[ELDK] Fwd: OpenJDK and Other Questions
wd at denx.de
Mon Sep 22 20:49:28 CEST 2008
in message <8f9e78f00809221051m77192e40u9655b3ecfec12c6c at mail.gmail.com> you wrote:
> I've been wondering about how large the performance penalty might
> be...and was already planning to pick up a 440-series board with a FPU
> soon in order to do some benchmarking.
I'm afraid it's impossible to tell without defining your very
specific application mix. And even then it depends a lot on what you
are doing, and how. The same algoithm implmented in one language or
another may make a huge dofference - for example, when Perl does all
internal data representation using floating point numbers.
> My initial hope was that we could avoid most floating-point operations
> in our developed code. Not sure however if there other places in the
> open source platforms I'm aiming to use - or the underlying VM where
> it would be impossible to avoid FP maths.
Normally it's not that critical for most real-world applications, but
as mentioned before - only your own application mix is relevant here.
> SSL/TLS and encryption operations will also likely be a problem. I
> don't know much about the Turbo Security Engine that ships with 440EPx
> but it seems like that might be a necessity provided it works properly
> with the operating system and VM.
Well, you need appropriate drivers to support the SE, and so far none
are available yet from mainline Linux. AMCC has just recently
(yesterday or today, I think) posted patches in that direction on the
crypto mailing list, but I have no information about quality or
> If anyone is interested please let me know and I'll be happy to share
> some of my findings, progress updates, etc.
Please do. This information may be interesting to many of us here on
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