Kernel dla Samsung NP535C3U [v20140214]

Obecnie kombinuję nad opracowaniem jądra dla systemu (Mint KDE 16) przygotowanego pod Samsunga NP535C3U. Jest to model z procesorem+GPU od AMD, bez napędu itd., itd. Stockowe jądro jest zbyt stockowe, zaś np. to od NeteXt'a nastawione na maszyny typu desktop (bez jakiejkolwiek oszczędności baterii).

W wersji 0.1 'mojej' wersji skorzystałem z konfiguracji NeteXt'a modyfikując tylko odrobinę konfigurację w celu zmniejszenia zużycia energii:

Processor type and features --> Preemption model --> Voluntary kernel

This option reduces the latency of the kernel by adding more "explicit preemption points" to the kernel code. These new preemption points have been selected to reduce the maximum latency of rescheduling, providing faster application reactions, at the cost of slightly lower throughput. 

This allows reaction to interactive events by allowing a low priority process to voluntarily preempt itself even if it is in kernel mode executing a system call. This allows applications to run more 'smoothly' even when the system is under load.

 --> Timer frequency --> 100 Hz

100 Hz is a typical choice for servers, SMP and NUMA systems with lots of processors that may show reduced performance if too many timer interrupts are occurring.

jako przeciwieństwo:

1000Hz: 1000 Hz is the preferred choice for desktop systems and other systems requiring fast interactive responses to events.

Power management and ACPI options --> CPU Frequency scaling --> Default CPUFreq governor --> powersave

Use the CPUFreq governor 'powersave' as default. This sets the frequency statically to the lowest frequency supported by the CPU.