Ingo Molnar (
Wed, 12 Feb 1997 19:35:49 +0100 (MET)

> One binary code executes under MSDOS 17% faster(!) than
> under Linux. Why? How to get this loss back? I was dazed&confused.

one thing: it uses ALOT of floating point. And you say this happens:

[irqs off]

<ALOT of computing, only from memory, into memory, using CPU and FPU>

[irqs on]

and delta := timestamp2-timestamp1, and you say delta(DOS) is 17% better
than delta(Linux) ?

all code has the same alignment? And it's only this code that is
executing? And you say TLB cache isnt trashing?

Impossible!! ;) unless there is some memory chipset / CPU cache / FPU
setup trick done by DOS/Win/Win95.

-- mingo