Overallocation of the fbdev buffer

configname: CONFIG_DRM_FBDEV_OVERALLOC

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Overallocation of the fbdev buffer
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Defines the fbdev buffer overallocation in percent. Default
is 100. Typical values for double buffering will be 200,
triple buffering 300.