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Groups > comp.os.msdos.djgpp > #1729

Re: __dpmi_int() or int86() ?

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> From: "Rod Pemberton" <dont_use_email@xnohavenotit.cnm>
> Date: Sat, 15 Feb 2014 05:03:46 -0500
> 
> But, which is _actually_ faster with CWSDPMI for calling
> RM interrupts?  PMODEDJ?  Is it faster to use __dpmi_int()
> or to use int86()?  Has anyone actually timed this, in the
> past perhaps?  I.e., how does the combined overhead of each
> DJGPP call and DPMI portion compare for both?

I didn't time this, but I don't think the differences matter much.
Any way you do it, there's a need for two mode switches.  A mode
switch eats up thousands of CPU cycles, which is orders of magnitude
more than any overhead incurred by an extra function call.

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__dpmi_int() or int86() ? "Rod Pemberton" <dont_use_email@xnohavenotit.cnm> - 2014-02-15 05:03 -0500
  Re: __dpmi_int() or int86() ? Eli Zaretskii <eliz@gnu.org> - 2014-02-15 16:37 +0200

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