examples/l3fwd-power: fix frequency detection

The code assumes that the platform frequency is 2GHz.
This patch add support for dynamically detecting platform frequence.

Fixes: d7937e2e3d12 ("power: initial import")
Cc: stable@dpdk.org
Signed-off-by: Nikhil Agarwal <nikhil.agarwal@linaro.org>
Acked-by: David Hunt <david.hunt@intel.com>

diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
index 0896427..d4a59aa 100644 (file)
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -50,8 +50,6 @@
 
 #define MIN_ZERO_POLL_COUNT 10
 
-/* around 100ms at 2 Ghz */
-#define TIMER_RESOLUTION_CYCLES           200000000ULL
 /* 100 ms interval */
 #define TIMER_NUMBER_PER_SECOND           10
 /* 100000 us */
@@ -846,7 +844,7 @@ main_loop(__attribute__((unused)) void *dummy)
 {
        struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
        unsigned lcore_id;
-       uint64_t prev_tsc, diff_tsc, cur_tsc;
+       uint64_t prev_tsc, diff_tsc, cur_tsc, tim_res_tsc, hz;
        uint64_t prev_tsc_power = 0, cur_tsc_power, diff_tsc_power;
        int i, j, nb_rx;
        uint8_t queueid;
@@ -861,6 +859,8 @@ main_loop(__attribute__((unused)) void *dummy)
        const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) / US_PER_S * BURST_TX_DRAIN_US;
 
        prev_tsc = 0;
+       hz = rte_get_timer_hz();
+       tim_res_tsc = hz/TIMER_NUMBER_PER_SECOND;
 
        lcore_id = rte_lcore_id();
        qconf = &lcore_conf[lcore_id];
@@ -906,7 +906,7 @@ main_loop(__attribute__((unused)) void *dummy)
                }
 
                diff_tsc_power = cur_tsc_power - prev_tsc_power;
-               if (diff_tsc_power > TIMER_RESOLUTION_CYCLES) {
+               if (diff_tsc_power > tim_res_tsc) {
                        rte_timer_manage();
                        prev_tsc_power = cur_tsc_power;
                }