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authorChristian Ehrhardt <christian.ehrhardt@canonical.com>2017-05-16 14:51:32 +0200
committerChristian Ehrhardt <christian.ehrhardt@canonical.com>2017-05-16 16:20:45 +0200
commit7595afa4d30097c1177b69257118d8ad89a539be (patch)
tree4bfeadc905c977e45e54a90c42330553b8942e4e /doc/guides/sample_app_ug/l3_forward_virtual.rst
parentce3d555e43e3795b5d9507fcfc76b7a0a92fd0d6 (diff)
Imported Upstream version 17.05
Change-Id: Id1e419c5a214e4a18739663b91f0f9a549f1fdc6 Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Diffstat (limited to 'doc/guides/sample_app_ug/l3_forward_virtual.rst')
-rw-r--r--doc/guides/sample_app_ug/l3_forward_virtual.rst23
1 files changed, 8 insertions, 15 deletions
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 |
| | | | |
+----------+-----------+-----------+------------------------------------+