Almost whole my question is in subject. Question is simple and straight forward.
Why reference frequency might be significantly lower ( ~13% ) than thread frequency on CPU with SKU without Turbo.
Package CPU_CLK_UNHALTED.REF_TSC CPU_CLK_UNHALTED.THREAD
package_0 350,845,000,000 398,688,400,000
CPU: Intel(R) Xeon(R) CPU E5-2407 0 @ 2.20GHz.
SMT (Hyper-threading) is disabled
My ideas are limited to two cases, either something wrong with VTune or PMU. Are there any other possibilities?