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-rw-r--r--docs/release/userguide/feature.userguide.rst37
1 files changed, 37 insertions, 0 deletions
diff --git a/docs/release/userguide/feature.userguide.rst b/docs/release/userguide/feature.userguide.rst
index 2ecc4376..c1463e73 100644
--- a/docs/release/userguide/feature.userguide.rst
+++ b/docs/release/userguide/feature.userguide.rst
@@ -230,6 +230,17 @@ include:
</Event>
</Plugin>
+.. note:: Currently, the DPDK library doesn’t support API to de-initialize
+ the DPDK resources allocated on the initialization. It means, the collectd
+ plugin will not be able to release the allocated DPDK resources
+ (locks/memory/pci bindings etc.) correctly on collectd shutdown or reinitialize
+ the DPDK library if primary DPDK process is restarted. The only way to release
+ those resources is to terminate the process itself. For this reason, the plugin
+ forks off a separate collectd process. This child process becomes a secondary
+ DPDK process which can be run on specific CPU cores configured by user through
+ collectd configuration file (“Coremask” EAL configuration option, the
+ hexadecimal bitmask of the cores to run on).
+
For more information on the plugin parameters, please see:
https://github.com/collectd/collectd/blob/master/src/collectd.conf.pod
@@ -262,6 +273,24 @@ To fully enable ASLR:
For more information on multi-process support, please see:
http://dpdk.org/doc/guides/prog_guide/multi_proc_support.html
+**DPDK stats plugin limitations:**
+
+1. The DPDK primary process application should use the same version of DPDK
+ that collectd DPDK plugin is using;
+
+2. L2 statistics are only supported;
+
+3. The plugin has been tested on Intel NIC’s only.
+
+**DPDK stats known issues:**
+
+* DPDK port visibility
+
+ When network port controlled by Linux is bound to DPDK driver, the port
+ will not be available in the OS. It affects the SNMP write plugin as those
+ ports will not be present in standard IF-MIB. Thus addition work is
+ required to be done to support DPDK ports and statistics.
+
Hugepages Plugin
^^^^^^^^^^^^^^^^^
Repo: https://github.com/collectd/collectd
@@ -843,6 +872,14 @@ memAvailReal OID to value represented as free memory type of memory plugin:
</Data>
</Plugin>
+**Limitations**
+
+* Object instance with Counter64 type is not supported in SNMPv1. When GetNext
+ request is received, Counter64 type objects will be skipped. When Get
+ request is received for Counter64 type object, the error will be returned.
+* Interfaces that are not visible to Linux like DPDK interfaces cannot be
+ retreived using standard IF-MIB tables.
+
For more information on the plugin parameters, please see:
https://github.com/maryamtahhan/collectd/blob/feat_snmp/src/collectd.conf.pod