Thursday, September 8, 2016

[fedora-arm] Re: Fedora 24 Mate Spin fails to start all cpus on Odroid-Xu4

On Thu, Sep 8, 2016 at 1:57 PM, Stewart Samuels <searider74@gmail.com> wrote:
> Thanks Peter,
>
> This will be very disappointing if we cannot enable all the cpus.
>
> BTW, when you refer to upstream here, is it the Redhat team or the Kernel
> team beyond?

Never Red Hat. Fedora is upstream to Red Hat, so upstream means the
linux kernel upstream at kernel.org and the kernel at large.

> On 09/08/2016 08:40 AM, Peter Robinson wrote:
>>
>> On Thu, Sep 8, 2016 at 1:19 PM, Stewart Samuels <searider74@gmail.com>
>> wrote:
>>>
>>> Hi Peter,
>>>
>>> I am not doing anything with the system other than booting up and logging
>>> in. This is true for the Ubuntu build as well.
>>>
>>> Where are these policies set and can you provide any me any direction for
>>> documentation on them? seeming these are distro specific, I would expect
>>> something relative to Fedora.
>>
>> Nope, they are upstream kernel (and possibly even upstream u-boot)
>> specific. The only default we set in this regard that may, or may not,
>> be Fedora specific is we use the On Demand governor as the default.
>> This is architecture in dependent default across Fedora.
>>
>> I doubt the Ubuntu build ships an upstream mainline kernel but then I
>> don't follow any of what they do so TBH not sure there, I also have no
>> idea what they set their default policy to.
>>
>> So doing a quick google for "cpufreq" I get some of the following
>> links that look remotely relevant, no idea how much they are, sorry.
>>
>>
>> https://docs.fedoraproject.org/en-US/Fedora/15/html/Power_Management_Guide/cpufreq_governors.html
>> https://wiki.archlinux.org/index.php/CPU_frequency_scaling
>> https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt
>> https://www.pantz.org/software/cpufreq/usingcpufreqonlinux.html
>> http://www.ibm.com/developerworks/library/l-cpufreq-1/index.html
>> https://wiki.debian.org/HowTo/CpuFrequencyScaling
>>
>>> On 09/08/2016 05:29 AM, Peter Robinson wrote:
>>>>
>>>> On Wed, Sep 7, 2016 at 8:44 PM, Stewart Samuels <searider74@gmail.com>
>>>> wrote:
>>>>>
>>>>> Hi Peter,
>>>>>
>>>>> Here is the result of lscpu.
>>>>>
>>>>>
>>>>>
>>>>> ---------------------------------------------------------------------------------------
>>>>> [root@myodroid ~]# lscpu
>>>>> Architecture: armv7l
>>>>> Byte Order: Little Endian
>>>>> CPU(s): 8
>>>>> On-line CPU(s) list: 0-4
>>>>> Off-line CPU(s) list: 5-7
>>>>> Thread(s) per core: 1
>>>>> Core(s) per socket: 2
>>>>> Socket(s): 2
>>>>> Model name: ARMv7 Processor rev 3 (v7l)
>>>>> CPU max MHz: 1300.0000
>>>>> CPU min MHz: 200.0000
>>>>>
>>>>>
>>>>> ----------------------------------------------------------------------------------------
>>>>>
>>>>> Is there any way to enable these other cpus? My Ubuntu 16.04
>>>>> installation
>>>>> has them all enabled and the Ubuntu responsiveness is much quicker. I
>>>>> suspect this has something to do with it.
>>>>
>>>> So it's shut them off, it's something with the way the big.LITTLE
>>>> stuff works, so it's basically as expected. I believe it's handled as
>>>> part of the cpufreq policies from user space but I've done little with
>>>> the b.L stuff so I'm not sure. I'd try with the performance policy
>>>> first.
>>>>
>>>> In terms of speed vs other distros, it would likely depend on a lot
>>>> more than just the cores that are running but I have no idea what
>>>> you're doing with it (remote server/desktop/what ever) so there's
>>>> likely a lot that will come into play.
>>>
>>>
>
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