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Diffstat (limited to 'doc/guides/linux_gsg/sys_reqs.rst')
| -rw-r--r-- | doc/guides/linux_gsg/sys_reqs.rst | 53 |
1 files changed, 0 insertions, 53 deletions
diff --git a/doc/guides/linux_gsg/sys_reqs.rst b/doc/guides/linux_gsg/sys_reqs.rst index eb8442c6..3e7fe637 100644 --- a/doc/guides/linux_gsg/sys_reqs.rst +++ b/doc/guides/linux_gsg/sys_reqs.rst @@ -228,56 +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. |