------------------------------------------------------------------------1. It increases the number of instructions executed on the path to and from the idle loop. 2. On many architectures, dyntick-idle mode also increases the number of times that clocks must be reprogrammed, and this reprogramming can be quite expensive.
it's really that we're no longer using periodic clocks, but only one-shot clocks only. (which then leads to having to program them every time) but arguably, that's because of HRTIMERS more than NOHZ (e.g. I bet we still turn off periodic even for nohz as long as hrtimers are enabled) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
