[PATCH v6 2/2] examples/l3fwd-power: add PM QoS configuration

[Huisong Li]

Add PM QoS configuration to declease the delay after sleep in case of
entering deeper idle state.

Signed-off-by: Huisong Li <lihuis...@huawei.com>
Acked-by: Morten Brørup <m...@smartsharesystems.com>
---
 examples/l3fwd-power/main.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
index fba11da7ca..74a07afc6c 100644
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -47,6 +47,7 @@
 #include <rte_telemetry.h>
 #include <rte_power_pmd_mgmt.h>
 #include <rte_power_uncore.h>
+#include <rte_power_qos.h>
 
 #include "perf_core.h"
 #include "main.h"
@@ -2259,6 +2260,24 @@ init_power_library(void)
                        return -1;
                }
        }
+
+       RTE_LCORE_FOREACH(lcore_id) {
+               if (rte_lcore_is_enabled(lcore_id) == 0)
+                       continue;
+               /*
+                * Set the worker lcore's to have strict latency limit to allow
+                * the CPU to enter the shallowest idle state.
+                */
+               ret = rte_power_qos_set_cpu_resume_latency(lcore_id,
+                                       RTE_POWER_QOS_STRICT_LATENCY_VALUE);
+               if (ret < 0) {
+                       RTE_LOG(ERR, L3FWD_POWER,
+                               "Failed to set strict resume latency on 
CPU%u.\n",
+                               lcore_id);
+                       return ret;
+               }
+       }
+
        return ret;
 }
 
@@ -2298,6 +2317,15 @@ deinit_power_library(void)
                        }
                }
        }
+
+       RTE_LCORE_FOREACH(lcore_id) {
+               if (rte_lcore_is_enabled(lcore_id) == 0)
+                       continue;
+               /* Restore the original value in kernel. */
+               rte_power_qos_set_cpu_resume_latency(lcore_id,
+                               RTE_POWER_QOS_RESUME_LATENCY_NO_CONSTRAINT);
+       }
+
        return ret;
 }
 
-- 
2.22.0