IA32_PERF_TURBO_DIS
if (perf_ctl & IA32_PERF_TURBO_DIS) {
perf_ctl &= ~IA32_PERF_TURBO_DIS;
if (!(perf_ctl & IA32_PERF_TURBO_DIS)) {
perf_ctl |= IA32_PERF_TURBO_DIS;