[dpdk-stable] patch 'examples/l3fwd-power: fix frequency detection' has been queued to LTS release 16.11.5

[luca.boccassi@gmail.com]

Hi,

FYI, your patch has been queued to LTS release 16.11.5

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 01/28/18. So please
shout if anyone has objections.

Thanks.

Luca Boccassi

---
>From 9147ae09d0872dc5e61fd1e58eec5ca0bff568ce Mon Sep 17 00:00:00 2001
From: Nikhil Agarwal <nikhil.agarwal@linaro.org>
Date: Tue, 12 Dec 2017 15:38:24 +0530
Subject: [PATCH] examples/l3fwd-power: fix frequency detection

[ upstream commit 63de7e6e4fb507755c8306cb50ef27b85c8f6f2d ]

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

Fixes: d7937e2e3d12 ("power: initial import")

Signed-off-by: Nikhil Agarwal <nikhil.agarwal@linaro.org>
Acked-by: David Hunt <david.hunt@intel.com>
---
 examples/l3fwd-power/main.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
index 7e0c7d8a4..217a448b0 100644
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -83,8 +83,6 @@
 
 #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 */
@@ -824,7 +822,7 @@ 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 portid, queueid;
@@ -838,6 +836,8 @@ 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];
@@ -883,7 +883,7 @@ 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;
 		}
-- 
2.14.2