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系统性能不佳（ASRock X299 Taichi + Intel i7 7820-X）

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系统性能不佳（ASRock X299 Taichi + Intel i7 7820-X）

Ubuntu 16.04.1 LTS 内核 4.10.0-38-generic MB：ASRock X299 Taichi CPU：Intel i7-7820X，无超频

此示例应产生连续 10 秒的声音，但它断断续续了几次。

https://pastebin.com/3gptM47z

编译：

g++ pulsefail.cpp -std=c++11 -lpulse-simple -lpulse
./a.out

添加以下内核命令行选项后：

clocksource=hpet lapic=notscdeadline

示例按预期运行。并且整体系统性能和响应能力要好得多。

我还尝试使用 __rdtsc 指令测量此示​​例中的 TSC 频率。在添加内核选项之前，计算结果为 ~3,75 GHz，但应用解决方法后，结果变为 ~3,60 GHz。

更改内核选项后，‘dmesg | grep TSC’ 的显著结果：

[    0.000000] [Firmware Bug]: TSC ADJUST: CPU0: -2477218568993634 force to 0
[    0.183572] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU1: 0
[    0.184601] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU2: 0
[    0.185638] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU3: 0
[    0.186669] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU4: 0
[    0.187698] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU5: 0
[    0.188724] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU6: 0
[    0.189807] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU7: 0
[    0.190802] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU8: 0
[    0.191845] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU9: 0
[    0.192869] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU10: 0
[    0.193901] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU11: 0
[    0.194928] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU12: 0
[    0.195960] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU13: 0
[    0.196986] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU14: 0
[    0.198070] [Firmware Bug]: TSC ADJUST differs: Reference CPU0: -2477218568993634 CPU15: 0
[   16.499107] vboxdrv: TSC mode is Invariant, tentative frequency 3600020432 Hz

没有它们，除了改变时钟源外，就没什么了。没有错误或任何东西，但 TSC 频率计算接近 3,75 GHz。

答案1

更新：针对不正确的 TSC 频率问题的内核补丁已合并。使用此补丁构建内核可修复此问题。

https://patchwork.kernel.org/patch/10177619/ https://github.com/torvalds/linux/commit/b511203093489eb1829cb4de86e8214752205ac6#diff-96989d5a06fa45e5014d1613838a4f86

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