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From: Jerin Jacob <jerinjacobk@gmail.com>
To: Ruifeng Wang <ruifeng.wang@arm.com>
Cc: Jerin Jacob <jerinj@marvell.com>,
	Hemant Agrawal <hemant.agrawal@nxp.com>,
	 Ferruh Yigit <ferruh.yigit@intel.com>,
	Thomas Monjalon <thomas@monjalon.net>,
	 David Marchand <david.marchand@redhat.com>,
	dpdk-dev <dev@dpdk.org>, nd <nd@arm.com>,
	Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Subject: Re: [dpdk-dev] [PATCH 2/4] examples/l3fwd: eliminate unnecessary calculations
Date: Wed, 14 Apr 2021 00:10:43 +0530
Message-ID: <CALBAE1NXX0VQRX0ybAS7a5k8YFw4R5-uybUhZQG+UsArOpU2ig@mail.gmail.com> (raw)
In-Reply-To: <20210318102550.59265-3-ruifeng.wang@arm.com>

On Thu, Mar 18, 2021 at 3:56 PM Ruifeng Wang <ruifeng.wang@arm.com> wrote:
>
> Both L2 and L3 headers will be used in forward processing. And these
> two headers are in the same cache line. It has the same effect for
> prefetching with L2 header address and prefetching with L3 header
> address.
>
> Changed to use L2 header address for prefetching. The change showed
> no measurable performance improvement, but it definitely removed

Same here.

> unnecessary instructions for address calculation.


>
> Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>

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


> ---
>  examples/l3fwd/l3fwd_lpm_neon.h | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/examples/l3fwd/l3fwd_lpm_neon.h b/examples/l3fwd/l3fwd_lpm_neon.h
> index ae8840694..1650ae444 100644
> --- a/examples/l3fwd/l3fwd_lpm_neon.h
> +++ b/examples/l3fwd/l3fwd_lpm_neon.h
> @@ -98,14 +98,14 @@ l3fwd_lpm_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,
>         if (k) {
>                 for (i = 0; i < FWDSTEP; i++) {
>                         rte_prefetch0_write(rte_pktmbuf_mtod(pkts_burst[i],
> -                                               struct rte_ether_hdr *) + 1);
> +                                                       void *));
>                 }
>
>                 for (j = 0; j != k - FWDSTEP; j += FWDSTEP) {
>                         for (i = 0; i < FWDSTEP; i++) {
>                                 rte_prefetch0_write(rte_pktmbuf_mtod(
>                                                 pkts_burst[j + i + FWDSTEP],
> -                                               struct rte_ether_hdr *) + 1);
> +                                               void *));
>                         }
>
>                         processx4_step1(&pkts_burst[j], &dip, &ipv4_flag);
> @@ -125,17 +125,17 @@ l3fwd_lpm_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,
>                 switch (m) {
>                 case 3:
>                         rte_prefetch0_write(rte_pktmbuf_mtod(pkts_burst[j],
> -                                               struct rte_ether_hdr *) + 1);
> +                                                       void *));
>                         j++;
>                         /* fallthrough */
>                 case 2:
>                         rte_prefetch0_write(rte_pktmbuf_mtod(pkts_burst[j],
> -                                               struct rte_ether_hdr *) + 1);
> +                                                       void *));
>                         j++;
>                         /* fallthrough */
>                 case 1:
>                         rte_prefetch0_write(rte_pktmbuf_mtod(pkts_burst[j],
> -                                               struct rte_ether_hdr *) + 1);
> +                                                       void *));
>                         j++;
>                 }
>
> --
> 2.25.1
>

  reply	other threads:[~2021-04-13 18:41 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-18 10:25 [dpdk-dev] [PATCH 0/4] l3fwd improvements Ruifeng Wang
2021-03-18 10:25 ` [dpdk-dev] [PATCH 1/4] examples/l3fwd: tune prefetch for better performance Ruifeng Wang
2021-04-13 18:50   ` Jerin Jacob
2021-04-13 20:00     ` Honnappa Nagarahalli
2021-05-19  7:52     ` Ruifeng Wang
2021-03-18 10:25 ` [dpdk-dev] [PATCH 2/4] examples/l3fwd: eliminate unnecessary calculations Ruifeng Wang
2021-04-13 18:40   ` Jerin Jacob [this message]
2021-03-18 10:25 ` [dpdk-dev] [PATCH 3/4] examples/l3fwd: eliminate unnecessary reloads in loop Ruifeng Wang
2021-04-13 17:43   ` Jerin Jacob
2021-04-14  6:02     ` Ruifeng Wang
2021-03-18 10:25 ` [dpdk-dev] [PATCH 4/4] examples/l3fwd: make data struct to be memory efficient Ruifeng Wang
2021-04-13 19:06   ` Jerin Jacob
2021-04-21  5:22     ` Hemant Agrawal
2021-04-26 10:55       ` Walsh, Conor
2021-04-27  1:19         ` Ruifeng Wang
2021-04-13  8:24 ` [dpdk-dev] [PATCH 0/4] l3fwd improvements Ruifeng Wang
2021-04-13 17:33   ` Jerin Jacob
2021-04-16  9:39 ` Ling, WeiX
2021-06-01  7:56 ` [dpdk-dev] [PATCH v2 0/3] " Ruifeng Wang
2021-06-01  7:56   ` [dpdk-dev] [PATCH v2 1/3] examples/l3fwd: reorganize code for better performance Ruifeng Wang
2021-06-06 18:34     ` Jerin Jacob
2021-06-01  7:56   ` [dpdk-dev] [PATCH v2 2/3] examples/l3fwd: eliminate unnecessary calculations Ruifeng Wang
2021-06-01  7:56   ` [dpdk-dev] [PATCH v2 3/3] examples/l3fwd: eliminate unnecessary reloads in loop Ruifeng Wang
2021-06-06 18:39     ` Jerin Jacob
2021-06-10  6:57 ` [dpdk-dev] [PATCH v3 0/2] l3fwd improvements Ruifeng Wang
2021-06-10  6:57   ` [dpdk-dev] [PATCH v3 1/2] examples/l3fwd: eliminate unnecessary calculations Ruifeng Wang
2021-06-10  6:57   ` [dpdk-dev] [PATCH v3 2/2] examples/l3fwd: eliminate unnecessary reloads in loop Ruifeng Wang
2021-07-05  8:36   ` [dpdk-dev] [PATCH v3 0/2] l3fwd improvements David Marchand

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