Upgrade to 1.6.3

[Michal]

Stupid... increasing read buffer helped of course

sysctl -w net.core.rmem_default=1064960

I see, the bird is not increasing the read buffer on it's netlink 
socket. Would it be bad idea to create an configuration option for that?

On 2016-12-30 12:27, Michal wrote:
> 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