1

So I am using my GPU (Nvidia GeForce GTX 850M) for scientific calculations.

After a while I realized that my calculations are far too slow.

I investigated and found a huge performance drop after suspending Ubuntu.

Here is an example with glxgears Benchmark:

  1. Startup Ubuntu
  2. run glxgears with result ~15000 FPS
  3. cancel glxgears and suspend
  4. login
  5. run glxgears with result ~200 FPS

This is consistent with my scientific calculations, where performence drops to ~1/30th after suspend. (The drop is smaller because not all calculations are done on GPU)

I tested this with and nvidia-361 and nvidia-370 drivers and can't figure out why this happens.

2

Found the following bug report about the same problem: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1559576

So it is an unsolved bug...

Will update if I find anything in case someone has the same problem.

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