Comment # 7 on bug 98386 from Ilia Mirkin

(In reply to Bob Bugzilla from comment #6)
> Benchmark test: "export vblank_mode=0; glxgears"
> 
> Normally get 12,000 FPS.
> 
> With this bug, 1,000 FPS.

With PRIME, that's a benchmark of PCIe bandwidth. Probably stuck at 2.5 GT/s if
you didn't reclock.