From 542cf18b99be0a2d4ab2b075c4b7417f3f4b4975 Mon Sep 17 00:00:00 2001 From: Honnappa Nagarahalli Date: Sat, 18 Jan 2020 13:32:42 -0600 Subject: [PATCH] test/ring: use division for cycle count calculation Use division instead of modulo operation to calculate more accurate cycle count. Signed-off-by: Honnappa Nagarahalli Acked-by: Olivier Matz --- app/test/test_ring_perf.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/app/test/test_ring_perf.c b/app/test/test_ring_perf.c index 70ee46ffe6..6c2aca4839 100644 --- a/app/test/test_ring_perf.c +++ b/app/test/test_ring_perf.c @@ -357,10 +357,10 @@ test_single_enqueue_dequeue(struct rte_ring *r) } const uint64_t mc_end = rte_rdtsc(); - printf("SP/SC single enq/dequeue: %"PRIu64"\n", - (sc_end-sc_start) >> iter_shift); - printf("MP/MC single enq/dequeue: %"PRIu64"\n", - (mc_end-mc_start) >> iter_shift); + printf("SP/SC single enq/dequeue: %.2F\n", + ((double)(sc_end-sc_start)) / iterations); + printf("MP/MC single enq/dequeue: %.2F\n", + ((double)(mc_end-mc_start)) / iterations); } /* @@ -395,13 +395,15 @@ test_burst_enqueue_dequeue(struct rte_ring *r) } const uint64_t mc_end = rte_rdtsc(); - uint64_t mc_avg = ((mc_end-mc_start) >> iter_shift) / bulk_sizes[sz]; - uint64_t sc_avg = ((sc_end-sc_start) >> iter_shift) / bulk_sizes[sz]; + double mc_avg = ((double)(mc_end-mc_start) / iterations) / + bulk_sizes[sz]; + double sc_avg = ((double)(sc_end-sc_start) / iterations) / + bulk_sizes[sz]; - printf("SP/SC burst enq/dequeue (size: %u): %"PRIu64"\n", bulk_sizes[sz], - sc_avg); - printf("MP/MC burst enq/dequeue (size: %u): %"PRIu64"\n", bulk_sizes[sz], - mc_avg); + printf("SP/SC burst enq/dequeue (size: %u): %.2F\n", + bulk_sizes[sz], sc_avg); + printf("MP/MC burst enq/dequeue (size: %u): %.2F\n", + bulk_sizes[sz], mc_avg); } } -- 2.20.1