From 7595afa4d30097c1177b69257118d8ad89a539be Mon Sep 17 00:00:00 2001 From: Christian Ehrhardt Date: Tue, 16 May 2017 14:51:32 +0200 Subject: Imported Upstream version 17.05 Change-Id: Id1e419c5a214e4a18739663b91f0f9a549f1fdc6 Signed-off-by: Christian Ehrhardt --- doc/guides/sample_app_ug/l3_forward_virtual.rst | 23 ++++++++--------------- 1 file changed, 8 insertions(+), 15 deletions(-) (limited to 'doc/guides/sample_app_ug/l3_forward_virtual.rst') diff --git a/doc/guides/sample_app_ug/l3_forward_virtual.rst b/doc/guides/sample_app_ug/l3_forward_virtual.rst index fa04722e..5f9d8948 100644 --- a/doc/guides/sample_app_ug/l3_forward_virtual.rst +++ b/doc/guides/sample_app_ug/l3_forward_virtual.rst @@ -110,40 +110,33 @@ where, * --no-numa: optional, disables numa awareness -For example, consider a dual processor socket platform where cores 0,2,4,6, 8, and 10 appear on socket 0, -while cores 1,3,5,7,9, and 11 appear on socket 1. -Let's say that the programmer wants to use memory from both NUMA nodes, -the platform has only two ports and the programmer wants to use one core from each processor socket to do the packet processing -since only one Rx/Tx queue pair can be used in virtualization mode. +For example, consider a dual processor socket platform with 8 physical cores, where cores 0-7 and 16-23 appear on socket 0, +while cores 8-15 and 24-31 appear on socket 1. -To enable L3 forwarding between two ports, using one core from each processor, -while also taking advantage of local memory accesses by optimizing around NUMA, -the programmer can pin to the appropriate cores and allocate memory from the appropriate NUMA node. -This is achieved using the following command: +To enable L3 forwarding between two ports, assuming that both ports are in the same socket, using two cores, cores 1 and 2, +(which are in the same socket too), use the following command: .. code-block:: console - ./build/l3fwd-vf -c 0x03 -n 3 -- -p 0x3 --config="(0,0,0),(1,0,1)" + ./build/l3fwd-vf -l 1,2 -n 4 -- -p 0x3 --config="(0,0,1),(1,0,2)" In this command: -* The -c option enables cores 0 and 1 +* The -l option enables cores 1 and 2 * The -p option enables ports 0 and 1 * The --config option enables one queue on each port and maps each (port,queue) pair to a specific core. - Logic to enable multiple RX queues using RSS and to allocate memory from the correct NUMA nodes - is included in the application and is done transparently. The following table shows the mapping in this example: +----------+-----------+-----------+------------------------------------+ | **Port** | **Queue** | **lcore** | **Description** | | | | | | +==========+===========+===========+====================================+ - | 0 | 0 | 0 | Map queue 0 from port 0 to lcore 0 | + | 0 | 0 | 1 | Map queue 0 from port 0 to lcore 1 | | | | | | +----------+-----------+-----------+------------------------------------+ - | 1 | 1 | 1 | Map queue 0 from port 1 to lcore 1 | + | 1 | 0 | 2 | Map queue 0 from port 1 to lcore 2 | | | | | | +----------+-----------+-----------+------------------------------------+ -- cgit 1.2.3-korg