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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>,
	 "Ye, Xiaolong" <xiaolong.ye@intel.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>,
	Steve Capper <steve.capper@arm.com>
Subject: Re: [dpdk-dev] [PATCH v1 3/3] net/i40e: auto-vectorization to speed up Tx free
Date: Fri, 6 Mar 2020 13:14:48 +0530
Message-ID: <CALBAE1Om8CE=SZVF4J88d=VFAAK9j2xMSOB81j5nzFAchA-uEQ@mail.gmail.com> (raw)
In-Reply-To: <20200306050427.66114-4-gavin.hu@arm.com>

On Fri, Mar 6, 2020 at 10:35 AM Gavin Hu <gavin.hu@arm.com> wrote:
>
> Tx mbuf free is a hotspot for i40e on aarch64, as there are no
> inter-loop dependencies, it is safe to enable auto-vectorization
> to speed up.
>
> This patch showed 2~3% performance lift on ThunderX2 and no degradation
> on Arm N1SDP. The test case is single core RFC2544 zero-loss test.
>
> Signed-off-by: Gavin Hu <gavin.hu@arm.com>
> Reviewed-by: Steve Capper <steve.capper@arm.com>
> ---
>  drivers/net/i40e/i40e_rxtx_vec_common.h | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/net/i40e/i40e_rxtx_vec_common.h b/drivers/net/i40e/i40e_rxtx_vec_common.h
> index 0e6ffa007..fc0fa45d4 100644
> --- a/drivers/net/i40e/i40e_rxtx_vec_common.h
> +++ b/drivers/net/i40e/i40e_rxtx_vec_common.h
> @@ -98,6 +98,11 @@ i40e_tx_free_bufs(struct i40e_tx_queue *txq)
>         if (likely(m != NULL)) {
>                 free[0] = m;
>                 nb_free = 1;
> +#if defined(__clang__)
> +#pragma clang loop vectorize(assume_safety)
> +#elif defined(__GNUC__)
> +#pragma GCC ivdep
> +#endif

IMO, It is better to abstract the compiler features  (above compiler
feature and __restrict__) as macros in
rte_common.h or so. It will help to support other compilers(ICC or
Windows) and enable them to have "changes" in one place.



>                 for (i = 1; i < n; i++) {
>                         m = rte_pktmbuf_prefree_seg(txep[i].mbuf);
>                         if (likely(m != NULL)) {
> --
> 2.17.1
>

  reply	other threads:[~2020-03-06  7:45 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-06  5:04 [dpdk-dev] [PATCH v1 0/3] i40e vPMD optimization on aarch64 Gavin Hu
2020-03-06  5:04 ` [dpdk-dev] [PATCH v1 1/3] net/i40e: relax barrier in the Tx fastpath of vPMD Gavin Hu
2020-03-06  9:11   ` Jerin Jacob
2020-03-06  5:04 ` [dpdk-dev] [PATCH v1 2/3] net/i40e: restrict pointer aliasing for neon vec Gavin Hu
2020-03-06  5:04 ` [dpdk-dev] [PATCH v1 3/3] net/i40e: auto-vectorization to speed up Tx free Gavin Hu
2020-03-06  7:44   ` Jerin Jacob [this message]
2020-03-06  9:06     ` Thomas Monjalon
2020-03-07 15:03     ` Gavin Hu
2020-03-09  7:35       ` Jerin Jacob
2020-03-09  9:23         ` Gavin Hu
2020-04-13 15:56 ` [dpdk-dev] [PATCH v2 0/2] i40e NEON vPMD optimization on aarch64 Gavin Hu
2020-04-13 15:56 ` [dpdk-dev] [PATCH v2 1/2] net/i40e: relax barrier in Tx fastpath for NEON vPMD Gavin Hu
2020-04-13 15:56 ` [dpdk-dev] [PATCH v2 2/2] net/i40e: restrict pointer aliasing " Gavin Hu
2020-04-20 14:51   ` Ferruh Yigit
2020-04-21  9:51     ` Gavin Hu
2020-04-13 16:40 ` [dpdk-dev] [PATCH v3 0/2] i40e NEON vPMD optimization on aarch64 Gavin Hu
2020-04-15  6:50   ` Ye Xiaolong
2020-04-13 16:40 ` [dpdk-dev] [PATCH v3 1/2] net/i40e: relax barrier in Tx fastpath for NEON vPMD Gavin Hu
2020-04-13 16:40 ` [dpdk-dev] [PATCH v3 2/2] net/i40e: restrict pointer aliasing " Gavin Hu

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