From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Helin Zhang <helin.zhang@intel.com>
Cc: dev@dpdk.org, Damjan Marion <damarion@cisco.com>
Subject: Re: [dpdk-dev] [PATCH] i40e: prefetch next mbuf in rx alloc code
Date: Fri, 10 Jul 2015 16:33:19 +0200 [thread overview]
Message-ID: <2993772.ZMHUuAIlz7@xps13> (raw)
In-Reply-To: <1433974765-136411-1-git-send-email-damarion@cisco.com>
Helin, a comment?
2015-06-11 00:19, Damjan Marion:
> This patch improves performance of vectored rx on i40e devices.
>
> Signed-off-by: Damjan Marion <damarion@cisco.com>
> ---
> drivers/net/i40e/i40e_rxtx.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
> index 2de0ac4..152e9e6 100644
> --- a/drivers/net/i40e/i40e_rxtx.c
> +++ b/drivers/net/i40e/i40e_rxtx.c
> @@ -778,6 +778,11 @@ i40e_rx_alloc_bufs(struct i40e_rx_queue *rxq)
>
> rxdp = &rxq->rx_ring[alloc_idx];
> for (i = 0; i < rxq->rx_free_thresh; i++) {
> +
> + /* Prefetch next mbuf */
> + if (i < (rxq->rx_free_thresh - 1))
> + rte_prefetch0 (rxep[i+1].mbuf);
> +
> mb = rxep[i].mbuf;
> rte_mbuf_refcnt_set(mb, 1);
> mb->next = NULL;
>
next prev parent reply other threads:[~2015-07-10 14:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-10 22:19 Damjan Marion
2015-07-10 14:33 ` Thomas Monjalon [this message]
2015-07-10 15:24 ` Zhang, Helin
2015-07-10 16:18 ` Zhang, Helin
2015-07-10 17:18 ` Thomas Monjalon
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