Help with understanding IF Drops and Fragment issues

[nirhenn]

Hi all,

Need help with guide how to troubleshoot IF Drops and Fragment issues. I am running with Opencontrail 3.0.2 w/DPDK. When running a load in L2 inside a single node (all VMs are located on the same compute node) I can notice that once I pass the 18 Gbps traffic I can see IF Drops and Fragment errors and connection to VM get staggering.

I use isolcpu=0-3 on the first NUMA 0 for vrouter-dpdk and hugepages 1G in grub. The strange thing is that i do see the first 4 cores in 100%, almost constantly, but in the process lines I see 10 to 11 routers-dpdk process, but only 4 are in 100 and the rest are 0. x only, is it normal? Also, those processes that are 0.x are not running on core 0-3, is it normal, even if the vrouter-dpdk.ini taskset is set to -c 0,1,2,3?

What are the steps to identify from where the issues source from?

Nir.