Re: [ANNOUNCE] 3.0.1-rt8

From: Paul E. McKenney
Date: Tue Aug 09 2011 - 21:08:43 EST

On Tue, Aug 09, 2011 at 08:47:26PM +0200, Peter Zijlstra wrote:
> On Tue, 2011-08-09 at 11:31 -0700, Fernando Lopez-Lezcano wrote:
> > Hmmm, what are reasonable values for CONFIG_RCU_BOOST_PRIO and
> > CONFIG_RCU_BOOST_DELAY? (or at least what are you using?).
> I'm using the defaults, since I haven't actually got a workload besides
> compiling kernels ;-)
> Changing these values is very much workload dependent, the PRIO should
> be high enough not to cause memory starvation, but low enough not to
> disrupt anything important, and thus completely dependent on you
> favourite RT workload.
> The same goes for the DELAY, too long and you run out of memory, too
> short and you get more overhead, depends on your workload, your machine
> memory size etc..
> Paul should of course be put on trial for giving us these knobs, but
> seeing where they come from I totally understand they exist ;-)

You mean my experience at the tail end of 3.0 -wasn't- being put
on trial? ;-)

Thanx, Paul
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