------- Comment #22 from ubizjak at gmail dot com 2009-11-10 07:45 ------- (In reply to comment #20) > Yes K6 is the best fallback for geode-lx, while pentium-mmx is the best one > for > geode.
BTW, recommended fallback is K6-2. > I need to know if this new -march argument will be added so I edit the kernel > patch. Actually, according to gcc documentation, "-march=geode" is intended specifically for geode-lx and switches on features and tuning options for geode-lx. If you want to play with tuning options, you can check differences between m_PPRO and m_GEODE in i386.c, ix86_tune_features. By changing these settings, you can narrow down which flag causes a regression. I would suggest to start with flags that mention partial register stalls. OTOH, you can also play with "-march=geode, -mtune=i686" to switch on various tuning flags. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41989
