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On Wednesday 18 July 2007 18:49:00 Alex Schuster wrote: |
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> > What I want to know is, will my software, compiled with the above |
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> > settings, run in the new processor? |
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> |
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> I think this will not work well, because your current system has |
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> Athlon-specific CPU instructions which the Intel machine dows not know |
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> of. You probably get "illegal instruction" errors with many binaries. I |
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> even had this when I replaced my athlon-something with a just slightly |
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> less powerful Sempron CPU. |
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Actually, I'd not be surprised if everything, or at worst a large percentage |
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of everything, works properly. |
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I make large use of binary packages on the production servers I run, and I |
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recently encountered something "interesting". |
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Everything was built CHOST=i686-pc-linux-gnu, CFLAGS=--march=opteron, |
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correctly on a dual Opteron. Those packages were then used to build an |
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install on a pair of old dual P4 Xeon boxes (not the current Core Xeons), and |
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everything worked fine (and continues to work fine). |
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It wasn't until I came to use those packages on a P3, where there were loads |
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of "illegal instructions", which very nearly forced me to drive 45 miles to |
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go fix it locally. |
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All of these are headless servers though, so naturally have no X or |
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any "desktop" software. However, you're going the opposite way, an "old" |
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instruction set, to a "new" one. |
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Basically, don't jump in to reinstalling, or rebuilding. Try it first, you |
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might be pleasently surprised. |
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-- |
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Mike Williams |
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-- |
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