The current "official" position is at
http://jackaudio.org/linux_rt_config
and it would be really helpful if other replies to similar questions
in the future just point people there.
It is also true that (oddly) JACK and Ardour do not see eye-to-eye on
the correct setting for memlock. I will rectify that in the next
release of one of them. Its also true that Ardour's message only kicks
in if you memlock less than 75% of your physical RAM, which it uses a
very vague heuristic for a "reasonable setting".
To expand (again) on something mentioned on that FAQ page and earlier
in thread and in other threads: nice(1) is not just "no longer
necessary", it was NEVER necessary, NEVER had anything to with proper
scheduling of realtime threads, and should NEVER be discussed in
connection with JACK and its clients. It is very unfortunate that the
myth that nice is somehow related to all this stuff has propagated so
far and wide - the myth is false, was always false and will always be
false. Please do not mention nice to people in connection with audio
application scheduling and please correct other people when they do.
Its unfortunate that even people like Linus Torvalds fall into this
bad habit, although he will at least admit the mistake when pushed.
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