[erlang-questions] Reasons not to enable kernel poll

[Alexey Romanov]

>From reading, e.g.
http://developer.sipphone.com/ejabberd/erlang_epoll_patch/, it seems
supposed to be a performance improvement which only some applications
can benefit from, but with no downsides. Presumably it's now
considered stable (after inclusion into OTP and 3 major versions).
Rebar enables it by default (see
https://github.com/basho/rebar/blob/master/priv/templates/simplenode.vm.args).
But why is it required to enable it and "+K true" isn't the default?
Are there circumstances when it's a bad idea to enable it?

Yours, Alexey Romanov