On 02/13/2015 12:01 PM, Michel Dänzer wrote: > > Hi Oded, > > > the commit in the subject (5a8888a3119eb5b67f6e90605be9ed2e04807126) > somehow causes degraded CPU (!) performance on my Kaveri box. E.g. a > piglit run takes about 15% longer, and I suspect the same is true for > e.g. compiling the kernel, though I haven't measured that explicitly. > > In addition to the measurably worse performance, the commit causes the > CPU fan to stay significantly quieter during CPU-bound tasks, so maybe > the commit somehow causes the CPU not to achieve turbo clocks or > something like that. > > I'm attaching my .config. I don't see any difference in dmesg with or > without the commit. > > Hi Michel, Thanks for catching that. As we talked on IRC, there is indeed a bug in amdkfd. I will publish the fix you tested to be included in 3.20 and mark it as stable. I will also add piglit to my regression tests.
Oded