Mike, > It's looking like my Q6600 is kinda slow at switching gears, and I'd > just like to verify that it is the hardware, not something odd going on > in cpuidle territory. Yes, it's the CPU. It is a known restriction of this processor and has been verified on a number of different systems. It appears that the processor is halted while the PLL is stabilizing. However, there is no formal confirmation from Intel AFAIK. It happens that one of the test systems that we regularly use in the quality assessment of the PREEMPT_RT patch is a Q6600: # grep CPU /proc/cpuinfo model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz The recommendation is to add -=--------------------------------------=- cd /sys/devices/system/cpu for i in cpu?/cpufreq/scaling_governor do echo performance >$i done cd - -=--------------------------------------=- to /etc/rc.d/rc.local and to abandon dynamic frequency scaling on such systems. Carsten. -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
