linux-kernel - Re: [PATCH documentation 1/2] nohz1: Add documentation.

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Message-ID: <5166EF74.4030106@linux.intel.com>
Date:	Thu, 11 Apr 2013 10:14:28 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	edumazet@...gle.com, darren@...art.com, fweisbec@...il.com,
	sbw@....edu, Borislav Petkov <bp@...en8.de>,
	Kevin Hilman <khilman@...aro.org>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH documentation 1/2] nohz1: Add documentation.

> +2.	Many architectures will place dyntick-idle CPUs into deep sleep
> +	states, which further degrades from-idle transition latencies.
> +
I think this part should just be deleted.
On x86, the deeper idle states are even used with non-tickless system (the break even times are
quite a bit less than even 1 msec).
I can't imagine that ARM is worse on this, at which point the statement above is highly dubious


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