ports/138596: [MAINTAINER] sysutils/samesame vlruwk problem

[Alex de Kruijff]

This might be one of those bug reports where your anwser might be: sorry
not a bug but a feature.

I've run the app and the whole computer seem to freeze. I've rebooted
a couple times. Before I filed the PR, I've googled on vlruwk and it
seemed like this state indicated a big problem on the OS part.

Since then I have come to understand this better. What happens is that
the vnodes are running out, and FreeBSD responed to that by waiting a
couple seconds becore executing a anything. Thus it becomes
unresponcive.

I think the ideal solution would be if the OS would slow down the app
that is using a (very) large percentage of available vnodes, if it causes
the computer to run out of available vnodes.

I've also learned that the problem goes away if the value kern.maxvnodes
is raised by the administrator,  but in my case this needed to add at
least 200%.

# sysctl kern.maxvnodes = <kern.maxvnodes> + 10 000

I've run the app as root. And having root privileges this was easy for
me to do, once I knew how to respond to this.