[dpdk-users] high jitter in dpdk kni

Masoud Moshref Javadi masood.moshref.j at gmail.com
Sat Jan 23 15:17:49 CET 2016

I see jitter in KNI RTT. I have two servers. I run kni sample application
on one, configure its IP and ping an external interface.

sudo -E build/kni -c 0xaaaa -n 4 -- -p 0x1 -P --config="(0,3,5)"
sudo ifconfig vEth0

This is the ping result:
64 bytes from icmp_seq=5 ttl=64 time=1.93 ms
64 bytes from icmp_seq=6 ttl=64 time=0.907 ms
64 bytes from icmp_seq=7 ttl=64 time=3.15 ms
64 bytes from icmp_seq=8 ttl=64 time=1.96 ms
64 bytes from icmp_seq=9 ttl=64 time=3.95 ms
64 bytes from icmp_seq=10 ttl=64 time=2.90 ms
64 bytes from icmp_seq=11 ttl=64 time=0.933 ms

The ping delay between two servers without kni is 0.170ms.
I'm using dpdk 2.2.

Any thought on how to keep KNI delay predictable?


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