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From: Gavin Hu <gavin.hu@arm.com>
To: dev@dpdk.org
Cc: nd@arm.com, thomas@monjalon.net, jerinj@marvell.com,
	hemant.agrawal@nxp.com, nipun.gupta@nxp.com,
	Honnappa.Nagarahalli@arm.com, gavin.hu@arm.com,
	i.maximets@samsung.com, chaozhu@linux.vnet.ibm.com,
	stable@dpdk.org
Subject: [dpdk-dev] [PATCH v8 1/3] test/spinlock: remove 1us delay for correct benchmarking
Date: Fri,  8 Mar 2019 15:56:35 +0800	[thread overview]
Message-ID: <1552031797-146710-2-git-send-email-gavin.hu@arm.com> (raw)
In-Reply-To: <1552031797-146710-1-git-send-email-gavin.hu@arm.com>
In-Reply-To: <20181220104246.5590-1-gavin.hu@arm.com>

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.

Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org

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>
---
 app/test/test_spinlock.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/app/test/test_spinlock.c b/app/test/test_spinlock.c
index 73bff12..6795195 100644
--- a/app/test/test_spinlock.c
+++ b/app/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;
-- 
2.7.4

  parent reply	other threads:[~2019-03-08  7:57 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-20 10:42 [dpdk-dev] [PATCH v1 0/5] spinlock optimization and test case enhancements Gavin Hu
2018-12-20 10:42 ` [dpdk-dev] [PATCH v1 1/5] test/spinlock: remove 1us delay for correct spinlock benchmarking Gavin Hu
2018-12-20 10:42 ` [dpdk-dev] [PATCH v1 2/5] test/spinlock: get timestamp more precisely Gavin Hu
2018-12-20 10:42 ` [dpdk-dev] [PATCH v1 3/5] test/spinlock: amortize the cost of getting time Gavin Hu
2018-12-20 10:42 ` [dpdk-dev] [PATCH v1 4/5] spinlock: move the implementation to arm specific file Gavin Hu
2018-12-20 12:47   ` David Marchand
2018-12-20 12:55     ` David Marchand
2018-12-20 14:40       ` Gavin Hu (Arm Technology China)
2018-12-20 14:36     ` Gavin Hu (Arm Technology China)
2018-12-20 15:09       ` David Marchand
2018-12-20 15:58         ` Gavin Hu (Arm Technology China)
2018-12-20 15:59           ` David Marchand
2018-12-20 10:42 ` [dpdk-dev] [PATCH v1 5/5] spinlock: reimplement with atomic one-way barrier builtins Gavin Hu
2018-12-20 17:42 ` [dpdk-dev] [PATCH v2 0/5] spinlock optimization and test case enhancements Gavin Hu
2018-12-20 17:42   ` [dpdk-dev] [PATCH v2 1/5] test/spinlock: remove 1us delay for correct benchmarking Gavin Hu
2018-12-20 17:42   ` [dpdk-dev] [PATCH v2 2/5] test/spinlock: get timestamp more precisely Gavin Hu
2018-12-20 17:42   ` [dpdk-dev] [PATCH v2 3/5] test/spinlock: amortize the cost of getting time Gavin Hu
2018-12-20 17:42   ` [dpdk-dev] [PATCH v2 4/5] spinlock: reimplement with atomic one-way barrier builtins Gavin Hu
2018-12-20 17:42   ` [dpdk-dev] [PATCH v2 5/5] eal: fix clang compilation error on x86 Gavin Hu
2019-01-15  7:54 ` [dpdk-dev] [PATCH v4 0/4] spinlock optimization and test case enhancements gavin hu
2019-01-15  7:54 ` [dpdk-dev] [PATCH v4 1/4] eal: fix clang compilation error on x86 gavin hu
2019-01-15  7:54 ` [dpdk-dev] [PATCH v4 2/4] test/spinlock: remove 1us delay for correct benchmarking gavin hu
2019-01-15  7:54 ` [dpdk-dev] [PATCH v4 3/4] test/spinlock: amortize the cost of getting time gavin hu
2019-01-15  7:54 ` [dpdk-dev] [PATCH v4 4/4] spinlock: reimplement with atomic one-way barrier builtins gavin hu
2019-01-15 10:32 ` [dpdk-dev] [PATCH v5 0/4] spinlock optimization and test case enhancements gavin hu
2019-01-15 10:32 ` [dpdk-dev] [PATCH v5 1/4] eal: fix clang compilation error on x86 gavin hu
2019-01-15 17:42   ` Honnappa Nagarahalli
2019-01-15 10:32 ` [dpdk-dev] [PATCH v5 2/4] test/spinlock: remove 1us delay for correct benchmarking gavin hu
2019-01-15 10:32 ` [dpdk-dev] [PATCH v5 3/4] test/spinlock: amortize the cost of getting time gavin hu
2019-01-15 10:32 ` [dpdk-dev] [PATCH v5 4/4] spinlock: reimplement with atomic one-way barrier builtins gavin hu
2019-03-08  7:16 ` [dpdk-dev] [PATCH v6 0/3] generic spinlock optimization and test case enhancements Gavin Hu
2019-03-08  7:16 ` [dpdk-dev] [PATCH v6 1/3] test/spinlock: dealy 1 us to create contention Gavin Hu
2019-03-08  7:16 ` [dpdk-dev] [PATCH v6 2/3] test/spinlock: amortize the cost of getting time Gavin Hu
2019-03-08  7:16 ` [dpdk-dev] [PATCH v6 3/3] spinlock: reimplement with atomic one-way barrier builtins Gavin Hu
2019-03-08  7:37 ` [dpdk-dev] [PATCH v7 0/3] generic spinlock optimization and test case enhancements Gavin Hu
2019-03-08  7:37 ` [dpdk-dev] [PATCH v7 1/3] test/spinlock: remove 1us delay for correct benchmarking Gavin Hu
2019-03-08  7:37 ` [dpdk-dev] [PATCH v7 2/3] test/spinlock: amortize the cost of getting time Gavin Hu
2019-03-08  7:37 ` [dpdk-dev] [PATCH v7 3/3] spinlock: reimplement with atomic one-way barrier builtins Gavin Hu
2019-03-08  7:56 ` [dpdk-dev] [PATCH v8 0/3] generic spinlock optimization and test case enhancements Gavin Hu
2019-03-11 12:21   ` Nipun Gupta
2019-03-15 12:21   ` Ananyev, Konstantin
2019-03-15 12:21     ` Ananyev, Konstantin
2019-03-28  7:47   ` Thomas Monjalon
2019-03-28  7:47     ` Thomas Monjalon
2019-03-08  7:56 ` Gavin Hu [this message]
2019-03-08  7:56 ` [dpdk-dev] [PATCH v8 2/3] test/spinlock: amortize the cost of getting time Gavin Hu
2019-03-08  7:56 ` [dpdk-dev] [PATCH v8 3/3] spinlock: reimplement with atomic one-way barrier builtins Gavin Hu
2019-03-12 14:53   ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2019-03-14  0:31     ` Honnappa Nagarahalli
2019-03-14  0:31       ` Honnappa Nagarahalli
2019-03-14  2:36       ` Gavin Hu (Arm Technology China)
2019-03-14  2:36         ` Gavin Hu (Arm Technology China)
2019-03-14 14:22   ` Jerin Jacob Kollanukkaran
2019-03-14 14:22     ` Jerin Jacob Kollanukkaran

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