[ovs-discuss] Packet drop on OVS-DPDK bridges

[Rapelly, Varun]

Hi Team,

I created OVS bridges [on RHEL 7]using the attached Init.sh script [Using ovs-branch 2.4 and DPDK-2.0. Not using 1GB huge pages].

Then I created a KVM instance  and used mactap devices [created by ovs bridge] in that VM instance. I had installed my application on new VM instance and I was able to do the things[calls] successfully. But when I started pumping load, observed good number of call failures.

Then I checked the stats on the OVS bridges and found good number drop count.

[root at artha utilities]# ./ovs-vsctl get Interface pktovs statistics
{collisions=0, rx_bytes=3020971673, rx_crc_err=0, rx_dropped=59038515, rx_errors=0, rx_frame_err=0, rx_over_err=0, rx_packets=13956397, tx_bytes=27949373215, tx_dropped=340854, tx_errors=0, tx_packets=130762243}

Please clarify:
1. What this drop count implies? If it is a problem, then how to overcome this problem?[ by increasing any ring or mbuf sizes??]
2. Do we need to change any buffer ring/size based on traffic on OVS bridges?

Regards,
Varun

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