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From: Gavin Hu <gavin.hu@arm.com>
To: dev@dpdk.org
Cc: nd@arm.com, david.marchand@redhat.com, thomas@monjalon.net,
	jerinj@marvell.com, xiaolong.ye@intel.com,
	Honnappa.Nagarahalli@arm.com, ruifeng.wang@arm.com,
	phil.yang@arm.com, joyce.kong@arm.com, steve.capper@arm.com
Subject: [dpdk-dev] [PATCH v1 3/3] net/i40e: auto-vectorization to speed up Tx free
Date: Fri,  6 Mar 2020 13:04:27 +0800
Message-ID: <20200306050427.66114-4-gavin.hu@arm.com> (raw)
In-Reply-To: <20200306050427.66114-1-gavin.hu@arm.com>

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


  parent reply	other threads:[~2020-03-06  5:05 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 ` Gavin Hu [this message]
2020-03-06  7:44   ` [dpdk-dev] [PATCH v1 3/3] net/i40e: auto-vectorization to speed up Tx free Jerin Jacob
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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