* Da Shi Cao: > The cpu_khz and tsc_khz are now read directly by the cpuid > instruction, and they are deemed to be very accurate. But this is not > the case in our situation. The OS time lags behind about 8 seconds per > hour. The CPU information is as follows: Is virtualization involved? Do you use a vendor kernel? Note that <linux-x86_64@xxxxxxxxxxxxxxx> is more or less dead, and your message to linux-kernel might get lost in the flood.