bus/fslmc: add QBMAN API to do enqueue with multiple frames

[dpdk.git] / doc / guides / linux_gsg / enable_func.rst

diff --git a/doc/guides/linux_gsg/enable_func.rst b/doc/guides/linux_gsg/enable_func.rst
index 076770f..5ac0184 100644 (file)
--- a/doc/guides/linux_gsg/enable_func.rst
+++ b/doc/guides/linux_gsg/enable_func.rst
@@ -35,8 +35,8 @@ Enabling Additional Functionality
 
 .. _High_Precision_Event_Timer:
 
 
 .. _High_Precision_Event_Timer:
 

-High Precision Event Timer HPET) Functionality
-----------------------------------------------
+High Precision Event Timer (HPET) Functionality
+-----------------------------------------------

 
 BIOS Support
 ~~~~~~~~~~~~
 
 BIOS Support
 ~~~~~~~~~~~~


@@ -87,6 +87,14 @@ The application can then determine what action to take, if any, if the HPET is n
 Running DPDK Applications Without Root Privileges
 --------------------------------------------------------
 
 Running DPDK Applications Without Root Privileges
 --------------------------------------------------------
 

+.. note::
+
+    The instructions below will allow running DPDK as non-root with older
+    Linux kernel versions. However, since version 4.0, the kernel does not allow
+    unprivileged processes to read the physical address information from
+    the pagemaps file, making it impossible for those processes to use HW
+    devices which require physical addresses
+

 Although applications using the DPDK use network ports and other hardware resources directly,
 with a number of small permission adjustments it is possible to run these applications as a user other than "root".
 To do so, the ownership, or permissions, on the following Linux file system objects should be adjusted to ensure that
 Although applications using the DPDK use network ports and other hardware resources directly,
 with a number of small permission adjustments it is possible to run these applications as a user other than "root".
 To do so, the ownership, or permissions, on the following Linux file system objects should be adjusted to ensure that


@@ -176,43 +184,3 @@ Also, if ``INTEL_IOMMU_DEFAULT_ON`` is not set in the kernel, the ``intel_iommu=
 This ensures that the Intel IOMMU is being initialized as expected.
 
 Please note that while using ``iommu=pt`` is compulsory for ``igb_uio driver``, the ``vfio-pci`` driver can actually work with both ``iommu=pt`` and ``iommu=on``.
 This ensures that the Intel IOMMU is being initialized as expected.
 
 Please note that while using ``iommu=pt`` is compulsory for ``igb_uio driver``, the ``vfio-pci`` driver can actually work with both ``iommu=pt`` and ``iommu=on``.

-
-High Performance of Small Packets on 40G NIC
---------------------------------------------
-
-As there might be firmware fixes for performance enhancement in latest version
-of firmware image, the firmware update might be needed for getting high performance.
-Check with the local Intel's Network Division application engineers for firmware updates.
-The base driver to support firmware version of FVL3E will be integrated in the next
-DPDK release, so currently the validated firmware version is 4.2.6.
-
-Enabling Extended Tag
-~~~~~~~~~~~~~~~~~~~~~
-
-PCI configuration of ``extended_tag`` has big impact on small packet size
-performance of 40G ports. Enabling ``extended_tag`` can help 40G port to
-achieve the best performance, especially for small packet size.
-
-* Disabling/enabling ``extended_tag`` can be done in some BIOS implementations.
-
-* If BIOS does not enable it, and does not support changing it, tools
-  (e.g. ``setpci`` on Linux) can be used to enable or disable ``extended_tag``.
-
-* From release 16.04, ``extended_tag`` is enabled by default during port
-  initialization, users don't need to care about that anymore.
-
-Use 16 Bytes RX Descriptor Size
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-As i40e PMD supports both 16 and 32 bytes RX descriptor sizes, and 16 bytes size can provide helps to high performance of small packets.
-Configuration of ``CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC`` in config files can be changed to use 16 bytes size RX descriptors.
-
-High Performance and per Packet Latency Tradeoff
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-Due to the hardware design, the interrupt signal inside NIC is needed for per
-packet descriptor write-back. The minimum interval of interrupts could be set
-at compile time by ``CONFIG_RTE_LIBRTE_I40E_ITR_INTERVAL`` in configuration files.
-Though there is a default configuration, the interval could be tuned by the
-users with that configuration item depends on what the user cares about more,
-performance or per packet latency.