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Re: Changing the default 32-bit x86 arch for Fedora 12



On Wed, 2009-06-17 at 02:55 +0200, Kevin Kofler wrote:
> Bruno Wolff III wrote:
> > Is there going to be a way to tell which binaries actually use sse2
> > instructions, so that the others can be inherited by a secondary arch?
> 
> Due to how GCC works, if the compiler flags enable SSE/SSE2, basically all
> the binaries will be using some SSE/SSE2 instructions.

And on the various SSE-capable CPUs, how much benefit does that actually
give us?

I'm after a system-wide answer, not a microbenchmark for zlib or crypto
code. It should take into account any overheads involved in
saving/restoring registers on context switch that wouldn't otherwise
have to be saved/restored.

-- 
David Woodhouse                            Open Source Technology Centre
David Woodhouse intel com                              Intel Corporation


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