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| Overclocking in Linux |
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Overclocking
CPU
TODO I have not yet checked for system-tools for overclocking
GPU
AMD
CoreCtrl allows the manipulation of GPU frequency, voltages, power and the fancurve.
TODO installation hints
RAM
I'm unaware of any platform supporting online-editing of RAM timings
Monitoring
Sensors
The lm_sensors package shows temperatures, fan pwm and other sensors for your CPU, GPU and motherboard.
Run $ sensors to get the output.
Support for motherboard ITE LPC chips
Support for this type of chip does not come built in to lm_sensors.
In the AUR the package it87-dkms-git provides a kernel module with support for a variety of ITE chips. It pulls from this git repo. You can find a list of supported chips there. See this issue on lm_sensors git repo for background info.
The kernel driver can be automatically loaded on boot by putting it87 into /etc/modules-load.d/(filename).conf
The option acpi_enforce_resources=lax also needs to be added to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub or your bootloader equivalent.
CoreFreq
CoreFreq can display a lot of information about the CPU and the memory controller.
To run, the systemd service corefreqd needs to be enabled.
CoreFreq also depends on a kernel driver. Simply put corefreqk into /etc/modules-load.d/(filename).conf to load it automatically on boot.
Access the TUI using $ corefreq-cli
A few interesting views:
Shift + C shows per thread frequency, voltage and power, as well as overall power and temperature.
Shift + M shows the memory timings, frequency and DIMM layout.
CoreCtrl
CoreCtrl displays a range of information for AMD GPUs.
Error monitoring
Some applications have hardware error reporting built-in.
Kernel log
For others, try checking the kernel log.
$ journalctl -k --grep=mce
Rasdaemon
You can also install aur/rasdaemon and enable its two services.
# systemctl enable --now ras-mc-ctl.service
# systemctl enable --now rasdaemon.service
$ ras-mc-ctl --summary shows all historic errors
$ ras-mc-ctl --error-count shows memory errors of the current session
Testing
CPU
Prime95/Mprime
$ mprime
Select "No" when asked to join the distributed computing project
16 for torture testing
Recommended test: 2
This application includes hardware error checking. Output to the CLI as well as the logfile.
Check the file results.txt
ffmpeg video encoding
This command encodes random noise with x265 and discards the resulting video
$ ffmpeg -y -f rawvideo -video_size 1920x1080 -pixel_format yuv420p -framerate 60 -i /dev/urandom -c:v libx265 -preset placebo -f matroska /dev/null
Stress
Stress is capable of testing CPU, memory, I/O and disks
Use $ stress -c (threads) to test the CPU
GPU
TODO
RAM
Stressapptest
NOTE: Produces heavy load on the CPU as well. A stable CPU OC before running this is recommended.
$ stressapptest -M (RAM MiB) -s (time in s) -m (CPU threads)