intel_upload_blit_large_gtt man page
intel_upload_blit_large_gtt — microbenchmark of Intel GPU performance
intel_upload_blit_large_gtt is a microbenchmark tool for DRM performance. It should be run with kernel modesetting enabled, and may require root privilege for correct operation. It does not require X to be running.
Given that it is a microbenchmark, its utility is largely for regression testing of the kernel, and not for general conclusions on graphics performance.