IA-32] Machine Check Exception + nomce [X86-32] Machine Check Exception - noreplace-paravirt [IA-32,PV_OPS] Don't patch paravirt_ops + noreplace-paravirt [X86-32,PV_OPS] Don't patch paravirt_ops - noreplace-smp [IA-32,SMP] Don't replace SMP instructions + noreplace-smp [X86-32,SMP] Don't replace SMP instructions with UP alternatives noresidual [PPC] Don't use residual data on PReP machines. @@ -1215,32 +1175,34 @@ and is between 256 and 4096 characters. It is defined in the file nosbagart [IA-64] - nosep [BUGS=IA-32] Disables x86 SYSENTER/SYSEXIT support. + nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support. - nosmp [SMP] Tells an SMP kernel to act as a UP kernel. + nosmp [SMP] Tells an SMP kernel to act as a UP kernel, + and disable the IO APIC. legacy for "maxcpus=0". + + nosoftlockup [KNL] Disable the soft-lockup detector. nosync [HW,M68K] Disables sync negotiation for all devices. - notsc [BUGS=IA-32] Disable Time Stamp Counter + notsc [BUGS=X86-32] Disable Time Stamp Counter nousb [USB] Disable the USB subsystem nowb [ARM] + numa_zonelist_order= [KNL, BOOT] Select zonelist order for NUMA. + one of ['zone', 'node', 'default'] can be specified + This can be set from sysctl after boot. + See Documentation/sysctl/vm.txt for details. + nr_uarts= [SERIAL] maximum number of UARTs to be registered. opl3= [HW,OSS] Format: <io> - opl3sa2= [HW,OSS] Format: - <io>,<irq>,<dma>,<dma2>,<mss_io>,<mpu_io>,<ymode>,<loopback>[,<isapnp>,<multiple] - oprofile.timer= [HW] Use timer interrupt instead of performance counters - optcd= [HW,CD] - Format: <io> - osst= [HW,SCSI] SCSI Tape Driver Format: <buffer_size>,<write_threshold> See also Documentation/scsi/st.txt. @@ -1295,28 +1257,28 @@ and is between 256 and 4096 characters. It is defined in the file See also Documentation/paride.txt. pci=option[,option...] [PCI] various PCI subsystem options: - off [IA-32] don't probe for the PCI bus - bios [IA-32] force use of PCI BIOS, don't access + off [X86-32] don't probe for the PCI bus + bios [X86-32] force use of PCI BIOS, don't access the hardware directly. Use this if your machine has a non-standard PCI host bridge. - nobios [IA-32] disallow use of PCI BIOS, only direct + nobios [X86-32] disallow use of PCI BIOS, only direct hardware access methods are allowed. Use this if you experience crashes upon bootup and you suspect they are caused by the BIOS. - conf1 [IA-32] Force use of PCI Configuration + conf1 [X86-32] Force use of PCI Configuration Mechanism 1. - conf2 [IA-32] Force use of PCI Configuration + conf2 [X86-32] Force use of PCI Configuration Mechanism 2. - nommconf [IA-32,X86_64] Disable use of MMCONFIG for PCI + nommconf [X86-32,X86_64] Disable use of MMCONFIG for PCI Configuration nomsi [MSI] If the PCI_MSI kernel config parameter is enabled, this kernel boot option can be used to disable the use of MSI interrupts system-wide. - nosort [IA-32] Don't sort PCI devices according to + nosort [X86-32] Don't sort PCI devices according to order given by the PCI BIOS. This sorting is done to get a device order compatible with older kernels. - biosirq [IA-32] Use PCI BIOS calls to get the interrupt + biosirq [X86-32] Use PCI BIOS calls to get the interrupt routing table. These calls are known to be buggy on several machines and they hang the machine when used, but on other computers it's the only @@ -1324,32 +1286,32 @@ and is between 256 and 4096 characters. It is defined in the file this option if the kernel is unable to allocate IRQs or discover secondary PCI buses on your motherboard. - rom [IA-32] Assign address space to expansion ROMs. + rom [X86-32] Assign address space to expansion ROMs. Use with caution as certain devices share address decoders between ROMs and other resources. - irqmask=0xMMMM [IA-32] Set a bit mask of IRQs allowed to be + irqmask=0xMMMM [X86-32] Set a bit mask of IRQs allowed to be assigned automatically to PCI devices. You can make the kernel exclude IRQs of your ISA cards this way. - pirqaddr=0xAAAAA [IA-32] Specify the physical address + pirqaddr=0xAAAAA [X86-32] Specify the physical address of the PIRQ table (normally generated by the BIOS) if it is outside the F0000h-100000h range. - lastbus=N [IA-32] Scan all buses thru bus #N. Can be + lastbus=N [X86-32] Scan all buses thru bus #N. Can be useful if the kernel is unable to find your secondary buses and you want to tell it explicitly which ones they are. - assign-busses [IA-32] Always assign all PCI bus + assign-busses [X86-32] Always assign all PCI bus numbers ourselves, overriding whatever the firmware may have done. - usepirqmask [IA-32] Honor the possible IRQ mask stored + usepirqmask [X86-32] Honor the possible IRQ mask stored in the BIOS $PIR table. This is needed on some systems with broken BIOSes, notably some HP Pavilion N5400 and Omnibook XE3 notebooks. This will have no effect if ACPI IRQ routing is enabled. - noacpi [IA-32] Do not use ACPI for IRQ routing + noacpi [X86-32] Do not use ACPI for IRQ routing or for PCI scanning. routeirq Do IRQ routing for all PCI devices. This is normally done in pci_enable_device(), @@ -1419,6 +1381,15 @@ and is between 256 and 4096 characters. It is defined in the file autoconfiguration. Ranges are in pairs (memory base and size). + print-fatal-signals= + [KNL] debug: print fatal signals + print-fatal-signals=1: print segfault info to + the kernel console. + default: off. + + printk.time= Show timing data prefixed to each printk message line + Format: <bool> (1/Y/y=enable, 0/N/n=disable) + profile= [KNL] Enable kernel profiling via /proc/profile Format: [schedule,]<number> Param: "schedule" - profile schedule points. @@ -1489,13 +1460,13 @@ and is between 256 and 4096 characters. It is defined in the file Run specified binary instead of /init from the ramdisk, used for early userspace startup. See initrd. - reboot= [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode + reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode Format: <reboot_mode>[,<reboot_mode2>[,...]] See arch/*/kernel/reboot.c or arch/*/kernel/process.c reserve= [KNL,BUGS] Force the kernel to ignore some iomem area - reservetop= [IA-32] + reservetop= [X86-32] Format: nn[KMG] Reserves a hole at the top of the kernel virtual address space. @@ -1547,11 +1518,6 @@ and is between 256 and 4096 characters. It is defined in the file sbni= [NET] Granch SBNI12 leased line adapter - sbpcd= [HW,CD] Soundblaster CD adapter - Format: <io>,<type> - See a comment before function sbpcd_setup() in - drivers/cdrom/sbpcd.c. - sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver Format: <io>[,<timeout>[,<isapnp>]] @@ -1591,7 +1557,7 @@ and is between 256 and 4096 characters. It is defined in the file Value can be changed at runtime via /selinux/compat_net. - serialnumber [BUGS=IA-32] + serialnumber [BUGS=X86-32] sg_def_reserved_size= [SCSI] @@ -1604,47 +1570,47 @@ and is between 256 and 4096 characters. It is defined in the file simeth= [IA-64] simscsi= - sjcd= [HW,CD] - Format: <io>,<irq>,<dma> - See header of drivers/cdrom/sjcd.c. - slram= [HW,MTD] - slub_debug [MM, SLUB] - Enabling slub_debug allows one to determine the culprit - if slab objects become corrupted. Enabling slub_debug - creates guard zones around objects and poisons objects - when not in use. Also tracks the last alloc / free. - For more information see Documentation/vm/slub.txt. + slub_debug[=options[,slabs]] [MM, SLUB] + Enabling slub_debug allows one to determine the + culprit if slab objects become corrupted. Enabling + slub_debug can create guard zones around objects and + may poison objects when not in use. Also tracks the + last alloc / free. For more information see + Documentation/vm/slub.txt. slub_max_order= [MM, SLUB] - Determines the maximum allowed order for slabs. Setting - this too high may cause fragmentation. - For more information see Documentation/vm/slub.txt. + Determines the maximum allowed order for slabs. + A high setting may cause OOMs due to memory + fragmentation. For more information see + Documentation/vm/slub.txt. slub_min_objects= [MM, SLUB] - The minimum objects per slab. SLUB will increase the - slab order up to slub_max_order to generate a - sufficiently big slab to satisfy the number of objects. - The higher the number of objects the smaller the overhead - of tracking slabs. + The minimum number of objects per slab. SLUB will + increase the slab order up to slub_max_order to + generate a sufficiently large slab able to contain + the number of objects indicated. The higher the number + of objects the smaller the overhead of tracking slabs + and the less frequently locks need to be acquired. For more information see Documentation/vm/slub.txt. slub_min_order= [MM, SLUB] Determines the mininum page order for slabs. Must be - lower than slub_max_order + lower than slub_max_order. For more information see Documentation/vm/slub.txt. slub_nomerge [MM, SLUB] - Disable merging of slabs of similar size. May be + Disable merging of slabs with similar size. May be necessary if there is some reason to distinguish - allocs to different slabs. + allocs to different slabs. Debug options disable + merging on their own. For more information see Documentation/vm/slub.txt. smart2= [HW] Format: <io1>[,<io2>[,...,<io8>]] - smp-alt-once [IA-32,SMP] On a hotplug CPU system, only + smp-alt-once [X86-32,SMP] On a hotplug CPU system, only attempt to substitute SMP alternatives once at boot. smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices @@ -1780,9 +1746,6 @@ and is between 256 and 4096 characters. It is defined in the file snd-ymfpci= [HW,ALSA] - sonycd535= [HW,CD] - Format: <io>[,<irq>] - sonypi.*= [HW] Sony Programmable I/O Control Device driver See Documentation/sonypi.txt @@ -1853,7 +1816,32 @@ and is between 256 and 4096 characters. It is defined in the file thash_entries= [KNL,NET] Set number of hash buckets for TCP connection + thermal.act= [HW,ACPI] + -1: disable all active trip points in all thermal zones + <degrees C>: override all lowest active trip points + + thermal.crt= [HW,ACPI] + -1: disable all critical trip points in all thermal zones + <degrees C>: lower all critical trip points + + thermal.nocrt= [HW,ACPI] + Set to disable actions on ACPI thermal zone + critical and hot trip points. + + thermal.off= [HW,ACPI] + 1: disable ACPI thermal control + + thermal.psv= [HW,ACPI] + -1: disable all passive trip points + <degrees C>: override all passive trip points to this value + + thermal.tzp= [HW,ACPI] + Specify global default ACPI thermal zone polling rate + <deci-seconds>: poll all this frequency + 0: no polling (default) + time Show timing data prefixed to each printk message line + [deprecated, see 'printk.time'] tipar.timeout= [HW,PPT] Set communications timeout in tenths of a second @@ -1911,15 +1899,18 @@ and is between 256 and 4096 characters. It is defined in the file usbhid.mousepoll= [USBHID] The interval which mice are to be polled at. - vdso= [IA-32,SH] + vdso= [X86-32,SH,x86-64] vdso=2: enable compat VDSO (default with COMPAT_VDSO) vdso=1: enable VDSO (default) vdso=0: disable VDSO mapping + vector= [IA-64,SMP] + vector=percpu: enable percpu vector domain + video= [FB] Frame buffer configuration See Documentation/fb/modedb.txt. - vga= [BOOT,IA-32] Select a particular video mode + vga= [BOOT,X86-32] Select a particular video mode See Documentation/i386/boot.txt and Documentation/svga.txt. Use vga=ask for menu. @@ -1951,7 +1942,7 @@ and is between 256 and 4096 characters. It is defined in the file See header of drivers/scsi/wd7000.c. wdt= [WDT] Watchdog - See Documentation/watchdog/watchdog.txt. + See Documentation/watchdog/wdt.txt. xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. xd_geo= See header of drivers/block/xd.c. |