ntpd
NTP issues
- ntp.org: Known Hardware Issues
APIC, ACPI, Variable Speed Processors could cause problems to NTP - ntp.org: NTP Known Operating System Issues
- ntp.org: Troubleshooting NTP
- ntpd (4.2.2p1) stays “synchronized to LOCAL" – NTP
- Novell: Time Not Syncing With Remote NTP Server
- NTP Debugging Techniques
- Fix NTP problem by reduce kernel HZ value (unconfirmed)
- General NTP HOWTO
- 鳥哥的 Linux 私房菜: NTP server
- Bug 165826 – NTP cannot keep clock in sync on HP DL385-type systems
- Tuning NTP
This guy said to use HPET timer - VMware: Timekeeping best practices for Linux guests