[dpdk-dev] [PATCH 2/2] net/i40e: remove compiler barrier for aarch64
Gavin Hu
gavin.hu at arm.com
Tue Aug 13 12:43:31 CEST 2019
As packet length extraction code was simplified,the ordering
was not necessary any more.[1]
2% performance gain was measured on Marvell ThunderX2.
4.3% performance gain was measure on Ampere eMAG80
[1] http://mails.dpdk.org/archives/dev/2016-April/037529.html
Fixes: ae0eb310f253 ("net/i40e: implement vector PMD for ARM")
Cc: stable at dpdk.org
Signed-off-by: Gavin Hu <gavin.hu at arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
Reviewed-by: Steve Capper <steve.capper at arm.com>
---
drivers/net/i40e/i40e_rxtx_vec_neon.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/net/i40e/i40e_rxtx_vec_neon.c b/drivers/net/i40e/i40e_rxtx_vec_neon.c
index 5555e9b..864eb9a 100644
--- a/drivers/net/i40e/i40e_rxtx_vec_neon.c
+++ b/drivers/net/i40e/i40e_rxtx_vec_neon.c
@@ -307,9 +307,6 @@ _recv_raw_pkts_vec(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts,
rte_mbuf_prefetch_part2(rx_pkts[pos + 3]);
}
- /* avoid compiler reorder optimization */
- rte_compiler_barrier();
-
/* pkt 3,4 shift the pktlen field to be 16-bit aligned*/
uint32x4_t len3 = vshlq_u32(vreinterpretq_u32_u64(descs[3]),
len_shl);
--
2.7.4
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