[dpdk-dev] [PATCH v2] examples/power: add baseline mode to PMD power

[David Hunt]

The PMD Power Management scheme currently has 3 modes,
scale, monitor and pause. However, it would be nice to
have a baseline mode for easy comparison of power savings
with and without these modes.

This patch adds a 'baseline' mode were the pmd power
management is not enabled. Use --pmg-mgmt=baseline.

Signed-off-by: David Hunt <david.h...@intel.com>

---
changes in v2
* added a bool for baseline mode rather than abusing enums
---
 examples/l3fwd-power/main.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
index f8dfed1634..aeb2411e62 100644
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -207,6 +207,7 @@ enum appmode {
 enum appmode app_mode;
 
 static enum rte_power_pmd_mgmt_type pmgmt_type;
+bool baseline_enabled;
 
 enum freq_scale_hint_t
 {
@@ -1617,7 +1618,7 @@ print_usage(const char *prgname)
                " empty polls, full polls, and core busyness to telemetry\n"
                " --interrupt-only: enable interrupt-only mode\n"
                " --pmd-mgmt MODE: enable PMD power management mode. "
-               "Currently supported modes: monitor, pause, scale\n",
+               "Currently supported modes: baseline, monitor, pause, scale\n",
                prgname);
 }
 
@@ -1714,6 +1715,7 @@ parse_pmd_mgmt_config(const char *name)
 #define PMD_MGMT_MONITOR "monitor"
 #define PMD_MGMT_PAUSE   "pause"
 #define PMD_MGMT_SCALE   "scale"
+#define PMD_MGMT_BASELINE  "baseline"
 
        if (strncmp(PMD_MGMT_MONITOR, name, sizeof(PMD_MGMT_MONITOR)) == 0) {
                pmgmt_type = RTE_POWER_MGMT_TYPE_MONITOR;
@@ -1729,6 +1731,10 @@ parse_pmd_mgmt_config(const char *name)
                pmgmt_type = RTE_POWER_MGMT_TYPE_SCALE;
                return 0;
        }
+       if (strncmp(PMD_MGMT_BASELINE, name, sizeof(PMD_MGMT_BASELINE)) == 0) {
+               baseline_enabled = true;
+               return 0;
+       }
        /* unknown PMD power management mode */
        return -1;
 }
@@ -2528,6 +2534,9 @@ main(int argc, char **argv)
        /* init RTE timer library to be used late */
        rte_timer_subsystem_init();
 
+       /* if we're running pmd-mgmt mode, don't default to baseline mode */
+       baseline_enabled = false;
+
        /* parse application arguments (after the EAL ones) */
        ret = parse_args(argc, argv);
        if (ret < 0)
@@ -2767,7 +2776,8 @@ main(int argc, char **argv)
                                                 "Fail to add ptype cb\n");
                        }
 
-                       if (app_mode == APP_MODE_PMD_MGMT) {
+                       if ((app_mode == APP_MODE_PMD_MGMT) &&
+                                       (baseline_enabled == false)) {
                                ret = rte_power_ethdev_pmgmt_queue_enable(
                                                lcore_id, portid, queueid,
                                                pmgmt_type);
-- 
2.17.1