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May 6, 2011 09:05 pm

Writing Linux Kernel Functions In CUDA With KGPU

An anonymous reader writes "Until today, GPGPU computing was a userspace privilege because of NVIDIA's closed-source policy and AMD's semi-open state. KGPU is a workaround to enable Linux kernel functionality written in CUDA. Instead of figuring out GPU specs via reverse-engineering, it simply uses a userspace helper to do CUDA-related work for kernelspace requesters. A demo in its current source repository is a modified eCryptfs, which is an encrypted filesystem used by Ubuntu and other distributions. With the accelerated performance of a GPU AES cipher in the Linux kernel, eCryptfs can get a 3x uncached read speedup and near 4x write speedup on an Intel X25-M 80G SSD. However, both the GPU cipher-based eCryptfs and the CPU cipher-based one are changed to use ECB cipher mode for parallelism. A CTR, counter mode, cipher may be much more secure, although the real vanilla eCryptfs uses CBC mode. Anyway, GPU vendors should think about opening their drivers and computing libraries, or at least providing a mechanism to make it easy to do GPU computing inside an OS kernel, given the fact that GPUs are so widely deployed and the potential future of heterogeneous operating systems."

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