Im using a Tesla K20c and the performance in Linux (Ubuntu) is always about 2X to 5X faster than Windows 7 for the exact same kernel code. I’m timing just basic math functions and reading/writing GPU global memory, atomic add, etc, using sm_35, coalesced memory calls, etc etc. . Since the testing is on the same machine, just booting into different OS’s, not sure what the issue is. Using Visual Studio 2012 on windows 7. Have the latest drivers loaded for each OS, would have thought there may be some differences in speed but not this much. Tried another machine using the same kernels that had a TITAN in it with the exact same results, being Windows 7 was always slower by 2x to 5X than Ubuntu.
Is this normal ?