Hi all,
I?m sending packet by rte_eth_tx_burst() function. With 1Gbps NIC, I
just get 100Mbps speed.
I use the following code to send packets (In order to send packets, I
keep calling rte_eth_tx_burst).
for (i=0; i < BURST_SIZE;){
i = i + rte_eth_tx_burst(port, queue, buffer + i, BURST_SIZE - i);
}
My NICs are ?Intel Corporation 82572EI Gigabit Ethernet Controller
(Copper) (rev 06)? and ?Intel Corporation 82576 Gigabit Ethernet Connection
(rev 01)?. When I get the link state through DPDK, the link_speed is 1000.
I try testpmd with the instructions of ?http://dpdk.org/doc/quick-start
<http://dpdk.org/doc/quick-start>?. It works well. No dropped packets.
When I send packets with 60 bits length, the rate is only about 140000
pps. When I send packets with 1500 bits length, the rate is about 8000 pps. I
only get 100Mbps sending speed.
My OS is ?Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.81-1 x86_64 GNU/Linux?.
I tried DPDK-2.2.0 and DPDK-16.07. The results are same.
I also found a strange thing. If I send the packet that has the
destination MAC same with the MAC address of the NIC that sends the packet, I
can get 1.4Mpps with the 60-bit-length packets.
I profile the sending program with gperf. The ?rte_delay_us? consumes
more than 90% running time. But I don?t know the caller of ?rte_delay_us?. In
the output of gperf, ?rte_delay_us? is ?spontaneous?.
I don?t know why I cannot get 1Gbps send speed. Did anyone meet the
similar issue? How to address it?
Best regards,
-xiaozhe
