From: Jan Viktorin <viktorin@rehivetech.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>
Cc: Jerin Jacob <jerin.jacob@caviumnetworks.com>,
dev@dpdk.org, jianbo.liu@linaro.org
Subject: Re: [dpdk-dev] [PATCH] doc: arm64: document DPDK application profiling methods
Date: Tue, 4 Oct 2016 14:45:26 +0200 [thread overview]
Message-ID: <20161004144526.2bcb3fa6@pcviktorin.fit.vutbr.cz> (raw)
In-Reply-To: <1570506.0gxVEm9dQ5@xps13>
On Tue, 04 Oct 2016 14:40:47 +0200
Thomas Monjalon <thomas.monjalon@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@RehiveTech.com
System Architect Web: www.RehiveTech.com
RehiveTech
Brno, Czech Republic
next prev parent reply other threads:[~2016-10-04 12:48 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-04 10:40 Jerin Jacob
2016-10-04 12:40 ` Thomas Monjalon
2016-10-04 12:45 ` Jan Viktorin [this message]
2016-10-05 8:43 ` [dpdk-dev] [PATCH v2] " Jerin Jacob
2016-10-26 20:07 ` Thomas Monjalon
2016-11-03 12:30 ` Mcnamara, John
2016-11-04 14:00 ` Mcnamara, John
2016-11-08 3:32 ` [dpdk-dev] [PATCH v3] " Jerin Jacob
2016-11-08 5:57 ` Jianbo Liu
2016-11-10 23:41 ` Thomas Monjalon
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