IPv6 BGP & kernel 4.19

[Andrew Hearn]

On 01/12/2019 18:20, Clément Guivy wrote:
> On 01/12/2019 13:43, Frederik Kriewitz wrote:
>> This is our current suspicion too. neighbours and routes are well
>> below 4096 in our case. We also had to adjust
>> net.ipv6.neigh.default.gc_thresh1/2/3. Since the adjustment it's been
>> working fine.
>>
> 
> Hi, that's good news. One thing that still confuses me though is that
> the default values for these settings are the same in Debian 9 (4.9
> kernel) and Debian 10 (4.19 kernel), so I would expect the behaviour to
> be the same between both versions in that regard.
> Also I'm not sure to understand what this max_size parameter actually
> does since I have it to default value (4096), and yet ipv6 route table
> at the moment is >70k entries large without the kernel complaining.

To add our info -

We're using Intel 82599ES NICs.

We have full table on v4 and v6, and about 20 neighbors on each.

Our route/max_size for v4 and and v6 are defaults (2M and 4096
respectively) - and as noted, these values are the same in our Stretch
and Buster boxes.

Andrew