linux-kernel - Re: [PATCH] nohz1: Documentation

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Message-ID: <20130322162820.GN3637@linux.vnet.ibm.com>
Date:	Fri, 22 Mar 2013 09:28:20 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Rob Landley <rob@...dley.net>, linux-kernel@...r.kernel.org,
	josh@...htriplett.org, zhong@...ux.vnet.ibm.com,
	khilman@...aro.org, geoff@...radead.org, tglx@...utronix.de
Subject: Re: [PATCH] nohz1: Documentation

On Fri, Mar 22, 2013 at 02:38:58PM +0000, Christoph Lameter wrote:
> On Thu, 21 Mar 2013, Paul E. McKenney wrote:
> 
> > So, how long of busy periods are you contemplating for your SCHED_FIFO
> > threads?  Is it possible to tune/adjust the offending per-CPU ktheads
> > to wake up less frequently than that time?
> 
> Test programs right now run 10 seconds. 30 seconds would definitely be
> enough for the worst case.

OK, that might be doable for some workloads.  What happens when you
try tuning the 2-second wakeup interval to (say) 45 seconds?

							Thanx, Paul

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