From: Carl T. <ce...@ca...> - 2003-03-14 07:24:02
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Quoting "Grover, Andrew" <and...@in...>: > > From: Carl Thompson [mailto:ce...@ca...] > > Is it possible this machine just doesn't do C2-C3, processor limit > > control or processor performance control? If that is the case, then > > why does Windows seem to be running cooler? The fan is often off > > in Windows but never off in Linux. Also battery life seems to be > > better in Windows whereas on my other laptops it's better in Linux. > > And yes, I am using CPUFreq's PowerNow support to throttle down the > > CPU speed and voltage to the minimum. > > Does the system feel slow, or are there an abnormal number of > interrupts shown in /proc/interrupts? No, the system operates correctly and the interrupts seem reasonable. > Also, the latest code required that the Processor P_BLK have a length > of 0 or 6, without exception. I'm not sure what this is, how I would check it or what I can do about it. > Finally, C2 and C3 statistics should be exposed through perfmon under > Windows. You might try finding that information, and seeing if indeed > it is using C2 or C3. Thanks for the info. According to perfmon, Windows goes into C2 when idle, but never into C3. So C2 is in fact supported on this hardware. > ... This is what I get in /proc/acpi/processor/CPU0: [carl@Tweak carl]$ cd /proc/acpi/processor/CPU0 [carl@Tweak CPU0]$ ls info limit performance power throttling [carl@Tweak CPU0]$ cat info processor id: 0 acpi id: 0 bus mastering control: yes power management: no throttling control: no performance management: no limit interface: no [carl@Tweak CPU0]$ cat limit <not supported> [carl@Tweak CPU0]$ cat performance <not supported> [carl@Tweak CPU0]$ cat power active state: C1 default state: C1 bus master activity: 00000000 states: *C1: promotion[--] demotion[--] latency[000] usage[00000000] C2: <not supported> C3: <not supported> [carl@Tweak CPU0]$ cat throttling <not supported> > Regards -- Andy Thank you, Carl Thompson |