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Using Multiple CPU Cores in DOS? (Miscellaneous)

posted by RayeR(R) Homepage, CZ, 15.09.2011, 01:15

> What I do is measure how long it takes to do a small INT 15.87 memory
> transfer. The only parts that should be involved in an INT 15.87 transfer
> outside of the pair of time-consuming mode switches are some
> initialization, a REP MOVSx, and some clean-up, which are all minimal in
> time consumption.

But you don't know how BIOS implements this service. If BIOS writer make it crappy then you got bad result and it may differ from pure time needed for mode switch. Maybe I would get better result if I install a dummy RM ISR (just IRET) for some unused INT vector and then call it via __dpmi_int(myINT, &regs); and measure the time. But it will also counts DPMI server overhead...

DOS gives me freedom to unlimited HW access.


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