* [dpdk-users] Query on IXGBE vPMD barrier after descriptors load
@ 2019-08-08 10:21 Ruifeng Wang (Arm Technology China)
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From: Ruifeng Wang (Arm Technology China) @ 2019-08-08 10:21 UTC (permalink / raw)
To: Bruce Richardson
Cc: users, Zhang, Qi Z, Gavin Hu (Arm Technology China),
nd, Honnappa Nagarahalli
Hi Bruce,
When reading IXGBE vPMD code, I have doubt on the barrier used. Hope you can provide more info on this.
In function _recv_raw_pkts_vec, there is a compiler_barrier after load of descs[0]:
https://code.dpdk.org/dpdk/latest/source/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c#L469<https://code.dpdk.org/dpdk/latest/source/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c>
Could you give some hint about what sequence it is ensuring?
Similar barrier for NEON vPMD on aarch64 platform impacts performance much.
Regards,
/Ruifeng
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