Hi,
I have an issue with DPDK 24.11.1 and 2 port 100G Intel NIC (E810-C) on 22 core
CPU dual socket server.
There is a dedicated CPU core to get the packets from DPDK using
rte_eth_rx_burst() and enqueue the mbufs into a worker ring Q. This thread
does nothing else. The NIC is dropping packets at 8.5 Gbps per port.
Studying the perf report, I was interested in the common_ring_mc_dequeue().
Perf tool shows common_ring_mc_dequeue() 92.86% Self and 92.86% Children.
I see further with perf tool rte_ring_enqueue_bulk() and
rte_ring_enqueue_bulk_elem(). These are at 0.00% Self and 0.05% Children.
Perf tool shows rte_ring_sp_enqueue_bulk_elem (inlined) which is what I wanted
to see (Single producer) representing the enqueue of the mbufs pointers to the
worker ring Q.
Is it possible to change the common_ring_mc_dequeue() to
common_ring_sc_dequeue()? Can it be set to one consumer on single Queue 0.
I believe this is limiting DPDK from reaching 90 Gbps or higher in my setup,
which is my goal.
I made sure the E810-C firmware was up to date, NIC FW Version: 4.80 0x80020543
1.3805.0
Perf report shows:
- 99.65% input_thread
- 99.35% rte_eth_rx_burst (inlined)
- ice_recv_scattered_pkts
92.83% common_ring_mc_dequeue
Any thoughts or suggestions?
Thanks,
Ed
