Regression caused by "drm/radeon: Don't increment pipe_id in kgd_init_pipeline"

[Michel Dänzer]

On 16.02.2015 20:27, Oded Gabbay wrote:
> 
> 
> 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.

Sounds good, thanks!


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer