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Configuring kernel parameters

Miscellaneous parameters

Parameter Dflt Min Max
ARG_MAX 10240 10240 1048576
FPKIND 0 0 3
INITFILE /etc/inittab    
MAXLINK 1000 1000 32767
MSETIMEOUT 60 10 100
NULLPTR 1 0 2
PRFMAX 4096 2048 10240
PROCTLLID 2 1 8
PUTBUFSZ 2000 2000 10000
SANITYCLK 0 0 1
SHLBMAX 3 2 6
SYSDUMP_SELECTIVE 1 0 2
SYSDUMP_ABORT_VERIFY 1 0 1
USER_RDPMC 0 0 1
USER_RDTSC 0 0 1
WS_MAXSTATION 17 1 17


ARG_MAX
This is the maximum number of characters (including NUL characters) allowed in the argument and environment strings passed to an exec system call. This can be increased to allow larger argument lists.

FPKIND
Type of floating-point support: ``0''=auto-detect, ``1''=software emulator, ``2''=Intel 287 coprocessor, ``3''=Intel 387 coprocessor.

INITFILE
Specifies the file to use as input to /sbin/init (default is /etc/inittab).

MAXLINK
Specifies the maximum number of links (directory entries) permitted in a single directory. Do not attempt to increase this value beyond ``32767''.

MSETIMEOUT
Specifies the timing window for the emulation of the middle mouse button on a 2 button mouse. The range is from 10ms to 100ms. If the user presses the left mouse button and the right mouse button within this timing window, a middle button event is generated.

NULLPTR
Controls the default state of the null pointer workaround and whether logging should occur. When the value is ``0'', the workaround is disabled by default, and logging is disabled; when the value is ``1'', the workaround is enabled by default, and logging is disabled; when the value if ``2'', the workaround is enabled by default, and logging is enabled.

When the workaround is enabled, null pointer reads return zero instead of faulting with SIGSEGV. When logging is enabled and the workaround is enabled for a process, the first time an executable program in that process reads a null pointer, a message is sent to the console.


PRFMAX
Maximum number of kernel symbols for which the kernel profiler has space allocated.

PROCTLLID
Specifies the Level ID when you use MAC (Mandatory Access Control) for the control file in the processor filesystem.

PUTBUFSZ
Specifies the size of a circular buffer, putbuf, that is used to contain a copy of the last PUTBUFSZ characters written to the console by the operating system. The contents of putbuf can be viewed using the crash(ADM) command panic option, or from kdb using putbuf number of characters dump.

SANITYCLK
Enable sanity clock on machines that support this feature.

SHLBMAX
Specifies the maximum number of static shared libraries that can be attached to a process at one time.

SYSDUMP_SELECTIVE
This parameter controls the size and type of information stored in a system memory dump. If the value is ``0'', then both kernel and user mapped memory are dumped (assuming the dump slice is large enough). If the value is ``1'', then only kernel mapped memory is dumped. If the value is ``2'', only a selected portion of kernel mapped memory pages are dumped. The crash(ADM) command is used to examine the dumped system images.

SYSDUMP_ABORT_VERIFY
If set to ``1'', a prompt is issued which requires you to enter ``yes'' (case insensitive) to abort a dump. Pressing <Enter> instead of entering ``yes'' causes dump processing to continue. If set to ``0'', any key pressed during the dump processing will abort the dump.

USER_RDPMC
When non-zero, the user can use the rdpmc instruction, if available.

USER_RDTSC
When non-zero, the user can use the rdtsc instruction, if available.

WS_MAXSTATION
Maximum number of workstations.

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© 2007 The SCO Group, Inc. All rights reserved.
SCO OpenServer Release 6.0.0 -- 05 June 2007