I may have to withdraw what I said earlier about stability on high performance.
I had fixed it to high to launch a piglit run, after doing the same thing at
low performance, and it eventually hanged. Now, was it related to a dpm problem
or to a piglit hitting a bug (see bug 71859), I can't tell right now? They may
even be related.

I was trying to confirm that I have different results when doing a piglit run
while using high performance VS low performance.

I'll give some updates later.