The CMA (Contiguous Memory Allocator) is an intelligent continuous memory allocation technology and is an extension of the Linux Kernel memory management system. The purpose is to solve the problem of running out of memory due to the need to reserve a large amount of continuous memory for video playback (especially for 4K video).
At present, the market supports 4K ultra-high resolution resolution products, the general practice will reserve part of the memory out, this part of the reserved memory is usually not used, only used in the playback of 4K ultra high-definition video. However, this will also result in a reduction of normal function memory, which will affect fluency when large tasks are involved. The millet box 1G enhanced version uses optimized CMA intelligent continuous memory allocation technology, usually allocates large blocks of continuous memory reserved for 4K playback to other programs, fully guarantees the smoothness of the system, and is fast when playing 4K videos. Allocating memory to the video player also ensures smooth 4K playback.
to sum up:
The millet box 1G enhanced version uses the CMA memory allocation technology optimized by Xiaomi, making the memory usage of the millet box more efficient, improving the memory management strategy of the Linux kernel, doing well in the millet box product itself, and also developing the Linux technology. Made a great contribution.
The Schottky Diode is another type of semiconductor diode which can be used in a variety of wave shaping, switching and rectification applications the same as any other junction diode. The main adavantage is that the forward voltage drop of a Schottky Diode is substantially less than the 0.7 volts of the conventional silicon pn-junction diode.
Schottky diodes have many useful applications from rectification, signal conditioning and switching, through to TTL and CMOS logic gates due mainly to their low power and fast switching speeds.
the Schottky Diode also known as a Schottky Barrier Diode is a solid-state semiconductor diode in which a metal electrode and an n-type semiconductor form the diodes ms-junction giving it two major advantages over traditional pn-junction diodes, a faster switching speed, and a low forward bias voltage.
The metal–to-semiconductor or ms-junction provides a much lower knee voltage of typically 0.3 to 0.4 volts compared against a value of 0.6 to 0.9 volts seen in a standard silicon base pn-junction diode for the same value of forward current.
Variations in the metal and semiconductor materials used for their construction means that silicon carbide (SiC) Schottky diodes are able to turn [ON" with with a forward voltage drop as little as 0.2 volts with the Schottky diode replacing the less used germanium diode in many applications requiring a low knee voltage.
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