TSC Clocksource calibration in kernel3.1.4

Hi I was running the kernel 2.6.32 and 3.1.4... In kernel3.1.4, I could see additional messages below after the rootfs was getting loaded.. Refined TSC Clocksource calibration: 3214.622 MHz Switching to clocksource tsc.. My understanding was that kernel gets loaded completely before rootfs starts getting loaded.. The above messages were not getting printed in kernel 2.6.32.. Any thoughts on this? Regards Rajaneesh