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From: Ruifeng Wang <ruifeng.wang@arm.com>
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 <ruifeng.wang@arm.com>
Subject: [dpdk-dev] [PATCH v2 1/3] examples/l3fwd: reorganize code for better performance
Date: Tue,  1 Jun 2021 07:56:51 +0000
Message-ID: <20210601075653.84927-2-ruifeng.wang@arm.com> (raw)
In-Reply-To: <20210601075653.84927-1-ruifeng.wang@arm.com>

Moved rfc1812 process prior to NEON registers store.
On N1SDP, this reorganization mitigates CPU frontend stall and backend
stall when forwarding.

On N1SDP with MLX5 40G NIC, this change showed 10.2% performance gain
in single port single core MRR test.
On ThunderX2, this changed showed no performance degradation.

Signed-off-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
 examples/l3fwd/l3fwd_neon.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/examples/l3fwd/l3fwd_neon.h b/examples/l3fwd/l3fwd_neon.h
index 86ac5971d7..ea7fe22d00 100644
--- a/examples/l3fwd/l3fwd_neon.h
+++ b/examples/l3fwd/l3fwd_neon.h
@@ -43,11 +43,6 @@ processx4_step3(struct rte_mbuf *pkt[FWDSTEP], uint16_t dst_port[FWDSTEP])
 	ve[2] = vsetq_lane_u32(vgetq_lane_u32(te[2], 3), ve[2], 3);
 	ve[3] = vsetq_lane_u32(vgetq_lane_u32(te[3], 3), ve[3], 3);
 
-	vst1q_u32(p[0], ve[0]);
-	vst1q_u32(p[1], ve[1]);
-	vst1q_u32(p[2], ve[2]);
-	vst1q_u32(p[3], ve[3]);
-
 	rfc1812_process((struct rte_ipv4_hdr *)
 			((struct rte_ether_hdr *)p[0] + 1),
 			&dst_port[0], pkt[0]->packet_type);
@@ -60,6 +55,11 @@ processx4_step3(struct rte_mbuf *pkt[FWDSTEP], uint16_t dst_port[FWDSTEP])
 	rfc1812_process((struct rte_ipv4_hdr *)
 			((struct rte_ether_hdr *)p[3] + 1),
 			&dst_port[3], pkt[3]->packet_type);
+
+	vst1q_u32(p[0], ve[0]);
+	vst1q_u32(p[1], ve[1]);
+	vst1q_u32(p[2], ve[2]);
+	vst1q_u32(p[3], ve[3]);
 }
 
 /*
-- 
2.25.1


  reply	other threads:[~2021-06-01  7:57 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
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   ` Ruifeng Wang [this message]
2021-06-06 18:34     ` [dpdk-dev] [PATCH v2 1/3] examples/l3fwd: reorganize code for better performance 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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