At 05:33 PM 3/18/2005 -0700, Schumacher, Gordon wrote:
Well, one thing that comes to mind is that (at least) Microsoft's EMM386 affects how the DPMI host allocates memory - I don't know if the same will be true of FreeDOS's, but we found some issues where it did definitely negatively impact the performance of DJGPP-compiled apps (of which RHIDE is one of, of course).
Certainly true that VCPI provides discrete allocations in 4K units even with a DPMI wrapper, versus XMS's maximum allocation of the biggest block available, up into multi-megabytes. DPMI allows huge memory allocations, too, but it has to request them through VCPI unless there is a native DPMI server loaded.
Theoretically that would result in a large performance delta should you have an application which is constantly allocating and deallocating small pieces of memory directly via the VCPI interface or DPMI wrapper without any internal memory management. An application or driver probably shouldn't act that way, but it's likely <unknown> percent of DOS extended programs do exactly that.
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