Marek Kozlowski wrote:
> My system is not overloaded and - in many aspects quite typical one.

Great!  I believe you.  But then there was absolutely no reason to
double a limit that would never have been hit.  If the system is not
overloaded the the initial fork() will always succeed and there will
never be any retries.  Not five and therefore not ten either.

> If I had to double some value something very strange must have
> occurred. I'm wondering what was it (a black hole in my memory).

That you did double that limit that was not getting hit (not getting
hit because your system was not overloaded) then it changed something
that had no effective change.  In that case it was a noop.  Because
you were not hitting that limit.  Because your system was not
overloaded.

And therefore there was no effect by changing it.  That it was changed
was likely simply a misunderstanding at that time.  But now that it is
later and we all have had more sleep since then and looking at it
fresh we can see that it was simply a mistake.  No big deal.  Nothing
to see.  I make mistakes all of the time!  And now that we know we
should remove it from the local configuration and let it drop back to
the default as part of the cleanup back to the mainstream.

Bob

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