Hello
We have two servers with openvswitch 1.7. They are on Centos 6.x with
2.6 kernel. For now they have 8 bridges with ~20 gre tunnels each. They
are BGP peers too, so they have ~600k routes in routing table.
Everything works fine, but we would like to update it because of low ovs
performance (no megaflows and multithreading)...
I installed Debian 8 with openvswitch 2.4 (2.3.1 tested too) and we have
one problem... When i add even one gre tunnel ovs go up too 70-90% cpu
usage, when i add more than 3 tunnels cpu is at 100% all the time (one
core). When i add more than 10 tunnels ovs starts to work veeeeery
slow... ovs-ofctl dump-flows need ~5 sec to show me empty flow table...
Adding next gre port takes 5-10 sec etc... And with every next port its
slow down more and more...
I was searching for problem for long and then... i stopped bgpd.
I understand now that there is a problem with new openvswitch and GRE
tunnels when there is big routing table. When we have ~50 routes in
routing table everything works fine. But when bgpd starts, ovs starts
choking...
Is there anything we can do? or we need to make something to not have so
much routes on server with OVS?
Regards
Krzysztof Wojciechowski
Tiktalik.com
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