Hi,

We see 40% traffic drop with UDP traffic over VxLAN and 20% traffic drop with 
UDP traffic over MPLSoGRE between OVS 2.8.2 & OVS 2.12.1.

We narrowed the drop in performance in our test is due to below commit and 
backing out the commit fixed the performance drop problem.

The commit of concern is :
https://github.com/openvswitch/ovs/commit/967bb5c5cd9070112138d74a2f4394c50ae48420
commit 967bb5c5cd9070112138d74a2f4394c50ae48420
Author: Darrell Ball <dlu...@gmail.com<mailto:dlu...@gmail.com>>
Date:   Thu May 9 08:15:07 2019 -0700
 conntrack: Add rcu support.
We suspect 'ct->ct_lock' lock taken to do 'conn_update_state' and for 
conn_key_lookup could be causing the issue.
Anyone noticed the issue and any pointers on fix? We could not get any obvious 
commit that could solve the issue. Any guidance in solving this issue helps?
Thanks
Kiran

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