Comment 442 for bug 1690085

I would like just to pass some evidence that this affects Threadrippers. I have two identical system with the 1950X on a Asus X399-A Prime motherboard. This motherboard does not have the Power Supply option in the BIOS. Both freeze from time to time.

But more interesting, both systems freeze when running a code developed by one of our students that uses Matlab and computes the SVD of a large matrix followed by some time almost idle writing to a NFS mount many times in a loop. The code takes around an hour to run. I made a small script loops between running the code followed by calling sleep for one extra hour to put the machine in a idle state. It always make the machines freeze in less than one day. In some cases the freeze happens even while the code is running, not only when idle. This seems odd. It is very reproducible.

The solution is to disable C6 fully using zenstates.py. Only disabling c6-packaging is not enough. Another possibility, that I am inclined is to recover some of the performance I lost by loosing turbo boost and XFR, is a light overclock. I am testing one of the machines now @3.75GHz.

Have anyone seen the "power supply" option in a X399 motherboard?