diff mbox series

[v1,2/5] app/eventdev: remove unnecessary barriers for perf test

Message ID 20210114070830.707550-3-feifei.wang2@arm.com (mailing list archive)
State Accepted, archived
Delegated to: Jerin Jacob
Headers
Series refactor smp barriers in app/eventdev |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Feifei Wang Jan. 14, 2021, 7:08 a.m. UTC 
  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(-)

Comments

Pavan Nikhilesh Bhagavatula Jan. 25, 2021, 5:48 p.m. UTC | #1 
>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>

Acked-by: Pavan Nikhilesh <pbhagavatula@marvell.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;
>--
>2.25.1
diff mbox series

Patch

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;