Re: Droping UDP traffic

On 1.8.2020 г. 14:43 ч., Stuart Henderson wrote:
> On 2020-07-31, Ivo Chutkin <openbsd@bgone.net> wrote:
>> Hello guys,
>>
>> Thanks for suggestions.
>>
>> Tweacking sysctl
>>
>> net.inet.udp.recvspace=131072
>> net.inet.udp.sendspace=131072
>>
>> solved the problem.
>>
>> Test between routers that started to drop packets over 10Mbit, now run
>> test at 100Mbit with less than 1% drops (over 50% before).
>
> net.inet.udp.recvspace and net.inet.udp.sendspace only affect traffic
> generated on a machine itself, they do not affect forwarded traffic.
>
> Generating packets on the router itself isn't a good test for how well
> they can forward packets.
>
>

Hi Stuart,

I have read it many times that increasing the values do not affect
forwarding performance. That is is why I was skeptical about calomel.org
solution.

Can you point some directions for increasing forwarding performance?

I upgraded all routers to 6.7 with patches and I think problem
disappears, using the same hardware.

Thanks for your help,
Ivo