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From: Feifei Wang <feifei.wang2@arm.com>
To: Jerin Jacob <jerinj@marvell.com>
Cc: dev@dpdk.org, nd@arm.com, Honnappa.Nagarahalli@arm.com,
	Feifei Wang <feifei.wang2@arm.com>
Subject: [dpdk-dev] [RFC PATCH v1 2/6] app/eventdev: remove unnecessary barriers for perf test
Date: Tue, 22 Dec 2020 13:07:23 +0800
Message-ID: <20201222050728.41000-3-feifei.wang2@arm.com> (raw)
In-Reply-To: <20201222050728.41000-1-feifei.wang2@arm.com>

For "processed_pkts" and "total_latency" functions, no operations should
keep the order that being executed before loading
"worker[i].processed_pkts". Thus rmb is unnecessary before loading.

For "perf_launch_lcores" function, wmb after that the main lcore
updates the variable "t->done", which represents the end of the test
signal, is unnecessary. Because after the main lcore updates this
siginal variable, it will jump out of the launch function loop, and wait
other lcores stop or return error in the main function(evt_main.c).
During this time, there is no important storing operation and thus no
need for wmb.

Signed-off-by: Feifei Wang <feifei.wang2@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
 app/test-eventdev/test_perf_common.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/app/test-eventdev/test_perf_common.c b/app/test-eventdev/test_perf_common.c
index 955edb752..34cded373 100644
--- a/app/test-eventdev/test_perf_common.c
+++ b/app/test-eventdev/test_perf_common.c
@@ -224,7 +224,6 @@ processed_pkts(struct test_perf *t)
 	uint8_t i;
 	uint64_t total = 0;
 
-	rte_smp_rmb();
 	for (i = 0; i < t->nb_workers; i++)
 		total += t->worker[i].processed_pkts;
 
@@ -237,7 +236,6 @@ total_latency(struct test_perf *t)
 	uint8_t i;
 	uint64_t total = 0;
 
-	rte_smp_rmb();
 	for (i = 0; i < t->nb_workers; i++)
 		total += t->worker[i].latency;
 
@@ -327,7 +325,6 @@ perf_launch_lcores(struct evt_test *test, struct evt_options *opt,
 					opt->prod_type ==
 					EVT_PROD_TYPE_EVENT_TIMER_ADPTR) {
 					t->done = true;
-					rte_smp_wmb();
 					break;
 				}
 			}
@@ -341,7 +338,6 @@ perf_launch_lcores(struct evt_test *test, struct evt_options *opt,
 				rte_event_dev_dump(opt->dev_id, stdout);
 				evt_err("No schedules for seconds, deadlock");
 				t->done = true;
-				rte_smp_wmb();
 				break;
 			}
 			dead_lock_remaining = remaining;
-- 
2.17.1


  parent reply	other threads:[~2020-12-22  5:08 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-22  5:07 [dpdk-dev] [RFC PATCH v1 0/6] refactor smp barriers in app/eventdev Feifei Wang
2020-12-22  5:07 ` [dpdk-dev] [RFC PATCH v1 1/6] app/eventdev: fix SMP barrier bugs for perf test Feifei Wang
2020-12-22  5:07 ` Feifei Wang [this message]
2020-12-22  5:07 ` [dpdk-dev] [RFC PATCH v1 3/6] app/eventdev: replace wmb with thread fence " Feifei Wang
2020-12-22  5:07 ` [dpdk-dev] [RFC PATCH v1 4/6] app/eventdev: add release barriers for pipeline test Feifei Wang
2020-12-22  5:07 ` [dpdk-dev] [RFC PATCH v1 5/6] app/eventdev: remove unnecessary " Feifei Wang
2020-12-22  5:07 ` [dpdk-dev] [RFC PATCH v1 6/6] app/eventdev: remove unnecessary barriers for order test Feifei Wang
  -- strict thread matches above, loose matches on Subject: below --
2020-12-22  3:22 [dpdk-dev] [RFC PATCH v1 0/6] refactor smp barriers in app/eventdev Feifei Wang
2020-12-22  3:22 ` [dpdk-dev] [RFC PATCH v1 2/6] app/eventdev: remove unnecessary barriers for perf test Feifei Wang

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