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In the 2.6.35 kernel I have a choice of:

  1. Operon/Athlon64/Hammer/K8
  2. Generic-x86-64

The first option seems best but I'd like confirmation. I have no idea whether there is a specific -mcpu / -march flag for this processor. Are there any other tricks to optimise software for this processor.

I run Gentoo if that makes any difference.

UPDATE: I have found answer 2 from AMD themselves: http://www.amddevcentral.com/CPU/GNU/Pages/default.aspx

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can you use -march=native here? –  rogerdpack Sep 27 '13 at 22:47
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up vote 0 down vote accepted

I use CFLAGS="-march=amdfam10 -O2 -pipe" (amd64,gentoo-source 2.6.34-r6,gcc 4.4.3-r2). Everything is stable and safe.

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Ever tried -03 ? It's listed in the AMD GCC Quick Reference as "Aggresive Optimisation" so I'm kinda tempted. –  SpliFF Sep 29 '10 at 10:50
    
No(simple about -O3 and optimize gcc linuxjournal.com/article/7269). I try clang, but i have many problem. –  bindbn Sep 29 '10 at 12:40
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