Messages in this thread | | | Date | Wed, 12 Feb 1997 19:35:49 +0100 (MET) | From | Ingo Molnar <> | Subject | Re: CONUNDRUM. |
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> 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] [timestamp1]
<ALOT of computing, only from memory, into memory, using CPU and FPU>
[timestamp2] [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
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