andi, I tried to lift apic id in LinuxBIOS for all cpus after 0x10. When using MB with AMD8111, the jiffies was not moving. So it is locked at calibrate_delay_direct... but MB with Nvidia ck804, jiffies is moving. If I don't change BSP apic id ( keep it to 0), It changes.... I have no idea how the jiffies changes, there is another thread change it....? YH Memory: 508000k/524288k available (3146k kernel code, 15900k reserved, 1160k data, 296k init) calibrate_delay_direct i=0 calibrate_delay_direct start_jiffies=fffedb08 calibrate_delay_direct 1 jiffies=fffedb08 calibrate_delay_direct 1 jiffies=fffedb08 calibrate_delay_direct 1 jiffies=fffedb08 calibrate_delay_direct 1 jiffies=fffedb08