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

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Message-ID: <20130411182727.GM29861@linux.vnet.ibm.com>
Date:	Thu, 11 Apr 2013 11:27:27 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Arjan van de Ven <arjan@...ux.intel.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>, arnd@...db.de,
	Robin.Randhawa@....com, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH documentation 1/2] nohz1: Add documentation.

On Thu, Apr 11, 2013 at 10:14:28AM -0700, Arjan van de Ven wrote:
> >+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

Interesting point, and I freely admit that I don't have full knowledge
of the energy-consumption characteristics of all the architectures that
Linux supports.  Adding a few of the ARM guys on CC for their take,
plus linux-rt-users.

If there are no objections, I will delete point 2 above as Arjan suggests.

							Thanx, Paul

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