[PATCH v6] eal/x86: optimize memcpy of small sizes

[Varghese, Vipin]

[Public]

Hi @Morten Brørup, please find our observation running testpmd with memif in zero-copy mode disabled (rte_memcpy enabled).

1. DPDK baseline version: 25.11 we tested with testpmd in io & flowgen mode
2. using no cargs for memcpy (rtemov32) and with patch 64B & 65B we get `15.5Mpps`
3. using cargs ` -DRTE_MEMCPY_AVX512` for memcpy (rtemov64) and with patch 64B & 65B we get `14.8Mpps`

We will run with dma-perf application for payload sizes of 1,2,3,4,5,...etc

Regards
Vipin Varghese