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From: Jerin Jacob <jerinjacobk@gmail.com>
To: Gavin Hu <gavin.hu@arm.com>
Cc: dpdk-dev <dev@dpdk.org>, nd <nd@arm.com>,
	David Marchand <david.marchand@redhat.com>,
	 Thomas Monjalon <thomas@monjalon.net>,
	Jerin Jacob <jerinj@marvell.com>,
	 Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	 "Ruifeng Wang (Arm Technology China)" <Ruifeng.Wang@arm.com>,
	Phil Yang <Phil.Yang@arm.com>, Joyce Kong <Joyce.Kong@arm.com>
Subject: Re: [dpdk-dev] [PATCH v2 1/2] spinlock: use wfe to reduce contention on aarch64
Date: Tue, 28 Apr 2020 17:52:51 +0530	[thread overview]
Message-ID: <CALBAE1OsgaP3ROpps+KY2_qVwY-DrHUmih9cBmZwfBXqjU8+Hw@mail.gmail.com> (raw)
In-Reply-To: <20200426083909.897-2-gavin.hu@arm.com>

On Sun, Apr 26, 2020 at 2:09 PM Gavin Hu <gavin.hu@arm.com> wrote:
>
> In acquiring a spinlock, cores repeatedly poll the lock variable.
> This is replaced by rte_wait_until_equal API.
>
> Running the micro benchmarking and the testpmd and l3fwd traffic tests
> on ThunderX2, Ampere eMAG80 and Arm N1SDP, everything went well and no
> notable performance gain nor degradation was measured.
>
> Signed-off-by: Gavin Hu <gavin.hu@arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> Reviewed-by: Phil Yang <phil.yang@arm.com>
> Reviewed-by: Steve Capper <steve.capper@arm.com>
> Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com>
> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> Tested-by: Pavan Nikhilesh <pbhagavatula@marvell.com>

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


> ---
>  lib/librte_eal/include/generic/rte_spinlock.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lib/librte_eal/include/generic/rte_spinlock.h b/lib/librte_eal/include/generic/rte_spinlock.h
> index 87ae7a4f1..40fe49d5a 100644
> --- a/lib/librte_eal/include/generic/rte_spinlock.h
> +++ b/lib/librte_eal/include/generic/rte_spinlock.h
> @@ -65,8 +65,8 @@ rte_spinlock_lock(rte_spinlock_t *sl)
>
>         while (!__atomic_compare_exchange_n(&sl->locked, &exp, 1, 0,
>                                 __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)) {
> -               while (__atomic_load_n(&sl->locked, __ATOMIC_RELAXED))
> -                       rte_pause();
> +               rte_wait_until_equal_32((volatile uint32_t *)&sl->locked,
> +                              0, __ATOMIC_RELAXED);
>                 exp = 0;
>         }
>  }
> --
> 2.17.1
>

  reply	other threads:[~2020-04-28 12:23 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-24  7:07 [dpdk-dev] [PATCH v1 0/2] Use WFE for spinlock and ring Gavin Hu
2020-04-24  7:07 ` [dpdk-dev] [PATCH v1 1/2] spinlock: use wfe to reduce contention on aarch64 Gavin Hu
2020-04-24  7:07 ` [dpdk-dev] [PATCH v1 2/2] ring: use wfe to wait for ring tail update " Gavin Hu
2020-04-24 13:23   ` Ananyev, Konstantin
2020-04-26  8:41     ` Gavin Hu
2020-04-24 14:46   ` Honnappa Nagarahalli
2020-04-26  8:33     ` Gavin Hu
2020-04-26  8:39 ` [dpdk-dev] [PATCH v2 0/2] Use WFE for spinlock and ring Gavin Hu
2020-05-01  9:47   ` Ananyev, Konstantin
2020-05-03 14:54   ` David Marchand
2020-05-03 21:31     ` Honnappa Nagarahalli
2020-09-25 14:30       ` David Marchand
2021-03-25 14:58         ` David Marchand
2021-04-25  6:06           ` Ruifeng Wang
2021-04-25 15:56             ` Thomas Monjalon
2020-04-26  8:39 ` [dpdk-dev] [PATCH v2 1/2] spinlock: use wfe to reduce contention on aarch64 Gavin Hu
2020-04-28 12:22   ` Jerin Jacob [this message]
2020-04-26  8:39 ` [dpdk-dev] [PATCH v2 2/2] ring: use wfe to wait for ring tail update " Gavin Hu
2021-04-25  5:56 ` [dpdk-dev] Use WFE for spinlock and ring Ruifeng Wang
2021-04-25  5:56   ` [dpdk-dev] [PATCH v3 1/2] spinlock: use wfe to reduce contention on aarch64 Ruifeng Wang
2021-04-25  5:56   ` [dpdk-dev] [PATCH v3 2/2] ring: use wfe to wait for ring tail update " Ruifeng Wang
2021-04-26  5:38     ` Jerin Jacob
2021-04-28 17:17     ` Stephen Hemminger
2021-04-29 14:35       ` Ruifeng Wang
2021-04-29 15:05         ` Stephen Hemminger
2021-05-07  8:25           ` Ruifeng Wang
2021-04-28  7:42   ` [dpdk-dev] Use WFE for spinlock and ring David Marchand
2021-04-28  9:30     ` Ruifeng Wang
2021-04-28 11:13       ` Thomas Monjalon
2021-04-29 14:28         ` Ruifeng Wang
2021-04-29 15:20           ` Thomas Monjalon
2021-04-30  9:16             ` Bruce Richardson
2021-04-30 13:41               ` Honnappa Nagarahalli
2021-04-30 14:19                 ` Bruce Richardson
2021-05-07 10:18                   ` Ruifeng Wang
2021-05-07 10:24                     ` Bruce Richardson
2021-07-05  8:51                       ` David Marchand
2021-07-05 10:21                         ` Ruifeng Wang
2021-07-07 14:47   ` Stephen Hemminger
2021-07-08  9:41     ` Ruifeng Wang
2021-07-08 16:58       ` Honnappa Nagarahalli
2021-07-07  5:43 ` [dpdk-dev] [PATCH v4 0/3] " Ruifeng Wang
2021-07-07  5:43   ` [dpdk-dev] [PATCH v4 1/3] spinlock: use wfe to reduce contention on aarch64 Ruifeng Wang
2021-07-07  5:43   ` [dpdk-dev] [PATCH v4 2/3] ring: use wfe to wait for ring tail update " Ruifeng Wang
2021-07-07  5:43   ` [dpdk-dev] [PATCH v4 3/3] build: add option to enable wait until equal Ruifeng Wang
2021-07-07 12:15     ` David Marchand
2021-07-07  5:48 ` [dpdk-dev] [PATCH v4 0/3] Use WFE for spinlock and ring Ruifeng Wang
2021-07-07  5:48   ` [dpdk-dev] [PATCH v4 1/3] spinlock: use wfe to reduce contention on aarch64 Ruifeng Wang
2021-07-07  5:48   ` [dpdk-dev] [PATCH v4 2/3] ring: use wfe to wait for ring tail update " Ruifeng Wang
2021-07-07  5:48   ` [dpdk-dev] [PATCH v4 3/3] build: add option to enable wait until equal Ruifeng Wang
2021-07-07  6:32     ` Thomas Monjalon
2021-07-07  6:46       ` Ruifeng Wang
2021-07-07 12:27         ` Bruce Richardson
2021-07-07 12:36           ` Jerin Jacob
2021-07-08  6:25             ` Ruifeng Wang
2021-07-08  6:32               ` Jerin Jacob
2021-07-08  7:32                 ` Thomas Monjalon
2021-07-08  9:21                   ` Ruifeng Wang
2021-07-08 10:28                     ` Thomas Monjalon
2021-07-09 18:39   ` [dpdk-dev] [PATCH v4 0/3] Use WFE for spinlock and ring Thomas Monjalon

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