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en:c2_set_cpu_freq [2016/09/05 16:34] joy.cho [How to set the number of cpu cores] |
en:c2_set_cpu_freq [2016/09/08 15:31] joy.cho [How to set max cpu frequency and cores] |
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| Line 2: | Line 2: | ||
| <WRAP center round important> | <WRAP center round important> | ||
| - | * Ubuntu | + | * Ubuntu : Available with 3.14.77-80 (Sep 8, 2016) or higher version |
| - | * Android | + | * Android : Available with Android v2.2 or higher version |
| </WRAP> | </WRAP> | ||
| + | For further information, you can refer to the following forum thread. | ||
| + | |||
| + | http://forum.odroid.com/viewtopic.php?f=141&t=23044 | ||
| ===== How to set max cpu frequency ===== | ===== How to set max cpu frequency ===== | ||
| Line 12: | Line 15: | ||
| == The available list of cpu frequency set == | == The available list of cpu frequency set == | ||
| - | We recommend the following cpu frequency sets under normal conditions. | + | Here are the common sets we recommend under normal conditions. |
| | frequency | notation on boot.ini | | | frequency | notation on boot.ini | | ||
| Line 37: | Line 40: | ||
| == setting boot.ini == | == setting boot.ini == | ||
| - | Please modify **max_freq ** based on the aforementioned frequency table and be sure the unit is MHz. | + | Please modify **max_freq ** based on the aforementioned frequency table. The unit of max_freq in boot.ini is MHz. |
| + | |||
| + | If you don't set max_freq in bootargs or the setting value is wrong one which doesn't exist in frequency table, max_freq will be set as "1.536GHz" by default. | ||
| <code> | <code> | ||
| Line 60: | Line 65: | ||
| After setting it, then be sure you do reboot. | After setting it, then be sure you do reboot. | ||
| - | You can check the frequency list as following. (example : setenv max_freq "1656") | + | You can check the frequency list as following. |
| + | ex) setenv max_freq "1656" | ||
| <code> | <code> | ||
| root@odroid64:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies | root@odroid64:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies | ||
| Line 85: | Line 91: | ||
| # Boot Arguments | # Boot Arguments | ||
| - | # add maxcpus in bootargs | + | # add max_freq in bootargs |
| - | setenv bootargs "root=UUID=e139ce78-9841-40fe-8823-96a304a09859 rootwait ro ${condev} no_console_suspend max_freq=${max_freq} maxcpus=${maxcpus} hdmimode=${m} m_bpp=${m_bpp} vout=${vout} fsck.repair=yes net.ifnames=0 elevator=noop disablehpd=${hpd}" | + | setenv bootargs "root=UUID=e139ce78-9841-40fe-8823-96a304a09859 rootwait ro ${condev} no_console_suspend max_freq=${max_freq} maxcpus=${maxcpus} hdmimode=${m} ${comde} m_bpp=${m_bpp} vout=${vout} fsck.repair=yes net.ifnames=0 elevator=noop disablehpd=${hpd}" |
| </code> | </code> | ||
| + | After setting it, then please be sure you do reboot. | ||
| + | |||
| + | You can check the activated cpu cores as following. | ||
| + | |||
| + | ex) setenv maxcpus "2" | ||
| + | <code> | ||
| + | root@odroid64:~# cat /sys/devices/system/cpu/online | ||
| + | 0-1 | ||
| + | root@odroid64:~# cat /sys/devices/system/cpu/offline | ||
| + | 2-3 | ||
| + | </code> | ||
| + | |||
| + | <code> | ||
| + | root@odroid64:~# cat /proc/cpuinfo | ||
| + | processor : 0 | ||
| + | BogoMIPS : 2.00 | ||
| + | Features : fp asimd crc32 | ||
| + | CPU implementer : 0x41 | ||
| + | CPU architecture: 8 | ||
| + | CPU variant : 0x0 | ||
| + | CPU part : 0xd03 | ||
| + | CPU revision : 4 | ||
| + | |||
| + | processor : 1 | ||
| + | BogoMIPS : 2.00 | ||
| + | Features : fp asimd crc32 | ||
| + | CPU implementer : 0x41 | ||
| + | CPU architecture: 8 | ||
| + | CPU variant : 0x0 | ||
| + | CPU part : 0xd03 | ||
| + | CPU revision : 4 | ||
| + | |||
| + | Hardware : ODROID-C2 | ||
| + | </code> | ||
