Hi John:
It crankes up to 77,000PPS wow! but is it real or is the
display just totaly screwed up? Art I tried the apic version setting
in bios nothing happened. But if the computer is busy doing something
PPS seams to jump right up there?
This is a DMA problem. Mach2 counts the actual interrupts as they occur
and the pulse/second number tracks the interrupts that occur in "count" CPU
clocks. So on a 1Ghz machine, Mach2 counts how many interrupts occured in 1
billion counts of the CPU clocks. When a system performs a DMA cycle, the
clock on the CPU CAN be disabled as thge CPU is shutdown during DMA time.
This means if you get way too much DMA, Mach2 dutifully did all the
interrupts it could, then found that 75000 interrupts occured in 1 billion
CPU clocks. Probelm being that usually 1 billion clocks took 1 second, but
in your case, 1 billion clocks took 2 seconds ( or 3 ). Somethign is eating
DMA cycles like crazy, this is usually caused by on-board video or a disk
caching scheme gone nuts. Look for some reason that DMA would be high, this
is just about the only thing that can cause the pulse count to jump high up.
This is most common on laptops which keep DMA'ing for a drive or video
cache...
Good luck,
Art
www.artofcnc.ca
