On 09/26/2011 09:02 AM, Petr Cervenka wrote:
>
> Hello.
>
> I recently tried newer computer and I suprusingly realized that it is bigger
> load than the old one with our xenomai application.
> The problem is in the frequency downscaling of the processor when the load in
> under 100%.
> Of course I have disabled CPU_FREQ, ACPI_PROCESSOR and INTEL_IDLE as
> suggested.
> Later I tried also to disable CPU_IDLE, 7300_IDLE (intel chipset idle memory)
> and all power efficiency settings in the BIOS, but without success.
> The experienced behaviour is following:
> when the process is waiting for an event, the processor lowers its frequency
> and when the event happens it tries to restore (slowly) its nominal frequency.
>
> Do you have any advice or tip what to try, because I'm really desperate?
Have you tried:
- enabling SMI workaround (and do not forget to check the boot logs to
check that it actually works with the chipset you use);
- if that fails, adding "idle=poll" to kernel arguments?
--
Gilles.
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