[dpdk-dev] [PATCH] test/service: add perf test for service on app lcore

[Harry van Haaren <harry.van.haaren@intel.com>]

Add a performance test to the service run on app lcore auto-
test. This test runs the service in a tight loop, and measures
cycles passed, printing the results. It provides a quick cycle
cost value, enabling measuring performance of the function to
run a service on an application lcore.

Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>

---

I'm suggesting to merge this patch before the bugfix/C11 patch series,
(v2 currently here: http://patches.dpdk.org/patch/69199/ )
as this would enable users to benchmark the "before" and "after"
states of the bugfix/C11 patches easier.

---
 app/test/test_service_cores.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/app/test/test_service_cores.c b/app/test/test_service_cores.c
index a922c7ddc..469243314 100644
--- a/app/test/test_service_cores.c
+++ b/app/test/test_service_cores.c
@@ -789,8 +789,18 @@ service_app_lcore_poll_impl(const int mt_safe)
 				"MT Unsafe: App core1 didn't return -EBUSY");
 	}
 
-	unregister_all();
+	/* Performance test: call in a loop, and measure tsc() */
+	const uint32_t perf_iters = (1 << 12);
+	uint64_t start = rte_rdtsc();
+	for (uint32_t i = 0; i < perf_iters; i++) {
+		int err = service_run_on_app_core_func(&id);
+		TEST_ASSERT_EQUAL(0, err, "perf test: returned run failure");
+	}
+	uint64_t end = rte_rdtsc();
+	printf("perf test for %s: %0.1f cycles per call\n", mt_safe ?
+		"MT Safe" : "MT Unsafe", (end - start)/(float)perf_iters);
 
+	unregister_all();
 	return TEST_SUCCESS;
 }
 
-- 
2.17.1