[debian-yeeloong-project] [loongson-dev] System logs for Loongson 3A machine
chenhc at lemote.com
Thu Dec 20 12:46:20 UTC 2012
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
On Thu, Dec 20, 2012 at 4:16 PM, s.boutayeb at free.fr <s.boutayeb at free.fr> wrote:
> I just ran a few tests  using Phoronix on this machine: Lemote laptop
> 8131  with Loongson 3A CPU  :
> The system logs are available in :
> The laptop is running the stock LOonux3  GNU/Linux distribution, based on
> The laptop was kindly donated by Lemote  for the GNewSense  porting
> Interessingly, the cpuinfo  shows 2 active processors, while the lscpu
>  info shows 4 processors, from which 2 are active and 2 inactive.
>  http://openbenchmarking.org/result/1212206-RA-LOONGSON875
>  http://www.lemote.com/products/computer/yilong/312.html
>  http://www.loongson.cn/product_info.php?id=31
>  http://www.loongson.cn/dev/wiki/%E9%BE%99%E8%8A%AF3A
>  http://dev.lemote.com/category/loonux3
>  http://en.wikipedia.org/wiki/Lemote
>  http://www.gnewsense.org/Projects/GNewSenseToMIPS-3A
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