diff mbox series

[v3,2/6] test/spinlock: remove 1us delay for correct benchmarking

Message ID 20181227041349.3058-3-gavin.hu@arm.com (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers show
Series spinlock optimization and test case enhancements | expand

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK

Commit Message

Gavin Hu Dec. 27, 2018, 4:13 a.m. UTC 
The test is to benchmark the performance of spinlock by counting the
number of spinlock acquire and release operations within the specified
time.
A typical pair of lock and unlock operations costs tens or hundreds of
nano seconds, in comparison to this, delaying 1 us outside of the locked
region is too much, compromising the goal of benchmarking the lock and
unlock performance.

Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Ruifeng Wang <Ruifeng.Wang@arm.com>
Reviewed-by: Joyce Kong <Joyce.Kong@arm.com>
Reviewed-by: Phil Yang <phil.yang@arm.com>
Reviewed-by: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
Reviewed-by: Ola Liljedahl <Ola.Liljedahl@arm.com>
---
 test/test/test_spinlock.c | 2 --
 1 file changed, 2 deletions(-)

Comments

Jerin Jacob Kollanukkaran Dec. 27, 2018, 7:20 a.m. UTC | #1 
On Thu, 2018-12-27 at 12:13 +0800, Gavin Hu wrote:
> -------------------------------------------------------------------
> ---
> The test is to benchmark the performance of spinlock by counting the
> number of spinlock acquire and release operations within the
> specified
> time.
> A typical pair of lock and unlock operations costs tens or hundreds
> of
> nano seconds, in comparison to this, delaying 1 us outside of the
> locked
> region is too much, compromising the goal of benchmarking the lock
> and
> unlock performance.
> 
> Signed-off-by: Gavin Hu <gavin.hu@arm.com>
> Reviewed-by: Ruifeng Wang <Ruifeng.Wang@arm.com>
> Reviewed-by: Joyce Kong <Joyce.Kong@arm.com>
> Reviewed-by: Phil Yang <phil.yang@arm.com>
> Reviewed-by: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
> Reviewed-by: Ola Liljedahl <Ola.Liljedahl@arm.com>
> ---

Acked-by: Jerin Jacob <jerinj@marvell.com>
diff mbox series

Patch

diff --git a/test/test/test_spinlock.c b/test/test/test_spinlock.c
index 73bff128e..6795195ae 100644
--- a/test/test/test_spinlock.c
+++ b/test/test/test_spinlock.c
@@ -120,8 +120,6 @@  load_loop_fn(void *func_param)
 		lcount++;
 		if (use_lock)
 			rte_spinlock_unlock(&lk);
-		/* delay to make lock duty cycle slighlty realistic */
-		rte_delay_us(1);
 		time_diff = rte_get_timer_cycles() - begin;
 	}
 	lock_count[lcore] = lcount;