From: Moon-Sang Lee <sang0627@gmail.com>
To: dev@dpdk.org
Subject: [dpdk-dev] rte_prefetch0() is effective?
Date: Thu, 24 Dec 2015 15:35:14 +0900 [thread overview]
Message-ID: <CAACK=Xe4HtqjmOkuscbpWGs2NzPQjEmsUxvhhLih5cX1d5MXSQ@mail.gmail.com> (raw)
I see codes as below in example directory, and I wonder it is effective.
Coherent IO is adopted to modern architectures,
so I think that DMA initiation by rte_eth_rx_burst() might already fulfills
cache lines of RX buffers.
Do I really need to call rte_prefetchX()?
nb_rx = rte_eth_rx_burst(portid, queueid, pkts_burst,
MAX_PKT_BURST);
...
/* Prefetch and forward already prefetched packets */
for (j = 0; j < (nb_rx - PREFETCH_OFFSET); j++) {
rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[
j + PREFETCH_OFFSET], void *));
l3fwd_simple_forward(pkts_burst[j], portid,
qconf);
}
--
Moon-Sang Lee, SW Engineer
Email: sang0627@gmail.com
Wisdom begins in wonder. *Socrates*
next reply other threads:[~2015-12-24 6:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-24 6:35 Moon-Sang Lee [this message]
2016-01-13 11:34 ` Bruce Richardson
2016-01-13 15:17 ` Polehn, Mike A
2016-01-13 17:29 ` Matthew Hall
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