* [PATCH v2] doc: update DLB2 documentation
@ 2022-09-27 0:10 Abdullah Sevincer
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From: Abdullah Sevincer @ 2022-09-27 0:10 UTC (permalink / raw)
To: dev
Cc: jerinj, rashmi.shetty, pravin.pathak, mike.ximing.chen,
timothy.mcdaniel, shivani.doneria, tirthendu.sarkar,
Abdullah Sevincer
This commit updates the dlb2.rst eventdev guide to document a
new devarg. A new devarg: "default_port_allocation" added
to allow default ldb port allocation scheme.
Signed-off-by: Abdullah Sevincer <abdullah.sevincer@intel.com>
---
doc/guides/eventdevs/dlb2.rst | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/doc/guides/eventdevs/dlb2.rst b/doc/guides/eventdevs/dlb2.rst
index 5b21f13b68..2a0bdacfbd 100644
--- a/doc/guides/eventdevs/dlb2.rst
+++ b/doc/guides/eventdevs/dlb2.rst
@@ -414,3 +414,22 @@ Note that the weight may not exceed the maximum CQ depth.
--allow ea:00.0,cq_weight=all:<weight>
--allow ea:00.0,cq_weight=qidA-qidB:<weight>
--allow ea:00.0,cq_weight=qid:<weight>
+
+Default LDB Port Allocation
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+For optimal load balancing ports that map to one or more QIDs in common
+should not be in numerical sequence. The port->QID mapping is application
+dependent, but the driver interleaves port IDs as much as possible to
+reduce the likelihood of sequential ports mapping to the same QID(s).
+
+Hence, DLB uses an initial allocation of Port IDs to maximize the
+average distance between an ID and its immediate neighbors. (i.e.the
+distance from 1 to 0 and to 2, the distance from 2 to 1 and to 3, etc.).
+Initial port allocation option can be passed through devarg. If y (or Y)
+inial port allocation will be used, otherwise initial port allocation
+won't be used.
+
+ .. code-block:: console
+
+ --allow ea:00.0,default_port_allocation=<y/Y>
--
2.25.1
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2022-09-27 0:10 [PATCH v2] doc: update DLB2 documentation Abdullah Sevincer
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