Hello list! My company has 2 HP DL585 G5 servers and 5 Dell R... something servers. All using AMD processors. They currently are acting as XenServer hosts.
How do I determine the 'least common denominator' for Gentoo VMs (running as XenServer guests), especially for gcc flags? I know that the (theoretical) best performance is to use -march=native , but since the processors of the HP servers are not exactly the same as the Dell's, I'm concerned that compiling with -march=native will render the VMs unable to migrate between the different hosts. Note: Yes I know the HP servers are much older than the Dell ones, but if I go -march=native then perform an emerge when the guest is on the Dell host, the guest VM might not be able to migrate to the older HPs. Rgds, --
