How does persistent mapped buffers work in OpenGL?

问题

In OpenGL 4.4 there was a nice extension added: ARB_buffer_storage

How does persistent buffers work (or might work) - using MAP_COHERENT_BIT and MAP_PERSISTENT_BIT set ?

• Is there some special intermediate buffer?
• Why it can be usually faster than normal mapped buffers?

来源：https://stackoverflow.com/questions/27777368/how-does-persistent-mapped-buffers-work-in-opengl