Hi Len, Rafael, and all, AMD proposed a new instruction named mwaitx. This is an extension of mwait with a configurable timer (mwaitx = mwait + timer). And mwaitx will act as mwait if timer is disabled. However, mwait/mwaitx cannot let cpu core go to C1 state at current AMD processors, but has less power consumption even at C0 while core is waiting. As you know, mwait/mwaitx would have better performance than halt. So could we propose an implementation to use mwaitx at idle call in boot phase and cpuidle driver after boot phase. And the mwaitx idle is exposed to user as an optional kernel parameter(idle=...), and decided by user.
Any comments are warm for me :) Thanks, Rui -- 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/
