On 26/09/19 02:54, Wanpeng Li wrote: > -#define LAPIC_TIMER_ADVANCE_ADJUST_MIN 100 > -#define LAPIC_TIMER_ADVANCE_ADJUST_MAX 5000 > -#define LAPIC_TIMER_ADVANCE_ADJUST_INIT 1000 > +#define LAPIC_TIMER_ADVANCE_EXPIRE_MIN 100 > +#define LAPIC_TIMER_ADVANCE_EXPIRE_MAX 10000 > +#define LAPIC_TIMER_ADVANCE_NS_INIT 1000 > +#define LAPIC_TIMER_ADVANCE_NS_MAX 5000 I think the old #define value is good. What about: -#define LAPIC_TIMER_ADVANCE_ADJUST_MIN 100 -#define LAPIC_TIMER_ADVANCE_ADJUST_MAX 5000 -#define LAPIC_TIMER_ADVANCE_ADJUST_INIT 1000 +#define LAPIC_TIMER_ADVANCE_ADJUST_MIN 100 /* clock cycles */ +#define LAPIC_TIMER_ADVANCE_ADJUST_MAX 10000 /* clock cycles */ +#define LAPIC_TIMER_ADVANCE_NS_INIT 1000 +#define LAPIC_TIMER_ADVANCE_NS_MAX 5000 ? Thanks, Paolo