update source to Ceph Pacific 16.2.2

[ceph.git] / ceph / src / spdk / dpdk / doc / guides / prog_guide / mempool_lib.rst

diff --git a/ceph/src/spdk/dpdk/doc/guides/prog_guide/mempool_lib.rst b/ceph/src/spdk/dpdk/doc/guides/prog_guide/mempool_lib.rst
index 52a569f5766ae5a7a70c3cac7c68b8cabe61d133..f8b430d6564daf538052b42b56f66e0f83618b11 100644 (file)
--- a/ceph/src/spdk/dpdk/doc/guides/prog_guide/mempool_lib.rst
+++ b/ceph/src/spdk/dpdk/doc/guides/prog_guide/mempool_lib.rst
@@ -27,10 +27,10 @@ In debug mode (CONFIG_RTE_LIBRTE_MEMPOOL_DEBUG is enabled),
 statistics about get from/put in the pool are stored in the mempool structure.
 Statistics are per-lcore to avoid concurrent access to statistics counters.
 
-Memory Alignment Constraints
-----------------------------
+Memory Alignment Constraints on x86 architecture
+------------------------------------------------
 
-Depending on hardware memory configuration, performance can be greatly improved by adding a specific padding between objects.
+Depending on hardware memory configuration on X86 architecture, performance can be greatly improved by adding a specific padding between objects.
 The objective is to ensure that the beginning of each object starts on a different channel and rank in memory so that all channels are equally loaded.
 
 This is particularly true for packet buffers when doing L3 forwarding or flow classification.
@@ -133,6 +133,14 @@ For applications that use ``rte_pktmbuf_create()``, there is a config setting
 (``RTE_MBUF_DEFAULT_MEMPOOL_OPS``) that allows the application to make use of
 an alternative mempool handler.
 
+  .. note::
+
+    When running a DPDK application with shared libraries, mempool handler
+    shared objects specified with the '-d' EAL command-line parameter are
+    dynamically loaded. When running a multi-process application with shared
+    libraries, the -d arguments for mempool handlers *must be specified in the
+    same order for all processes* to ensure correct operation.
+
 
 Use Cases
 ---------