[cfarm-users] Max UDP dgram size on M1 machine (gcc304)

[Segher Boessenkool]

On Wed, Mar 24, 2021 at 08:39:10AM -0700, Kaz Kylheku via cfarm-users wrote:
> On Mac OS, there are, by default, bizarre restrictions on IP datagram 
> sizes
> in the protocol stack.
> 
> Would it be possible to put this configuration into effect:
> 
>    sysctl -w net.inet.udp.maxdgram=65535

The default is not a restriction, but meant for good performance:
it is 9216, which is the maximum MTU for any supported network
interface.

If you use something bigger, you get way worse performance (up to and
including 0 bits per second) if the network is a bit busy, drops some
packets, etc.


Segher