[dpdk-dev] [PATCH] app/testpmd: add packet data prefetch in macswap loop
De Lara Guarch, Pablo
pablo.de.lara.guarch at intel.com
Mon May 2 19:48:02 CEST 2016
Hi Jerin,
> -----Original Message-----
> From: Jerin Jacob [mailto:jerin.jacob at caviumnetworks.com]
> Sent: Monday, May 02, 2016 1:00 PM
> To: dev at dpdk.org
> Cc: De Lara Guarch, Pablo; Jerin Jacob
> Subject: [dpdk-dev] [PATCH] app/testpmd: add packet data prefetch in
> macswap loop
>
> prefetch the next packet data address in advance in macswap loop
> for performance improvement.
>
> Signed-off-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
> ---
> app/test-pmd/macswap.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/app/test-pmd/macswap.c b/app/test-pmd/macswap.c
> index 154889d..c10f4b5 100644
> --- a/app/test-pmd/macswap.c
> +++ b/app/test-pmd/macswap.c
> @@ -113,6 +113,9 @@ pkt_burst_mac_swap(struct fwd_stream *fs)
> if (txp->tx_ol_flags & TESTPMD_TX_OFFLOAD_INSERT_QINQ)
> ol_flags |= PKT_TX_QINQ_PKT;
> for (i = 0; i < nb_rx; i++) {
> + if (likely(i < nb_rx - 1))
> + rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i + 1],
> + void *));
> mb = pkts_burst[i];
> eth_hdr = rte_pktmbuf_mtod(mb, struct ether_hdr *);
>
> --
> 2.1.0
This looks good. Could you also add it in the other forwarding modes (the ones that make changes in the packets)?
Thanks,
Pablo
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