[dpdk-dev] rte_eth_rx_burst only returns up to 32 packets
Masoud Moshref Javadi
masood.moshref.j at gmail.com
Fri Aug 28 21:04:12 CEST 2015
The documentation of this method says: Applications implementing a
"retrieve as much received packets as possible" policy can check this
specific case and keep invoking the rte_eth_rx_burst()
until a value less than nb_pkts is returned.
But the function returns at most 32 packets regardless of the burst size
parameter (nb_pkts). For example when I set the burst size to 256, it
only returns 32 packets even though the queue has more packets. This
means that I cannot rely on the returned value to know if there are >
256 packets in the queue or not.
Where this number 32 comes from? Is it because "PMD:
ixgbe_set_rx_function(): Vector rx enabled, please make sure RX burst
size no less than 32." ?
I use DPDK 2.0.0 and Intel 82599 10 G NIC.
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