On a Kaveri (FX-7500) laptop I experienced a problematic performance degradation. While OpenCL benchmarks with previous driver exhibited over 400 GFlops with the new driver I only had ~150 GFlops. Thus I had to revert to the previous driver. Can anybody else with Kaveri laptop confirm this problem?
...and just to provide some additional information: I'm using Ubuntu 14.04 64bit Linux (kernel 3.19, OpenCL driver 1729.3 (VM) ).
I also tried the new driver on a desktop system with R7-260X (same OS) and everything was fine!
I have just finished running some quick performance evaluations on 15.7 using my project (the code isn't public yet, but it'll hopefully be by the end of next week).
I don't have a consistent testing methodology for previous runs. This time I can monitor visually the measured performance.
Trusting my gut feelings, I'd say the performance has degraded slightly. In terms of peak performance the difference can be up to 10% but I'm recalling from memory.
BUT what I can tell for sure is this driver produces less variability. It is very steady; I like it. In terms of averages the difference is likely less marked.
Besides, with my card approaching 70C I suspect some throttling might be going on. I will test more next week.