xenial (1) likwid-features.1.gz
NAME
likwid-features - print and toggle the flags of the MSR_IA32_MISC_ENABLE model specific register
SYNOPSIS
likwid-features [-vh] [-c <coreId>] [-s <prefetcher_tag>] [-u <prefetcher_tag>]
DESCRIPTION
likwid-features is a command line application to print the flags in the model specific register (MSR)
MSR_IA32_MISC_ENABLE on Intel x86 processors. On Core2 processors it can be used to toggle the hardware
prefetch flags. It does not work on AMD processors. For a documentation what flags are supported on
which processor refer to the Intel Software Developer's Manual Volume 3B, Table B.2. The MSR are set
individually for every core. The following hardware prefetchers can be toggled:
• HW_PREFETCHER: Hardware prefetcher.
• CL_PREFETCHER: Adjacent cache line prefetcher.
• DCU_PREFETCHER: When the DCU prefetcher detects multiple loads from the same line done within a
time limit, the DCU prefetcher assumes the next line will be required. The next line is prefetched
in to the L1 data cache from memory or L2.
• IP_PREFETCHER: The IP prefetcher is an L1 data cache prefetcher. The IP prefetcher looks for
sequential load history to determine whether to prefetch the next expected data into the L1 cache
from memory or L2.
OPTIONS
-v prints version information to standard output, then exits.
-h prints a help message to standard output, then exits.
-c <coreId>
set on which processor core the MSR should be read
-u <HW_PREFETCHER | CL_PREFETCHER | DCU_PREFETCHER | IP_PREFETCHER>
specify which prefetcher to unset
-s <HW_PREFETCHER | CL_PREFETCHER | DCU_PREFETCHER | IP_PREFETCHER>
specify which prefetcher to set
AUTHOR
Written by Jan Treibig <jan.treibig@gmail.com>.
BUGS
Report Bugs on <http://code.google.com/p/likwid/issues/list>.
SEE ALSO
likwid-perfctr(1), likwid-pin(1), likwid-powermeter(1), likwid-topology(1), likwid-setFrequencies(1)