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* [dpdk-stable] [PATCH 4/4] event/dlb2: add missing sections to documentation
@ 2020-11-05 21:22 Timothy McDaniel
  2020-11-05 21:22 ` [dpdk-stable] [PATCH 3/4] event/dlb2: fix dereference NULL pointer Coverity warning Timothy McDaniel
                   ` (2 more replies)
  0 siblings, 3 replies; 6+ messages in thread
From: Timothy McDaniel @ 2020-11-05 21:22 UTC (permalink / raw)
  Cc: dev, erik.g.carrillo, gage.eads, harry.van.haaren, jerinj,
	john.mcnamara, stable

Add queue depth threshold and class of service sections
to DLB2 rst file.

Fixes:5433956 ("event/dlb2: add eventdev probe")
Cc: stable@dpdk.org

Signed-off-by: Timothy McDaniel <timothy.mcdaniel@intel.com>
---
 doc/guides/eventdevs/dlb2.rst | 47 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/doc/guides/eventdevs/dlb2.rst b/doc/guides/eventdevs/dlb2.rst
index b9f57fd..159f36c 100644
--- a/doc/guides/eventdevs/dlb2.rst
+++ b/doc/guides/eventdevs/dlb2.rst
@@ -363,3 +363,50 @@ increase a vdev's per-queue atomic-inflight allocation to (for example) 64:
 
        --vdev=dlb1_event,atm_inflights=64
 
+QID Depth Threshold
+~~~~~~~~~~~~~~~~~~~
+
+DLB2 supports setting and tracking queue depth thresholds. Hardware uses
+the thresholds to track how full a queue is compared to its threshold.
+Four buckets are used
+
+- Less than or equal to 50% of queue depth threshold
+- Greater than 50%, but less than or equal to 75% of depth threshold
+- Greater than 75%, but less than or equal to 100% of depth threshold
+- Greater than 100% of depth thresholds
+
+Per queue threshold metrics are tracked in the DLB2 xstats, and are also
+returned in the impl_opaque field of each received event.
+
+The per qid threshold can be specified as part of the device args, and
+can be applied to all queue, a range of queues, or a single queue, as
+shown below.
+
+    .. code-block:: console
+
+       --vdev=dlb2_event,qid_depth_thresh=all:<threshold_value>
+       --vdev=dlb2_event,qid_depth_thresh=qidA-qidB:<threshold_value>
+       --vdev=dlb2_event,qid_depth_thresh=qid:<threshold_value>
+
+Class of service
+~~~~~~~~~~~~~~~~
+
+DLB2 supports provisioning the DLB2 bandwidth into 4 classes of service.
+
+- Class 4 corresponds to 40% of the DLB2 hardware bandwidth
+- Class 3 corresponds to 30% of the DLB2 hardware bandwidth
+- Class 2 corresponds to 20% of the DLB2 hardware bandwidth
+- Class 1 corresponds to 10% of the DLB2 hardware bandwidth
+- Class 0 corresponds to don't care
+
+The classes are applied globally to the set of ports contained in this
+scheduling domain, which is more appropriate for the bifurcated
+PMD than for the PF PMD, since the PF PMD supports just 1 scheduling
+domain.
+
+Class of service can be specified in the devargs, as follows
+
+    .. code-block:: console
+
+       --vdev=dlb2_event,cos=<0..4>
+
-- 
2.6.4


^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2020-11-10 15:44 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-11-05 21:22 [dpdk-stable] [PATCH 4/4] event/dlb2: add missing sections to documentation Timothy McDaniel
2020-11-05 21:22 ` [dpdk-stable] [PATCH 3/4] event/dlb2: fix dereference NULL pointer Coverity warning Timothy McDaniel
2020-11-05 21:22 ` [dpdk-stable] [PATCH 1/4] event/dlb: fix memory overrun " Timothy McDaniel
2020-11-10 15:36   ` [dpdk-stable] [dpdk-dev] " Jerin Jacob
2020-11-10 15:44     ` McDaniel, Timothy
2020-11-05 21:22 ` [dpdk-stable] [PATCH 2/4] event/dlb: fix no-effect " Timothy McDaniel

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