Re: [PATCH] nohz1: Documentation
From: Arjan van de Ven
Date: Thu Mar 21 2013 - 11:45:29 EST
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.
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