[dpdk-dev] Requirement of minimum Rx burst size for PMDs
Yongseok Koh
yskoh at mellanox.com
Fri Oct 20 03:18:18 CEST 2017
Hi,
In some rx_burst functions, especially for vectorized ones (e.g. i40e_rxtx_vec*
or mlx5_rxtx_vec*), there's actually a requirement of min burst size.
As it manipulates 4 packets simultaneously in a loop, if nb_pkts of
rte_eth_rx_burst() is less than 4, it just returns without sending a packet.
One way to handle it could be falling back to regular rx_burst in such cases but
the burst size isn't a fixed/static parameter but applications can dynamically
change it when it polls a device. So, it might not be a good option.
Therefore, how about adding min_rx/tx_burst_sz in struct rte_eth_dev_info and
have PMDs fill it in on dev_ops->dev_infos_get() so as to make apps comply with
it.
Because the max size of a burst can be handled well by PMD, it may not be
necessary.
Thoughts?
Thanks,
Yongseok
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