Dst - V 3.6.3

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LEARN ABOUT OSX

hwprefs

HWPREFS(1)						    BSD General Commands Manual 						HWPREFS(1)

NAME

     hwprefs -- inspect and control low-level system and processor parameters

SYNOPSIS

     hwprefs [-v] [-h] [cpu_count={1..N}] [cpu_enable {1..N}] [cpu_disable {1..N}] [cpu_l2_cache={true, false}] [cpu_l3_cache={true, false}]
	     [cpu_nap={true, false}] [cpu_hwprefetch={0, 4, 8}] [cpu_nop_dsts={true, false}] [memctl_readbypass={true, false}] [os_class]
	     [os_type] [machine_type] [memory_size] [cpu_type] [cpu_freq] [cpu_bus_freq] [memctl_type] [ioctl_type"]

DESCRIPTION

     hwprefs inspects and controls low-level system and processor parameters

     -v       verbose mode

     -h       display help message

     cpu_count={1..N}
	      number of processors available for use by MacOS X

     cpu_enable {1..N}
	      enable a specific processor

     cpu_disable {1..N}
	      disable a specific processor

     cpu_nap={true, false}
	      processor nap

     cpu_l2_cache={true, false}
	      processor L2 cache

     cpu_l3_cache={true, false}
	      processor L3 cache

     cpu_hwprefetch={0, 4, 8}
	      prefetch engines used by hardware prefetcher (PPC970 only):

	      0 - all prefetch engines disabled, DST instructions treated as NOPs

	      4 - four automatic hardware prefetch engines, four used by DST instructions

	      8 - eight automatic hardware prefetch engines, DST instructions treated as NOPs

     cpu_nop_dsts={true, false}
	      treat DST instructions as nops

     memctl_readbypass={true, false}
	      memory controller (U3 only) read-bypass optimization (allows read commands to memory to bypass straight to read memory request
	      queue, saving a significant number of cycles)

     os_class
	      displays OS class {Cheetah, Puma, Jaguar, Smeagol, Panther, Tiger}

     os_type  displays operating system type

     machine_type
	      displays machine type

     memory_size
	      displays system memory

     cpu_type
	      displays processor type and version

     cpu_freq
	      displays processor clock frequency

     cpu_bus_freq
	      displays processor bus frequency

     memctl_type
	      displays memory controller type

     ioctl_type
	      displays io controller type

Darwin								 December 21, 2005							    Darwin

SCO