I hope I am not transgressing rules of the group, but some MVME166-11A
68040 processors have been sighted at $500/each, NEW IN THE MOTOROLA BOXES
DOM is '97-98 !
Anyone who is interested, please send me a note, and I will put the deal
together.
Sincerely,
Ed Monberg, General Manager
LMDC
3101 Whipple Road, Union City, CA 94587
510-429-1060, Fax 429-1065, Cell 510-427-0115
WEB CATALOGUE: http://www.lasermotion.com
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>I've been testing interrupt latencies with RTLinux-3 on the 200MHz Pentium
>machine. I have an external logic that sends an interrupt to the PC and
>latches a veto which blocks further interrupts. The PC outputs a pulse
>which clears the veto thus allowing further interrupts. I measure, on a
>scope, the time difference between the input signal and the output signal
>thereby giving me an pretty decent view of what the latency looks like.
>
>I have the following numbers:
>
>Case 1: the IRQ handler sends the output pulse - 6us.
>Case 2: the IRQ handler dispatches a rt thread which sends the output pulse
> - 10us.
>
>Case 3: the IRQ handler stuffs an RT fifo with an int; a user space process
>does a blocking read on the fifo and sends the output pulse - 40us
>(sometimes 50).
>
>
>In the case of #3, I'm wondering if a faster processor would do any better.
>Does anyone know? I'm debating whether to do my task as a rt thread or as a
>user space process. My task would take up to 1ms to complete. Obviously,
>the rt task is faster, but would lack user space fault protection. If it is
>possible to bring #3 down to about 10us with a faster processor, then it may
>be worth it.
>
>Thanks! Ken
>
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