Hi VPP team.
I create a simple VPP node name "swap_mac". "swap_mac" node just swap between
source and destination MAC address and send packet back.
Then, I use Pktgen tool to send packet to VPP. In VPP, the packet will go to
swap_mac->interface-output node and finally send back Pktgen tool.
I found out with this test model, VPP throughput can go up *7Gbps* in my lab.
But VPP throughput just is *300Mbps* when I add a counter variable to count
number of received packet and a printf() to print value of counter in
"swap_mac" node function.
My code:
counter ++
if((counter % 600.000.000) == 0)
{
printf("Receive packets: %ld", counter );
}
So, why VPP throughput change from 7Gbps to 300Mbps when I just call printf()
function every 600.000.000 packets?
( I have tried to comment out printf() , VPP throughput go up 7Gb again. )
Please help me to see it. I'm sorry for my bad English.
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