Hi all, Currently, DRM drivers implementing dumb-buffers apply alignment to the requested width, passing the resulting pitch back to user-space. The specifics of the alignment can be various - from CPU/GPU architecture or bus/interconnect, to no alignment at all. By using dumb-buffers the CPU reads/writes the data itself - a somewhat slow task. To maximise performance, user-space may opt for CPU specific optimisations, be that use SIMD, align data to cache lines or otherwise. So even when user-space requests width they can optimally use, the DRM driver is free to effectively invalidate it. This RFC proposes user space alignment to the dumb-buffer ioctl. Hence the resulting pitch returned by the DRM driver will be subject to both user space and HW/DRM specific requirements. What do you guys think? Regards, Emil _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
