我正在使用Debian 8 amd64機器進行基準測試.在實驗過程中,我希望CPU以固定頻率(最好是可能的最大頻率)運行.這將排除CPU時鐘速度作為結果變化的來源.

The CPUfreq governor “performance” sets the CPU statically to the

highest frequency within the borders of scaling_min_freq and

scaling_max_freq.

遺憾的是,未提供有關scaling_min_freq和scaling_max_freq的更多詳細信息.希望它無關緊要,因為使用的CPU頻率是間隔的最大值.

所以我使用cpufreq-set啟用了這個調控器：

$cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

performance

performance

performance

performance

為了更好的衡量,我還在BIOS中禁用了turbo boost模式：

$cat /sys/devices/system/cpu/intel_pstate/no_turbo

1

基于以上對性能調控器的描述,我預計CPU時鐘速度不會有波動.然而,如果我反復運行cpufreq-info,我會看到時鐘速度波動：

$cpufreq-info | grep 'current CPU fr'

current CPU frequency is 4.00 GHz.

current CPU frequency is 3.99 GHz.

current CPU frequency is 4.00 GHz.

current CPU frequency is 4.00 GHz.

$cpufreq-info | grep 'current CPU fr'

current CPU frequency is 4.00 GHz.

current CPU frequency is 4.00 GHz.

current CPU frequency is 4.00 GHz.

current CPU frequency is 3.96 GHz.

$cpufreq-info | grep 'current CPU fr'

current CPU frequency is 4.00 GHz.

current CPU frequency is 4.00 GHz.

current CPU frequency is 4.00 GHz.

current CPU frequency is 3.94 GHz.

$cpufreq-info | grep 'current CPU fr'

current CPU frequency is 4.01 GHz.

current CPU frequency is 4.00 GHz.

current CPU frequency is 4.00 GHz.

current CPU frequency is 3.98 GHz.

這種波動是由于硬件,BIOS,內核還是其他因素造成的？有沒有辦法設置CPU頻率,使其根本不會波動？

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