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i40e: prefetch next mbuf in Rx init loop

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This patch improves performance of Rx with i40e devices.

Signed-off-by: Damjan Marion <damarion@cisco.com>
Acked-by: Helin Zhang <helin.zhang@intel.com>
[Thomas: apply Helin's comments]
This commit is contained in:
Damjan Marion 2015-06-11 00:19:25 +02:00 committed by Thomas Monjalon
parent 7eda588164
commit b91fe0f7ad
1 changed files with 4 additions and 0 deletions
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4
drivers/net/i40e/i40e_rxtx.c
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@ -813,6 +813,10 @@ i40e_rx_alloc_bufs(struct i40e_rx_queue *rxq)
rxdp = &rxq->rx_ring[alloc_idx];
for (i = 0; i < rxq->rx_free_thresh; i++) {
if (likely(i < (rxq->rx_free_thresh - 1)))
/* Prefetch next mbuf */
rte_prefetch0(rxep[i + 1].mbuf);
mb = rxep[i].mbuf;
rte_mbuf_refcnt_set(mb, 1);
mb->next = NULL;