BSD11 vs BSD12 KVM performance

Anish akgupt3 at
Sun May 5 00:54:53 UTC 2019

Hi Udayan,

Intel VM-x and AMD SVM allow hypervisor to intercept TSC access for
save/restore of VM migration, so when these intercepts are enabled, rdtsc
will require switch between root and non-root mode which is expensive and
may cost few hundreds of cpu cycles. Is it possible that one has these
intercepts always enabled even when migration is not started?


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