On 3/20/2013 5:27 PM, Steven Rostedt wrote:I'm not sure I would recommend idle=poll either. It would certainly
work, but it goes to the other extreme. You think NO_HZ=n drains a
battery? Try idle=poll.
do not ever use idle=poll on anything production.. really bad idea.
if you temporary cannot cope with the latency, you can use the PMQOS system
to limit (including going all the way to idle=poll).
but using idle=poll completely is very nasty for the hardware.
In addition we should document that idle=poll will cost you peak performance,
possibly quite a bit.
the same is true for the kernel paramter to some extend; it's there to work around
broken bioses/hardware/etc; if you have a latency/runtime requirement, it's much better
to use PMQOS for this from userspace.