Development version of kvmclock FreeBSD driver for virtual machines.
- RedHat: Virtualization Deployment and Administration Guide -- Chapter 8. KVM Guest Timing Management
- VMWare: Timekeeping in VMware Virtual Machines (Information Guide, PDF)
- Pitfalls of TSC usage -- 3.3 TSC emulation on different hypervisors (2015-09-09, Oliver Yang)
- FreeBSD Review D29531: Add kvmclock timecounter support to FreeBSD
- FreeBSD Bug #216759: Memory speed with small blocks (1K) up to 35 times slower than host system (under QEMU)