event/cnxk: add option to configure getwork mode

[dpdk.git] / doc / guides / prog_guide / profile_app.rst

diff --git a/doc/guides/prog_guide/profile_app.rst b/doc/guides/prog_guide/profile_app.rst
index 02f0561..52f85bb 100644 (file)
--- a/doc/guides/prog_guide/profile_app.rst
+++ b/doc/guides/prog_guide/profile_app.rst
@@ -36,9 +36,15 @@ for details about application profiling.
 Profiling with VTune
 ~~~~~~~~~~~~~~~~~~~~
 
-To allow VTune attaching to the DPDK application, reconfigure and recompile
-the DPDK with ``CONFIG_RTE_ETHDEV_RXTX_CALLBACKS`` and
-``CONFIG_RTE_ETHDEV_PROFILE_WITH_VTUNE`` enabled.
+To allow VTune attaching to the DPDK application, reconfigure a DPDK build
+folder by passing ``-Dc_args=-DRTE_ETHDEV_PROFILE_WITH_VTUNE`` meson option
+and recompile the DPDK:
+
+.. code-block:: console
+
+   meson build
+   meson configure build -Dc_args=-DRTE_ETHDEV_PROFILE_WITH_VTUNE
+   ninja -C build
 
 
 Profiling on ARM64
@@ -57,25 +63,29 @@ For more derails refer to the
 `ARM64 specific PMU events enumeration <http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.100095_0002_04_en/way1382543438508.html>`_.
 
 
-High-resolution cycle counter
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Low-resolution generic counter
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The default ``cntvct_el0`` based ``rte_rdtsc()`` provides a portable means to
-get a wall clock counter in user space. Typically it runs at <= 100MHz.
+get a wall clock counter in user space. Typically it runs at a lower clock frequency than the CPU clock frequency.
+Cycles counted using this method should be scaled to CPU clock frequency.
+
+
+High-resolution cycle counter
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The alternative method to enable ``rte_rdtsc()`` for a high resolution wall
-clock counter is through the armv8 PMU subsystem. The PMU cycle counter runs
+clock counter is through the ARMv8 PMU subsystem. The PMU cycle counter runs
 at CPU frequency. However, access to the PMU cycle counter from user space is
 not enabled by default in the arm64 linux kernel. It is possible to enable
 cycle counter for user space access by configuring the PMU from the privileged
 mode (kernel space).
 
 By default the ``rte_rdtsc()`` implementation uses a portable ``cntvct_el0``
-scheme.  Application can choose the PMU based implementation with
-``CONFIG_RTE_ARM_EAL_RDTSC_USE_PMU``.
+scheme.
 
 The example below shows the steps to configure the PMU based cycle counter on
-an armv8 machine.
+an ARMv8 machine.
 
 .. code-block:: console
 
@@ -83,10 +93,8 @@ an armv8 machine.
     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
+
+Please refer to :doc:`../linux_gsg/build_dpdk` for details on compiling DPDK with meson.
 
 .. warning::