Hi,
I have upgraded my PC to newest chipset and CPU: Kaby Lake, Z270 with i7-7700K.
Out of curiosity I did a kernel benchmark. Comparing darktable performance with
kernel 3.16.0-4-amd64 and 4.9.0-1-amd64. I use the following command to run
darktable:
darktable-cli test.CR2 test.jpg --core -d perf -d opencl
The results are surprising for me. Kernel 4.9 very much outperformance kernel
3.16. Here are the results with and without opencl (using a Geforce GTX750TI):
kernel 3.16 kernel 4.9
with opencl 16 s 9 s
without opencl 120 s 23 s
Without opencl, that is with pure CPU performance, the difference is a factor
of 5!
Why is that? What am I missing? I can hardly believe that kernel 4.9 is so much
faster.
Matthias
PS
I have also posted this message to debian.user and I know that it is probably
better placed into a kernel developer list. But may be some DT expert knows the
answer or can eventually verify my results.
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