> You say the application runs, right? So what made you check the SPE > bit state? The kernel keeps SPE disabled by default so it doesn't > have to save the upper 32 bits of the registers every context > switch. When a process uses SPE for the first time, an exception is > triggered, the kernel enables SPE for that process, and then that > process should be able to use SPE every time it gets cpu time. > > How are you determining that the SPE bit is not set? Is your > application not executing the SPE instructions? > > Andy
Yes the application runs. I wrote a mini driver with an ioctl which performs a mfmsr() call and returns the value to the user application. I called this ioctl at several times before and after executing SPE code. I already tried to manually force the SPE bit with another ioctl which performs a enable_kernel_spe() call. The bit SPE is right set at this time but disappears later. I don't know if using ioctls is a right way to check the bit. Any idea ? Thanks G?rard
