From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id BF727A0561; Thu, 18 Mar 2021 11:26:30 +0100 (CET) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id A7B7F140EAD; Thu, 18 Mar 2021 11:26:30 +0100 (CET) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mails.dpdk.org (Postfix) with ESMTP id D0B76140E6D for ; Thu, 18 Mar 2021 11:26:29 +0100 (CET) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 540F231B; Thu, 18 Mar 2021 03:26:29 -0700 (PDT) Received: from net-arm-n1amp-01.shanghai.arm.com (net-arm-n1amp-01.shanghai.arm.com [10.169.210.137]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 795F13F792; Thu, 18 Mar 2021 03:26:26 -0700 (PDT) From: Ruifeng Wang To: jerinj@marvell.com, hemant.agrawal@nxp.com, ferruh.yigit@intel.com, thomas@monjalon.net, david.marchand@redhat.com Cc: dev@dpdk.org, nd@arm.com, honnappa.nagarahalli@arm.com, Ruifeng Wang Date: Thu, 18 Mar 2021 10:25:48 +0000 Message-Id: <20210318102550.59265-3-ruifeng.wang@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210318102550.59265-1-ruifeng.wang@arm.com> References: <20210318102550.59265-1-ruifeng.wang@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [dpdk-dev] [PATCH 2/4] examples/l3fwd: eliminate unnecessary calculations X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" 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 unnecessary instructions for address calculation. Signed-off-by: Ruifeng Wang --- 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