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net/i40e: remove memory barrier from NEON Rx
[ upstream commit 78b5059 ] For x86, the descriptors needs to be loaded in order, so in between two descriptors loading, there is a compiler barrier in place.[1] For aarch64, a patch [2] is in place to survive with discontinuous DD bits, the barriers can be removed to take full advantage of out-of-order execution. 50% performance gain in the RFC2544 NDR test was measured on ThunderX2. 12.50% performance gain in the RFC2544 NDR test was measured on Ampere eMAG80 platform. [1] http://inbox.dpdk.org/users/039ED4275CED7440929022BC67E7061153D71548@ SHSMSX105.ccr.corp.intel.com/ [2] https://mails.dpdk.org/archives/stable/2017-October/003324.html Fixes: ae0eb31 ("net/i40e: implement vector PMD for ARM") 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>
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