Merge branch 'for-2.6.33' of git://linux-nfs.org/~bfields/linux

[safe/jmp/linux-2.6] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 7e3c9f3..5ba4d9d 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -57,6 +57,7 @@ parameter is applicable:
        ISAPNP  ISA PnP code is enabled.
        ISDN    Appropriate ISDN support is enabled.
        JOY     Appropriate joystick support is enabled.
        ISAPNP  ISA PnP code is enabled.
        ISDN    Appropriate ISDN support is enabled.
        JOY     Appropriate joystick support is enabled.

+       KVM     Kernel Virtual Machine support is enabled.

        LIBATA  Libata driver is enabled
        LP      Printer support is enabled.
        LOOP    Loopback device support is enabled.
        LIBATA  Libata driver is enabled
        LP      Printer support is enabled.
        LOOP    Loopback device support is enabled.


@@ -84,7 +85,6 @@ parameter is applicable:
        PPT     Parallel port support is enabled.
        PS2     Appropriate PS/2 support is enabled.
        RAM     RAM disk support is enabled.
        PPT     Parallel port support is enabled.
        PS2     Appropriate PS/2 support is enabled.
        RAM     RAM disk support is enabled.

-       ROOTPLUG The example Root Plug LSM is enabled.

        S390    S390 architecture is enabled.
        SCSI    Appropriate SCSI support is enabled.
                        A lot of drivers has their options described inside of
        S390    S390 architecture is enabled.
        SCSI    Appropriate SCSI support is enabled.
                        A lot of drivers has their options described inside of


@@ -344,6 +344,15 @@ and is between 256 and 4096 characters. It is defined in the file
                        Change the amount of debugging information output
                        when initialising the APIC and IO-APIC components.
 
                        Change the amount of debugging information output
                        when initialising the APIC and IO-APIC components.
 

+       show_lapic=     [APIC,X86] Advanced Programmable Interrupt Controller
+                       Limit apic dumping. The parameter defines the maximal
+                       number of local apics being dumped. Also it is possible
+                       to set it to "all" by meaning -- no limit here.
+                       Format: { 1 (default) | 2 | ... | all }.
+                       The parameter valid if only apic=debug or
+                       apic=verbose is specified.
+                       Example: apic=debug show_lapic=all
+

        apm=            [APM] Advanced Power Management
                        See header of arch/x86/kernel/apm_32.c.
 
        apm=            [APM] Advanced Power Management
                        See header of arch/x86/kernel/apm_32.c.
 


@@ -670,7 +679,8 @@ and is between 256 and 4096 characters. It is defined in the file
        earlyprintk=    [X86,SH,BLACKFIN]
                        earlyprintk=vga
                        earlyprintk=serial[,ttySn[,baudrate]]
        earlyprintk=    [X86,SH,BLACKFIN]
                        earlyprintk=vga
                        earlyprintk=serial[,ttySn[,baudrate]]

-                       earlyprintk=dbgp
+                       earlyprintk=ttySn[,baudrate]
+                       earlyprintk=dbgp[debugController#]

 
                        Append ",keep" to not disable it when the real console
                        takes over.
 
                        Append ",keep" to not disable it when the real console
                        takes over.


@@ -777,6 +787,13 @@ and is between 256 and 4096 characters. It is defined in the file
                        by the set_ftrace_notrace file in the debugfs
                        tracing directory.
 
                        by the set_ftrace_notrace file in the debugfs
                        tracing directory.
 

+       ftrace_graph_filter=[function-list]
+                       [FTRACE] Limit the top level callers functions traced
+                       by the function graph tracer at boot up.
+                       function-list is a comma separated list of functions
+                       that can be changed at run time by the
+                       set_graph_function file in the debugfs tracing directory.
+

        gamecon.map[2|3]=
                        [HW,JOY] Multisystem joystick and NES/SNES/PSX pad
                        support via parallel port (up to 5 devices per port)
        gamecon.map[2|3]=
                        [HW,JOY] Multisystem joystick and NES/SNES/PSX pad
                        support via parallel port (up to 5 devices per port)


@@ -932,7 +949,7 @@ and is between 256 and 4096 characters. It is defined in the file
                        1 -- enable informational integrity auditing messages.
 
        ima_hash=       [IMA]
                        1 -- enable informational integrity auditing messages.
 
        ima_hash=       [IMA]

-                       Formt: { "sha1" | "md5" }
+                       Format: { "sha1" | "md5" }

                        default: "sha1"
 
        ima_tcb         [IMA]
                        default: "sha1"
 
        ima_tcb         [IMA]


@@ -1015,7 +1032,7 @@ and is between 256 and 4096 characters. It is defined in the file
                        No delay
 
        ip=             [IP_PNP]
                        No delay
 
        ip=             [IP_PNP]

-                       See Documentation/filesystems/nfsroot.txt.
+                       See Documentation/filesystems/nfs/nfsroot.txt.

 
        ip2=            [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
                        See comment before ip2_setup() in
 
        ip2=            [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
                        See comment before ip2_setup() in


@@ -1098,6 +1115,44 @@ and is between 256 and 4096 characters. It is defined in the file
        kstack=N        [X86] Print N words from the kernel stack
                        in oops dumps.
 
        kstack=N        [X86] Print N words from the kernel stack
                        in oops dumps.
 

+       kvm.ignore_msrs=[KVM] Ignore guest accesses to unhandled MSRs.
+                       Default is 0 (don't ignore, but inject #GP)
+
+       kvm.oos_shadow= [KVM] Disable out-of-sync shadow paging.
+                       Default is 1 (enabled)
+
+       kvm-amd.nested= [KVM,AMD] Allow nested virtualization in KVM/SVM.
+                       Default is 0 (off)
+
+       kvm-amd.npt=    [KVM,AMD] Disable nested paging (virtualized MMU)
+                       for all guests.
+                       Default is 1 (enabled) if in 64bit or 32bit-PAE mode
+
+       kvm-intel.bypass_guest_pf=
+                       [KVM,Intel] Disables bypassing of guest page faults
+                       on Intel chips. Default is 1 (enabled)
+
+       kvm-intel.ept=  [KVM,Intel] Disable extended page tables
+                       (virtualized MMU) support on capable Intel chips.
+                       Default is 1 (enabled)
+
+       kvm-intel.emulate_invalid_guest_state=
+                       [KVM,Intel] Enable emulation of invalid guest states
+                       Default is 0 (disabled)
+
+       kvm-intel.flexpriority=
+                       [KVM,Intel] Disable FlexPriority feature (TPR shadow).
+                       Default is 1 (enabled)
+
+       kvm-intel.unrestricted_guest=
+                       [KVM,Intel] Disable unrestricted guest feature
+                       (virtualized real and unpaged mode) on capable
+                       Intel chips. Default is 1 (enabled)
+
+       kvm-intel.vpid= [KVM,Intel] Disable Virtual Processor Identification
+                       feature (tagged TLBs) on capable Intel chips.
+                       Default is 1 (enabled)
+

        l2cr=           [PPC]
 
        l3cr=           [PPC]
        l2cr=           [PPC]
 
        l3cr=           [PPC]


@@ -1115,6 +1170,10 @@ and is between 256 and 4096 characters. It is defined in the file
                        libata.dma=4      Compact Flash DMA only 
                        Combinations also work, so libata.dma=3 enables DMA
                        for disks and CDROMs, but not CFs.
                        libata.dma=4      Compact Flash DMA only 
                        Combinations also work, so libata.dma=3 enables DMA
                        for disks and CDROMs, but not CFs.

+       
+       libata.ignore_hpa=      [LIBATA] Ignore HPA limit
+                       libata.ignore_hpa=0       keep BIOS limits (default)
+                       libata.ignore_hpa=1       ignore limits, using full disk

 
        libata.noacpi   [LIBATA] Disables use of ACPI in libata suspend/resume
                        when set.
 
        libata.noacpi   [LIBATA] Disables use of ACPI in libata suspend/resume
                        when set.


@@ -1243,6 +1302,10 @@ and is between 256 and 4096 characters. It is defined in the file
                        (machvec) in a generic kernel.
                        Example: machvec=hpzx1_swiotlb
 
                        (machvec) in a generic kernel.
                        Example: machvec=hpzx1_swiotlb
 

+       machtype=       [Loongson] Share the same kernel image file between different
+                        yeeloong laptop.
+                       Example: machtype=lemote-yeeloong-2f-7inch
+

        max_addr=nn[KMG]        [KNL,BOOT,ia64] All physical memory greater
                        than or equal to this physical address is ignored.
 
        max_addr=nn[KMG]        [KNL,BOOT,ia64] All physical memory greater
                        than or equal to this physical address is ignored.
 


@@ -1490,15 +1553,23 @@ and is between 256 and 4096 characters. It is defined in the file
                        going to be removed in 2.6.29.
 
        nfsaddrs=       [NFS]
                        going to be removed in 2.6.29.
 
        nfsaddrs=       [NFS]

-                       See Documentation/filesystems/nfsroot.txt.
+                       See Documentation/filesystems/nfs/nfsroot.txt.

 
        nfsroot=        [NFS] nfs root filesystem for disk-less boxes.
 
        nfsroot=        [NFS] nfs root filesystem for disk-less boxes.

-                       See Documentation/filesystems/nfsroot.txt.
+                       See Documentation/filesystems/nfs/nfsroot.txt.

 
        nfs.callback_tcpport=
                        [NFS] set the TCP port on which the NFSv4 callback
                        channel should listen.
 
 
        nfs.callback_tcpport=
                        [NFS] set the TCP port on which the NFSv4 callback
                        channel should listen.
 

+       nfs.cache_getent=
+                       [NFS] sets the pathname to the program which is used
+                       to update the NFS client cache entries.
+
+       nfs.cache_getent_timeout=
+                       [NFS] sets the timeout after which an attempt to
+                       update a cache entry is deemed to have failed.
+

        nfs.idmap_cache_timeout=
                        [NFS] set the maximum lifetime for idmapper cache
                        entries.
        nfs.idmap_cache_timeout=
                        [NFS] set the maximum lifetime for idmapper cache
                        entries.


@@ -1510,7 +1581,7 @@ and is between 256 and 4096 characters. It is defined in the file
                        of returning the full 64-bit number.
                        The default is to return 64-bit inode numbers.
 
                        of returning the full 64-bit number.
                        The default is to return 64-bit inode numbers.
 

-       nmi_debug=      [KNL,AVR32] Specify one or more actions to take
+       nmi_debug=      [KNL,AVR32,SH] Specify one or more actions to take

                        when a NMI is triggered.
                        Format: [state][,regs][,debounce][,die]
 
                        when a NMI is triggered.
                        Format: [state][,regs][,debounce][,die]
 


@@ -1531,6 +1602,11 @@ and is between 256 and 4096 characters. It is defined in the file
                        symbolic names: lapic and ioapic
                        Example: nmi_watchdog=2 or nmi_watchdog=panic,lapic
 
                        symbolic names: lapic and ioapic
                        Example: nmi_watchdog=2 or nmi_watchdog=panic,lapic
 

+       netpoll.carrier_timeout=
+                       [NET] Specifies amount of time (in seconds) that
+                       netpoll should wait for a carrier. By default netpoll
+                       waits 4 seconds.
+

        no387           [BUGS=X86-32] Tells the kernel to use the 387 maths
                        emulation library even if a 387 maths coprocessor
                        is present.
        no387           [BUGS=X86-32] Tells the kernel to use the 387 maths
                        emulation library even if a 387 maths coprocessor
                        is present.


@@ -1711,6 +1787,11 @@ and is between 256 and 4096 characters. It is defined in the file
                        waiting for the ACK, so if this is set too high
                        interrupts *may* be lost!
 
                        waiting for the ACK, so if this is set too high
                        interrupts *may* be lost!
 

+       omap_mux=       [OMAP] Override bootloader pin multiplexing.
+                       Format: <mux_mode0.mode_name=value>...
+                       For example, to override I2C bus2:
+                       omap_mux=i2c2_scl.i2c2_scl=0x100,i2c2_sda.i2c2_sda=0x100
+

        opl3=           [HW,OSS]
                        Format: <io>
 
        opl3=           [HW,OSS]
                        Format: <io>
 


@@ -1720,8 +1801,8 @@ and is between 256 and 4096 characters. It is defined in the file
        oprofile.cpu_type=      Force an oprofile cpu type
                        This might be useful if you have an older oprofile
                        userland or if you want common events.
        oprofile.cpu_type=      Force an oprofile cpu type
                        This might be useful if you have an older oprofile
                        userland or if you want common events.

-                       Format: { archperfmon }
-                       archperfmon: [X86] Force use of architectural
+                       Format: { arch_perfmon }
+                       arch_perfmon: [X86] Force use of architectural

                                perfmon on Intel CPUs instead of the
                                CPU specific event set.
 
                                perfmon on Intel CPUs instead of the
                                CPU specific event set.
 


@@ -1915,6 +1996,13 @@ and is between 256 and 4096 characters. It is defined in the file
                        Format: { 0 | 1 }
                        See arch/parisc/kernel/pdc_chassis.c
 
                        Format: { 0 | 1 }
                        See arch/parisc/kernel/pdc_chassis.c
 

+       percpu_alloc=   Select which percpu first chunk allocator to use.
+                       Currently supported values are "embed" and "page".
+                       Archs may support subset or none of the selections.
+                       See comments in mm/percpu.c for details on each
+                       allocator.  This parameter is primarily for debugging
+                       and performance comparison.
+

        pf.             [PARIDE]
                        See Documentation/blockdev/paride.txt.
 
        pf.             [PARIDE]
                        See Documentation/blockdev/paride.txt.
 


@@ -1964,8 +2052,15 @@ and is between 256 and 4096 characters. It is defined in the file
 
        print-fatal-signals=
                        [KNL] debug: print fatal signals
 
        print-fatal-signals=
                        [KNL] debug: print fatal signals

-                       print-fatal-signals=1: print segfault info to
-                       the kernel console.
+
+                       If enabled, warn about various signal handling
+                       related application anomalies: too many signals,
+                       too many POSIX.1 timers, fatal signals causing a
+                       coredump - etc.
+
+                       If you hit the warning due to signal overflow,
+                       you might want to try "ulimit -i unlimited".
+

                        default: off.
 
        printk.time=    Show timing data prefixed to each printk message line
                        default: off.
 
        printk.time=    Show timing data prefixed to each printk message line


@@ -2096,15 +2191,6 @@ and is between 256 and 4096 characters. It is defined in the file
                        Useful for devices that are detected asynchronously
                        (e.g. USB and MMC devices).
 
                        Useful for devices that are detected asynchronously
                        (e.g. USB and MMC devices).
 

-       root_plug.vendor_id=
-                       [ROOTPLUG] Override the default vendor ID
-
-       root_plug.product_id=
-                       [ROOTPLUG] Override the default product ID
-
-       root_plug.debug=
-                       [ROOTPLUG] Enable debugging output
-

        rw              [KNL] Mount root device read-write on boot
 
        S               [KNL] Run init in single mode
        rw              [KNL] Mount root device read-write on boot
 
        S               [KNL] Run init in single mode


@@ -2114,6 +2200,8 @@ and is between 256 and 4096 characters. It is defined in the file
 
        sbni=           [NET] Granch SBNI12 leased line adapter
 
 
        sbni=           [NET] Granch SBNI12 leased line adapter
 

+       sched_debug     [KNL] Enables verbose scheduler debug messages.
+

        sc1200wdt=      [HW,WDT] SC1200 WDT (watchdog) driver
                        Format: <io>[,<timeout>[,<isapnp>]]
 
        sc1200wdt=      [HW,WDT] SC1200 WDT (watchdog) driver
                        Format: <io>[,<timeout>[,<isapnp>]]
 


@@ -2385,6 +2473,18 @@ and is between 256 and 4096 characters. It is defined in the file
        stifb=          [HW]
                        Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]]
 
        stifb=          [HW]
                        Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]]
 

+       sunrpc.min_resvport=
+       sunrpc.max_resvport=
+                       [NFS,SUNRPC]
+                       SunRPC servers often require that client requests
+                       originate from a privileged port (i.e. a port in the
+                       range 0 < portnr < 1024).
+                       An administrator who wishes to reserve some of these
+                       ports for other uses may adjust the range that the
+                       kernel's sunrpc client considers to be privileged
+                       using these two parameters to set the minimum and
+                       maximum port values.
+

        sunrpc.pool_mode=
                        [NFS]
                        Control how the NFS server code allocates CPUs to
        sunrpc.pool_mode=
                        [NFS]
                        Control how the NFS server code allocates CPUs to


@@ -2401,6 +2501,15 @@ and is between 256 and 4096 characters. It is defined in the file
                        pernode     one pool for each NUMA node (equivalent
                                    to global on non-NUMA machines)
 
                        pernode     one pool for each NUMA node (equivalent
                                    to global on non-NUMA machines)
 

+       sunrpc.tcp_slot_table_entries=
+       sunrpc.udp_slot_table_entries=
+                       [NFS,SUNRPC]
+                       Sets the upper limit on the number of simultaneous
+                       RPC calls that can be sent from the client to a
+                       server. Increasing these values may allow you to
+                       improve throughput, but will also increase the
+                       amount of memory reserved for use by the client.
+

        swiotlb=        [IA-64] Number of I/O TLB slabs
 
        switches=       [HW,M68k]
        swiotlb=        [IA-64] Number of I/O TLB slabs
 
        switches=       [HW,M68k]


@@ -2470,6 +2579,11 @@ and is between 256 and 4096 characters. It is defined in the file
        trace_buf_size=nn[KMG]
                        [FTRACE] will set tracing buffer size.
 
        trace_buf_size=nn[KMG]
                        [FTRACE] will set tracing buffer size.
 

+       trace_event=[event-list]
+                       [FTRACE] Set and start specified trace events in order
+                       to facilitate early boot debugging.
+                       See also Documentation/trace/events.txt
+

        trix=           [HW,OSS] MediaTrix AudioTrix Pro
                        Format:
                        <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>
        trix=           [HW,OSS] MediaTrix AudioTrix Pro
                        Format:
                        <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>


@@ -2496,6 +2610,9 @@ and is between 256 and 4096 characters. It is defined in the file
        uart6850=       [HW,OSS]
                        Format: <io>,<irq>
 
        uart6850=       [HW,OSS]
                        Format: <io>,<irq>
 

+       uhash_entries=  [KNL,NET]
+                       Set number of hash buckets for UDP/UDP-Lite connections
+

        uhci-hcd.ignore_oc=
                        [USB] Ignore overcurrent events (default N).
                        Some badly-designed motherboards generate lots of
        uhci-hcd.ignore_oc=
                        [USB] Ignore overcurrent events (default N).
                        Some badly-designed motherboards generate lots of


@@ -2551,6 +2668,8 @@ and is between 256 and 4096 characters. It is defined in the file
                        to a common usb-storage quirk flag as follows:
                                a = SANE_SENSE (collect more than 18 bytes
                                        of sense data);
                        to a common usb-storage quirk flag as follows:
                                a = SANE_SENSE (collect more than 18 bytes
                                        of sense data);

+                               b = BAD_SENSE (don't collect more than 18
+                                       bytes of sense data);

                                c = FIX_CAPACITY (decrease the reported
                                        device capacity by one sector);
                                h = CAPACITY_HEURISTICS (decrease the
                                c = FIX_CAPACITY (decrease the reported
                                        device capacity by one sector);
                                h = CAPACITY_HEURISTICS (decrease the


@@ -2610,6 +2729,11 @@ and is between 256 and 4096 characters. It is defined in the file
        vmpoff=         [KNL,S390] Perform z/VM CP command after power off.
                        Format: <command>
 
        vmpoff=         [KNL,S390] Perform z/VM CP command after power off.
                        Format: <command>
 

+       vt.cur_default= [VT] Default cursor shape.
+                       Format: 0xCCBBAA, where AA, BB, and CC are the same as
+                       the parameters of the <Esc>[?A;B;Cc escape sequence;
+                       see VGA-softcursor.txt. Default: 2 = underline.
+

        vt.default_blu= [VT]
                        Format: <blue0>,<blue1>,<blue2>,...,<blue15>
                        Change the default blue palette of the console.
        vt.default_blu= [VT]
                        Format: <blue0>,<blue1>,<blue2>,...,<blue15>
                        Change the default blue palette of the console.


@@ -2635,6 +2759,15 @@ and is between 256 and 4096 characters. It is defined in the file
                        Default is 1, i.e. UTF-8 mode is enabled for all
                        newly opened terminals.
 
                        Default is 1, i.e. UTF-8 mode is enabled for all
                        newly opened terminals.
 

+       vt.global_cursor_default=
+                       [VT]
+                       Format=<-1|0|1>
+                       Set system-wide default for whether a cursor
+                       is shown on new VTs. Default is -1,
+                       i.e. cursors will be created by default unless
+                       overridden by individual drivers. 0 will hide
+                       cursors, 1 will display them.
+

        waveartist=     [HW,OSS]
                        Format: <io>,<irq>,<dma>,<dma2>
 
        waveartist=     [HW,OSS]
                        Format: <io>,<irq>,<dma>,<dma2>