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net/i40e: remove compiler barrier from NEON Rx

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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 measured 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@dpdk.org

Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Reviewed-by: Steve Capper <steve.capper@arm.com>
This commit is contained in:
Gavin Hu 2019-08-13 18:43:31 +08:00 committed by Ferruh Yigit
parent 78b50591c8
commit f1f0f39806
1 changed files with 0 additions and 3 deletions
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3
drivers/net/i40e/i40e_rxtx_vec_neon.c
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@ -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);