On Wed, 2010-01-20 at 14:04 -0600, Joel Schopp wrote:Yes.
On Power7 processors running in SMT4 mode with 2, 3, or 4 idle threads there is performance benefit to idling the higher numbered threads in
So this is an actual performance improvement, not only power savings?
And you just wrecked x86 ;-)
It has an smt_power implementation that tries to measure smt gains using
aperf/mperf, trouble is that this represents the actual performance not
the capacity. This has the problem that when idle it represents 0
capacity and will not attract work.
Coming up with something that actually works there is on the todo list,
I was thinking perhaps temporal maximums from !idle.
So if you want to go with this, you'll need to stub out