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:

quoted

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