Hi again,

On Mon, Mar 25, 2013 at 5:03 PM, Rugxulo <rugx...@gmail.com> wrote:
> On Mon, Mar 25, 2013 at 4:07 PM, Eric Auer <e.a...@jpberlin.de> wrote:
>> However, speed is often worse if you have
>> a mismatch. But even if your 8 core 4 GHz AMD
>> (to make an example) 64 bit processor would be
>> able to simulate only 1 GHz, 1 core, Pentium III
>> it would still run DOS software which once ran
>> on 386 processors extremely fast. Or in a more
>> realistic setting, any half-decent processor can
>> simulate a DOS PC at 386 speeds today.
> You're somewhat correct, but often speed is abysmal. My laptop lacks
> VT-X and is painfully slow (e.g. Dillo), but my main desktop works
> great (Core i5).
> I really should benchmark for you to show you what it can be (but I'm
> barely in the middle of something right now, barely ...). I'm not
> really a hardware nut nor trendy enough to keep track, but ....

Lately I've been trying to (finally) officially test and compile P5
Pascal (pcom, pint) for FreeDOS. Compiling pcom + pint via GPC and
running the simplest six tests altogether takes approx. 50 seconds in
native DOS on this Core i5 (Nehalem Westmere 32nm).

Running that under VBox 4.2.6 atop Win7 64-bit SP1 (with VT-X and
Nested Paging enabled), it takes about 1 min. 50 secs.

If I turn off VT-X entirely in VBox, it then takes a lot longer.
(Still waiting ... okay, apparently it takes 8 min. 37 secs!) I don't
guess I should try the other tests (15 mins. and 4 hrs, respectively,
on native hardware!!)

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