[debian-yeeloong-project] [loongson-dev] System logs for Loongson 3A machine

[Huacai Chen]

Hi,

We design CPUAutoplug for power saving in kernel, CPUAutoplug try to
shutdown some cores if the system load is low. If you want to disable
CPUAutoplug, you can add a kerenl parameter "autoplug=off".

As an alternative, you can disable CPUAutoplug at runtime:
echo 0 > /sys/devices/system/cpu/cpuautoplug/enabled
and then open the offline cores:
echo 1 > /sys/devices/system/cpu/cpu?/online
while "?" is the id of offline cores.

As another alternative, you can set the min CPU count of CPUAutoplug to 4:
echo 4 > /sys/devices/system/cpu/cpuautoplug/mincpus

Regards,
Huacai


On Thu, Dec 20, 2012 at 4:16 PM, s.boutayeb at free.fr <s.boutayeb at free.fr> wrote:
> Hi,
>
> I just ran a few tests [0] using Phoronix on this machine: Lemote laptop
> 8131 [1] with Loongson 3A CPU [2] [3]:
>
> The system logs are available in [4]:
>
> The laptop is running the stock LOonux3 [5] GNU/Linux distribution, based on
> Debian/Squeeze.
>
> The laptop was kindly donated by Lemote [6] for the GNewSense [7] porting
> project.
>
> Interessingly, the cpuinfo [8] shows 2 active processors, while the lscpu
> [9] info shows 4 processors, from which 2 are active and 2 inactive.
>
> [0] http://openbenchmarking.org/result/1212206-RA-LOONGSON875
> [1] http://www.lemote.com/products/computer/yilong/312.html
> [2] http://www.loongson.cn/product_info.php?id=31
> [3] http://www.loongson.cn/dev/wiki/%E9%BE%99%E8%8A%AF3A
> [4]
> http://openbenchmarking.org/system/1212206-RA-LOONGSON875/loongson-8131-loonux-smallpt
> [5] http://dev.lemote.com/category/loonux3
> [6] http://en.wikipedia.org/wiki/Lemote
> [7] http://www.gnewsense.org/Projects/GNewSenseToMIPS-3A
> [8]
> http://openbenchmarking.org/system/1212206-RA-LOONGSON875/loongson-8131-loonux-smallpt/cpuinfo
> [9]
> http://openbenchmarking.org/system/1212206-RA-LOONGSON875/loongson-8131-loonux-smallpt/lscpu
>
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