On 2015-Jan-04 11:56:14 -0600, Bryan Venteicher <bry...@daemoninthecloset.org> wrote: >For the last few weeks, I've been working on adding support for KVM clock >in the projects/paravirt branch. Currently, a KVM VM guest will end up >selecting either the HPET or ACPI as the timecounter source. Unfortunately, >this is very costly since every timecounter fetch causes a VM exit. KVM >clock allows the guest to use the TSC instead; it is very similar to the >existing Xen timer.
A somewhat late response but have you looked at https://github.com/blitz/freebsd/commit/cdc5f872b3e48cc0dda031fc7d6bdedc65c3148f I've been running this[*] on a Google Compute Engine instance for about 6 months without problems. [*] I had to patch out the test for KVM_FEATURE_CLOCKSOURCE_STABLE_BIT but I think that's a GCE issue. -- Peter Jeremy
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