Upgrade to 1.6.3

[Michal]

Hi,

I was trying to upgrade my bird instance from v1.6.0 to v1.6.3 today. 
Unfortunately immediately after start the bird started generating these 
messages

2016-12-30 12:02:35 <INFO> Started
2016-12-30 12:02:43 <WARN> I/O loop cycle took 8679 ms for 8 events
2016-12-30 12:02:43 <WARN> Kernel dropped some netlink messages, will 
resync on next scan.
2016-12-30 12:02:43 <WARN> Kernel dropped some netlink messages, will 
resync on next scan.
2016-12-30 12:02:52 <WARN> Kernel dropped some netlink messages, will 
resync on next scan.
2016-12-30 12:03:03 <WARN> Kernel dropped some netlink messages, will 
resync on next scan.
2016-12-30 12:03:10 <WARN> Kernel dropped some netlink messages, will 
resync on next scan.
2016-12-30 12:03:16 <WARN> Kernel dropped some netlink messages, will 
resync on next scan

It's a full BGP IPv4 instance with just three interfaces. Tested on 
linux kernels 4.4 or 4.8. Package is from cznic deb repository.

I can see the warning log line was added at Dec 20 2016, which ended up 
in 1.6.3 release. Hence this was happening probably even before the 
upgrade, but it was not visible.

So the question is simple. Does it means there is something terribly 
wrong with my machine, or the high rate of this warning is expected?

Cheers
Michal