Peter C. Wallace wrote: > To check what was going on I toggled an I/O bit at the servo thread rate and > looked at it on the oscilloscope, and the latency on the servo thread is much > worse than 6 usec, occasionally getting above 100 usec! . It gets > noticable worse when the screen is re-drawn. I do not know why the latency > test does not "see" this. > It is likely large DMA transfers between the main memory and the frame buffer memory (which may actually be the same memory device) tying up the CPU. There may be graphics optimizations that can be turned off to avoid this.
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