longrun(1) [redhat man page]

LONGRUN(1)						      General Commands Manual							LONGRUN(1)

NAME

       Transmeta(TM) Crusoe(TM) LongRun(TM) utility

SYNOPSIS

       longrun [-c device] [-m device] [-hlpv] [-f flag] [-s low high]

DESCRIPTION

       The longrun utility is used to control and query LongRun settings on Transmeta Crusoe processors.

       -c device
	      Set the CPUID device.  The default CPUID device is /dev/cpu/0/cpuid.

       -m device
	      Set the MSR device.  The default CPUID device is /dev/cpu/0/msr.

       -h     Print help.

       -l     List LongRun information about available performance levels for the CPU.

	      The following values are reported on all Transmeta CPUs that implement LongRun.

		 %	An  available  performance  level, expressed as a percentage of range of available core CPU frequencies.  0 corresponds to
			the lowest available frequency and 100 corresponds to the highest.

		 MHz	The core CPU frequency at that level.

		 Volts	The core CPU voltage at that level.

		 usage	The power usage relative to the maximum performance level.

       -p     Print current LongRun settings and status: whether LongRun is enabled, whether LongRun Thermal Extensions are  active,  the  current
	      LongRun performance window (expressed as a percentile range), the current LongRun performance level (expressed as a percentile), and
	      the current LongRun flags.

       -v     Be more verbose.

       -f flag
	      Set a LongRun mode flag.	Currently, the two supported flags are performance and economy.  This controls whether the processor is in
	      "performance mode" or "economy mode".

       -s low high
	      Set  the	current  LongRun  performance  window  as a percentile range.  The low number cannot be greater than the high number.  The
	      minimum and maximum performance values accepted by the CPU are 0 and 100, respectively.

ENVIRONMENT

       No environment variables are used.

FILES

       This program requires that the Linux CPUID and MSR devices be compiled into the kernel (or  loaded  as  kernel  modules),  that	the  CPUID
       character device be readable, and that the MSR character device be both readable and writable.

SEE ALSO

       acpid(8), apmd(8), hdparm(8)

AUTHOR

       Daniel Quinlan <quinlan@transmeta.com>

								 February 14, 2001							LONGRUN(1)

X86_ENERGY_PERF_POLICY(8)				      System Manager's Manual					 X86_ENERGY_PERF_POLICY(8)

NAME

       x86_energy_perf_policy - read or write MSR_IA32_ENERGY_PERF_BIAS

SYNOPSIS

       x86_energy_perf_policy [-c cpu] [-v] -r
       x86_energy_perf_policy [-c cpu] [-v] 'performance'
       x86_energy_perf_policy [-c cpu] [-v] 'normal'
       x86_energy_perf_policy [-c cpu] [-v] 'powersave'
       x86_energy_perf_policy [-c cpu] [-v] n

DESCRIPTION

       x86_energy_perf_policy allows software to convey its policy for the relative importance of performance versus energy savings to the proces-
       sor.

       The processor uses this information in model-specific ways when it must select trade-offs between performance and energy efficiency.

       This policy hint does not supersede Processor Performance states (P-states) or CPU Idle power states (C-states),  but  allows  software	to
       have influence where it would otherwise be unable to express a preference.

       For  example,  this  setting  may  tell the hardware how aggressively or conservatively to control frequency in the "turbo range" above the
       explicitly OS-controlled P-state frequency range.  It may also tell the hardware how aggressively is  should  enter  the  OS  requested	C-
       states.

       Support for this feature is indicated by CPUID.06H.ECX.bit3 per the Intel Architectures Software Developer's Manual.

   Options
       -c  limits  operation  to a single CPU.	The default is to operate on all CPUs.	Note that MSR_IA32_ENERGY_PERF_BIAS is defined per logical
       processor, but that the initial implementations of the MSR were shared among all processors in each package.

       -v increases verbosity.	By default x86_energy_perf_policy is silent.

       -r is for "read-only" mode - the unchanged state is read and displayed.

       performance Set a policy where performance is paramount.  The processor will be unwilling to sacrifice any  performance	for  the  sake	of
       energy saving. This is the hardware default.

       normal Set a policy with a normal balance between performance and energy efficiency.  The processor will tolerate minor performance compro-
       mise for potentially significant energy savings.  This reasonable default for most desktops and servers.

       powersave Set a policy where the processor can accept a measurable performance hit to maximize energy efficiency.

       n Set MSR_IA32_ENERGY_PERF_BIAS to the specified number.  The range of valid numbers is 0-15, where 0 is maximum performance and 15 is max-
       imum energy efficiency.

NOTES

       x86_energy_perf_policy runs only as root.

FILES

       /dev/cpu/*/msr

SEE ALSO

       msr(4)

AUTHORS

       Written by Len Brown <len.brown@intel.com>

															 X86_ENERGY_PERF_POLICY(8)