On 07/26/2011 12:22 PM, pk wrote:

On 2011-07-26 22:36, Alokat wrote:

model name      : Intel(R) Core(TM)2 Duo CPU     L7100  @ 1.20GHz

<snip>

I guess *core2* is the right one?

Yes, acc. to:
http://en.gentoo-wiki.com/wiki/Safe_Cflags/Intel#Core_2_Duo.2FQuad.2C_Xeon_51xx.2F53xx.2F54xx.2F3360.2C_Pentium_Dual-Core_T23xx.2B.2FExxxx.2C_Celeron_Dual-Core

HTH

Best regards

Peter K

Another good trick I've found on the forums is to run:

$ gcc -### -e -v -march=native /usr/include/stdlib.h

The last line of output will include the various CFLAGS that -march=native picks.  In my case (Phenom II 955):

 "/usr/libexec/gcc/x86_64-pc-linux-gnu/4.4.5/cc1" "-quiet" "/usr/include/stdlib.h" "-D_FORTIFY_SOURCE=2" "-march=amdfam10" "-mcx16" "-msahf" "-mpopcnt" "--param" "l1-cache-size=64" "--param" "l1-cache-line-size=64" "--param" "l2-cache-size=512" "-mtune=amdfam10" "-quiet" "-dumpbase" "stdlib.h" "-auxbase" "stdlib" "-o" "/tmp/ccR1PlNZ.s" "--output-pch=/usr/include/stdlib.h.gch"

I typically use -march=native when I don't need to worry about distcc, or the options from that output that start with "-m".

-Andy