X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=doc%2Fguides%2Flinux_gsg%2Fsys_reqs.rst;h=3e7fe6373bbbcd3f5113ca015474e62405fd4168;hb=6b663dae3f7d0bc0e1f3f35f1ae561ab72f276cb;hp=61222c699b7d57f8d22781875e741fd3289c25f7;hpb=d76a592782c1291b19f74a8ec29bcbd40b5170cd;p=dpdk.git diff --git a/doc/guides/linux_gsg/sys_reqs.rst b/doc/guides/linux_gsg/sys_reqs.rst index 61222c699b..3e7fe6373b 100644 --- a/doc/guides/linux_gsg/sys_reqs.rst +++ b/doc/guides/linux_gsg/sys_reqs.rst @@ -43,14 +43,21 @@ BIOS Setting Prerequisite on x86 For the majority of platforms, no special BIOS settings are needed to use basic DPDK functionality. However, for additional HPET timer and power management functionality, -and high performance of small packets on 40G NIC, BIOS setting changes may be needed. +and high performance of small packets, BIOS setting changes may be needed. Consult the section on :ref:`Enabling Additional Functionality ` for more information on the required changes. +.. note:: + + If UEFI secure boot is enabled, the Linux kernel may disallow the use of + UIO on the system. Therefore, devices for use by DPDK should be bound to the + ``vfio-pci`` kernel module rather than ``igb_uio`` or ``uio_pci_generic``. + For more details see :ref:`linux_gsg_binding_kernel`. + Compilation of the DPDK ----------------------- -**Required Tools:** +**Required Tools and Libraries:** .. note:: @@ -84,6 +91,8 @@ Compilation of the DPDK x86_x32 ABI is currently supported with distribution packages only on Ubuntu higher than 13.10 or recent Debian distribution. The only supported compiler is gcc 4.9+. +* libnuma-devel - library for handling NUMA (Non Uniform Memory Access). + * Python, version 2.7+ or 3.2+, to use various helper scripts included in the DPDK package. @@ -129,8 +138,6 @@ System Software For other kernel builds, options which should be enabled for DPDK include: - * UIO support - * HUGETLBFS * PROC_PAGE_MONITOR support @@ -200,6 +207,12 @@ On a NUMA machine, pages should be allocated explicitly on separate nodes:: For 1G pages, it is not possible to reserve the hugepage memory after the system has booted. + On IBM POWER system, the nr_overcommit_hugepages should be set to the same value as nr_hugepages. + For example, if the required page number is 128, the following commands are used:: + + echo 128 > /sys/kernel/mm/hugepages/hugepages-16384kB/nr_hugepages + echo 128 > /sys/kernel/mm/hugepages/hugepages-16384kB/nr_overcommit_hugepages + Using Hugepages with the DPDK ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -215,56 +228,3 @@ The mount point can be made permanent across reboots, by adding the following li For 1GB pages, the page size must be specified as a mount option:: nodev /mnt/huge_1GB hugetlbfs pagesize=1GB 0 0 - -Xen Domain0 Support in the Linux Environment -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The existing memory management implementation is based on the Linux kernel hugepage mechanism. -On the Xen hypervisor, hugepage support for DomainU (DomU) Guests means that DPDK applications work as normal for guests. - -However, Domain0 (Dom0) does not support hugepages. -To work around this limitation, a new kernel module rte_dom0_mm is added to facilitate the allocation and mapping of memory via -**IOCTL** (allocation) and **MMAP** (mapping). - -Enabling Xen Dom0 Mode in the DPDK -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -By default, Xen Dom0 mode is disabled in the DPDK build configuration files. -To support Xen Dom0, the CONFIG_RTE_LIBRTE_XEN_DOM0 setting should be changed to “y”, which enables the Xen Dom0 mode at compile time. - -Furthermore, the CONFIG_RTE_EAL_ALLOW_INV_SOCKET_ID setting should also be changed to “y” in the case of the wrong socket ID being received. - -Loading the DPDK rte_dom0_mm Module -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -To run any DPDK application on Xen Dom0, the ``rte_dom0_mm`` module must be loaded into the running kernel with rsv_memsize option. -The module is found in the kmod sub-directory of the DPDK target directory. -This module should be loaded using the insmod command as shown below (assuming that the current directory is the DPDK target directory):: - - sudo insmod kmod/rte_dom0_mm.ko rsv_memsize=X - -The value X cannot be greater than 4096(MB). - -Configuring Memory for DPDK Use -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -After the rte_dom0_mm.ko kernel module has been loaded, the user must configure the memory size for DPDK usage. -This is done by echoing the memory size to a memsize file in the /sys/devices/ directory. -Use the following command (assuming that 2048 MB is required):: - - echo 2048 > /sys/kernel/mm/dom0-mm/memsize-mB/memsize - -The user can also check how much memory has already been used:: - - cat /sys/kernel/mm/dom0-mm/memsize-mB/memsize_rsvd - -Xen Domain0 does not support NUMA configuration, as a result the ``--socket-mem`` command line option is invalid for Xen Domain0. - -.. note:: - - The memsize value cannot be greater than the rsv_memsize value. - -Running the DPDK Application on Xen Domain0 -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -To run the DPDK application on Xen Domain0, an extra command line option ``--xen-dom0`` is required.