Hi,
I just got a Nehalem CPU and it works OK except that the fans are always
running full power and it produces heat like an oven.
$ cat /proc/acpi/processor/P001/info
processor id: 0
acpi id: 1
bus mastering control: yes
power management: yes
throttling control: no
limit interface: no
$
Oh, no throttling and no limit support? How can this be? I'm using
2.6.30 but this appears to be bogus; Windows scales down the CPU
frequency OK.
Does this mean my BIOS ACPI tables are bogus?
I get this message at boot time, but it appears to be unrelated:
ACPI Warning (tbutils-0246): Incorrect checksum in table [OEMB] - 00, should be FE [20090320]
Any ideas what I could do now to get the CPU to slow down?
Thanks,
Felix
Felix von Leitner wrote:
> Any ideas what I could do now to get the CPU to slow down?
What cpu frequency governor are you using?
Take a look in /sys/devices/system/cpu/cpu0/cpufreq/. I'd suggest ensuring
you're using the "ondemand" governor as a first step in managing CPU
speed.
Cheers,
FJP
On Sat, 4 Jul 2009 22:37:32 +0200
Felix von Leitner <[email protected]> wrote:
> Hi,
>
> I just got a Nehalem CPU and it works OK except that the fans are
> always running full power and it produces heat like an oven.
>
> $ cat /proc/acpi/processor/P001/info
> processor id: 0
> acpi id: 1
> bus mastering control: yes
> power management: yes
> throttling control: no
> limit interface: no
> $
>
> Oh, no throttling and no limit support? How can this be? I'm using
> 2.6.30 but this appears to be bogus; Windows scales down the CPU
> frequency OK.
how do you determine linux isn't scaling down? PowerTOP?
(if not powertop.. you might want to use that ;-)
> ACPI Warning (tbutils-0246): Incorrect checksum in table [OEMB] -
> 00, should be FE [20090320]
that's pretty bad, but might not be a table critical for C/P states...
--
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