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A kernel is at the heart of the Linux OS; and this kernel acts as an interface between the user and underlying hardware.
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exa(4) [bsd man page]

EXA(4)							     Kernel Interfaces Manual							    EXA(4)

NAME
exa - new 2D acceleration architecture for X.Org DESCRIPTION
EXA provides a simple API for video drivers to implement for 2D acceleration. It is a module loaded by drivers, and is not intended to be loaded on its own. See your driver's manual page for how to enable EXA. The EXA architecture is designed to make accelerating the Render extension simple and efficient, and results in various performance trade- offs compared to XAA. Some xorg.conf options are available for debugging performance issues or driver rendering problems. They are not intended for general use. Option "EXANoComposite" "boolean" Disables acceleration of the Composite operation, which is at the heart of the Render extension. Not related to the Composite extension. Default: No. Option "EXANoUploadToScreen" "boolean" Disables acceleration of uploading pixmap data to the framebuffer. Default: No. Option "EXANoDownloadFromScreen" "boolean" Disables acceleration of downloading of pixmap data from the framebuffer. NOTE: Not usable with drivers which rely on DownloadFrom- Screen succeeding. Default: No. Option "MigrationHeuristic" "anystr" Chooses an alternate pixmap migration heuristic, for debugging purposes. The default is intended to be the best performing one for general use, though others may help with specific use cases. Available options include "always", "greedy", and "smart". Default: always. SEE ALSO
Xorg(1), xorg.conf(5). AUTHORS
Authors include: Keith Packard, Eric Anholt, Zack Rusin, and Michel Danzer X Version 11 xorg-server 1.12.4 EXA(4)

Check Out this Related Man Page

EXA(4)							     Kernel Interfaces Manual							    EXA(4)

NAME
exa - new 2D acceleration architecture for X.Org DESCRIPTION
EXA provides a simple API for video drivers to implement for 2D acceleration. It is a module loaded by drivers, and is not intended to be loaded on its own. See your driver's manual page for how to enable EXA. The EXA architecture is designed to make accelerating the Render extension simple and efficient, and results in various performance trade- offs compared to XAA. Some xorg.conf options are available for debugging performance issues or driver rendering problems. They are not intended for general use. Option "EXANoComposite" "boolean" Disables acceleration of the Composite operation, which is at the heart of the Render extension. Not related to the Composite extension. Default: No. Option "EXANoUploadToScreen" "boolean" Disables acceleration of uploading pixmap data to the framebuffer. Default: No. Option "EXANoDownloadFromScreen" "boolean" Disables acceleration of downloading of pixmap data from the framebuffer. NOTE: Not usable with drivers which rely on DownloadFrom- Screen succeeding. Default: No. Option "MigrationHeuristic" "anystr" Chooses an alternate pixmap migration heuristic, for debugging purposes. The default is intended to be the best performing one for general use, though others may help with specific use cases. Available options include "always", "greedy", and "smart". Default: always. SEE ALSO
Xorg(1), xorg.conf(5). AUTHORS
Authors include: Keith Packard, Eric Anholt, Zack Rusin, and Michel Danzer X Version 11 xorg-server 1.8.0 EXA(4)

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