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List:       openvswitch-discuss
Subject:    [ovs-discuss] ICMP_SEQ resets every 70 pings and counts down from a set value
From:       jesse () nicira ! com (Jesse Gross)
Date:       2014-08-25 19:42:16
Message-ID: CAEP_g=-JQuDVp2ZNmx3sGmfWofeakuOnNK1cKRk_eL+EWSo8RA () mail ! gmail ! com
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On Sun, Aug 24, 2014 at 7:24 PM, aarggh @aarggh.com <aarggh at gmail.com> wrote:
> 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?

It seems somewhat unlikely that this is caused by OVS.

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