On 06/13/2011 12:44 PM, Jakub Nowacki wrote:
> Dear All,
>
> I've recently installed Xenomai for our RT lab machine that uses RTXI
> (http://www.rtxi.org/). I followed the installation instruction on the
> web page but I got a number of issues in the process. Just to set some
> common ground: the machine is mentioned i7-870 on Intel's Q57 board; the
> setup is done for kernel 2.6.37.6 on Xubuntu 11.04 with the latest
> stable Xenomai (2.5.6) and Adeos patch. As for myself, I have some
> experience with Linux kernel setup but I'm not an expert.
>
> Before I found that the Intel's white paper describing Xenomai
> installation [Ugal 2009] shouldn't be used, I followed some suggestions
> there and disabled power management (PM) completely. The kernel compiles
> without any problems and works fine, but I the system sees only 4 out of
> 8 cores (just a reminder that i7-870 has 4 cores but 8 threads that are
> normally visible as CPUs). It is not end of the world for me at this
> point and the system seems to work fine (I have low latencies etc.) but
> I wanted to fix that.
>
> I've started to read into the installation and other resources, and
> disabled only the important bits, i.e. CONFIG_CPU_FREQ,
> CONFIG_ACPI_PROCESSOR, CONFIG_INTEL_IDLE; the rest of the kernel is
> pretty much generic Ubuntu config (I used
> https://wiki.ubuntu.com/KernelTeam/GitKernelBuild as a reference). The
> outcome is that machine now seems to have all cores but just after login
> the system freezes completely (without running anything related with
> Xenomai, just a couple of seconds after each login into Xfce). I
> actually managed to find on the mailing list that it can be caused by
> CONFIG_HPET_TIMER but I'm not able to disable it. Meaning, it is
> excluded from config GUIs (I've tried practically all of them) and if I
> change it manually in the .config file, it just somehow switches back to
> being enabled when I compile the kernel.
> BTW I've tried the APIC options from the FAQ, but they do not fix the
> freezing. Also, HPET_TIMER is enabled in the previous kernel config
> where I disable whole PM, and the system seems to work fine with it.
>
> Also I had similar problem with CONFIG_PCI_MSI, namely, it is blocked
> (cannot be disabled) in the GUI when PM is enabled (or something there,
> I'm not sure). But than later in the HPET thread I've found that I
> should leave MSI enabled, hence, I'm not sure what should I do here.
>
> Moreover, there is a problem with CONFIG_APM in this kernel, namely, it
> seems to not be there. I'm not sure if it just does not exist for the
> new kernel or I'm not doing something right.
>
> Do you have any suggestions? I can provide you with the config file.
> Also, I can try doing some test and debugging if it's needed.
Please post your .config.
--
Gilles.
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