On Thu, 2013-02-28 at 14:38 +0800, Michael Wang wrote: > + /* > + * current is the only task on rq and it is > + * going to sleep, current cpu will be a nice > + * candidate for p to run on. > + */
The sync hint only means it might be going to sleep soon, and even then, there can still be enough execution overlap to be a win to schedule cross core. Sched pipe numbers will always be much prettier if you do wakeup cpu affine, as it's ~100% scheduler and ~100% sync. You may lose a lot on other stuff if you interpret the hint as gospel truth. IMHO, sched pipe is a "how fat have I become" benchmark, not "how well do I perform". The scheduler performs well when it makes more work happen. Playing ping-pong with yourself is _exercise_, not a job :) -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
