On Tue, 04 Oct 2016 14:40:47 +0200 Thomas Monjalon <thomas.monjalon at 6wind.com> wrote:
> Thanks for providing a patch so quickly :) > > 2016-10-04 16:10, Jerin Jacob: > > +The PMU based scheme useful for high accuracy performance profiling. > > A verb is missing. > > > +Find below the example steps to configure the PMU based cycle counter on an > > +armv8 machine. > > + > > +.. code-block:: console > > + > > + git clone https://github.com/jerinjacobk/armv8_pmu_cycle_counter_el0 > > + cd armv8_pmu_cycle_counter_el0 > > + make > > + sudo insmod pmu_el0_cycle_counter.ko > > + cd $DPDK_DIR > > + make config T=arm64-armv8a-linuxapp-gcc > > + echo "CONFIG_RTE_ARM_EAL_RDTSC_USE_PMU=y" >> build/.config > > + make > > What about the ARM 32 code that Jan is using? Hi, I didn't have time for this yet. The basic description is here: lib/librte_eal/common/include/arch/arm/rte_cycles_32.h In the Linux Kernel, it is used here: arch/arm/kernel/perf_event_v7.c (see registers c12, c13 and c14) Regards Jan > > > +.. warning:: > > + > > + This method can not be used in production systems as this may alter PMU > > + state used by standard Linux user space tool like perf. > > More details please? > -- Jan Viktorin E-mail: Viktorin at RehiveTech.com System Architect Web: www.RehiveTech.com RehiveTech Brno, Czech Republic
