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Using Multiple CPU Cores in DOS? (Miscellaneous)

posted by bretjohn(R) Homepage E-mail, Rio Rancho, NM, 15.09.2011, 19:11

> 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...

You can go ahead do such a test -- just make sure you're comparing apples to apples.

Even if the BIOS writer did a crappy implementation, it still wouldn't take 25 or 50 times as long as it needs to. Even a REALLY bad implementation would only be double, and in reality probably even far less than that.

The problem we need to resolve is not just a few percent, either. It's very significant -- I think we need a multiplier of at least 10 even from V86 mode.

 

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