On 08/04/2016 01:36 PM, Armando M. wrote:
Hi Neutrinos,

I have noticed that Liberty seems to be belly up [1]. I wonder if anyone knows
anything or has the time to look into it.

Many thanks,
Armando

[1] https://review.openstack.org/#/c/349039/

This could be due to this backport;

https://review.openstack.org/#/c/347062/

Before we were doing 'ping -c 3 -W 1 $IP', which will succeed as long as one packet is returned.

Now there is an outer loop that runs 'ping -c 1 -W 1 $IP', so a single dropped packet could cause an error. Since sometimes that first packet causes ARP to happen, any delay near the 1-second mark looks like a lost packet, but is really just transient and packets 2 and 3 are fine.

I've started a revert and will recheck, but if I'm right an async issue like this is hard to reliably reproduce - I had to use iptables directly to test my theory about the return code from ping when 1/3 packets were lost.

-Brian

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