Hi all, we have an odd but very specific issue with GRE tunnels we’ve created using Openvswitch v2.1.2 on Centos 6.5 x64. We have created the interfaces and GRE tunnels fine as peer the simple and fairly standard instructions widely available, and once we insert an arp entry, we can ping endpoints fine, but although everything works just fine at first, we find that after a few days of uptime that when we ping endpoints, the icmp_seq goes from low random response times, to a cycle in which every 70 pings it resets to a set high value, 120ms, and gradually drops down to 22ms over the next 70 pings.
Further, ping response seems to be padded out where necessary to ensure it remains a cycle of 70 pings. Stopping, or restarting Openvswitch doesn’t fix it, but restarting networking and adding the static arp entry back in does. We’re at our wits end trying to determine the cause of this strange behaviour, is there some obscure cache setting in OVS that would cause this? Regards, Ian
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