Linux DRM Scheduler Selftest

Linux DRM sched_test Driver

sched_test is a simple DRM driver which exposes a RENDER interface with ioctls to submit (DRM_IOCTL_SCHED_TEST_SUBMIT) a dummy task and wait (DRM_IOCTL_SCHED_TEST_WAIT) for the completion of the sumitted dummy task. The driver uses a dedicated kernel thread to emulate a real HW queue. The DRM scheduler instantiated by this driver submits jobs to this emulated HW queue and waits for completion notification from the emulated HW thread. The emulated HW thread treats the sumitted dummy task as a NOP and tries to immediately complete the task by notifying the scheduler of completion.

Building the driver

cd drm_sched_test
make

Test Applications

There are currently two tests: test1 and test2

Building the Test Applications

cd drm_sched_test/test
make

Running the Test Applications

cd drm_sched_test
make run

Benchmarking the Scheduler

The tests print throughput numbers as IOPS. Run the tests with large iteration loops like this

cd drm_sched_test
make
./test1 -c 1000000
./test2 -c 1000000