就在昨天，我使用软件更新程序安装了最新的内核更新。现在运行 flightgear 会降低整个系统的性能。返回到之前的内核 5.3.0-45 后，问题消失。更新后，我最终得到了
Linux HP 5.3.0-46-generic #38~18.04.1-Ubuntu SMP Tue Mar 31 04:17:56 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
命令
cat /var/log/dpkg.log
结果是
2020-04-06 21:08:43 startup archives unpack
2020-04-06 21:08:44 install linux-modules-5.3.0-46-generic:amd64 <none> 5.3.0-46.38~18.04.1
2020-04-06 21:08:44 status half-installed linux-modules-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:45 status unpacked linux-modules-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:45 status unpacked linux-modules-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:45 install linux-image-5.3.0-46-generic:amd64 <none> 5.3.0-46.38~18.04.1
2020-04-06 21:08:45 status half-installed linux-image-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:46 status unpacked linux-image-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:46 status unpacked linux-image-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:46 install linux-modules-extra-5.3.0-46-generic:amd64 <none> 5.3.0-46.38~18.04.1
2020-04-06 21:08:46 status half-installed linux-modules-extra-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:49 status unpacked linux-modules-extra-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:49 status unpacked linux-modules-extra-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:49 upgrade linux-generic-hwe-18.04:amd64 5.3.0.45.101 5.3.0.46.102
2020-04-06 21:08:49 status half-configured linux-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:49 status unpacked linux-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:49 status half-installed linux-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:49 status half-installed linux-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:49 status unpacked linux-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:08:49 status unpacked linux-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:08:49 upgrade linux-image-generic-hwe-18.04:amd64 5.3.0.45.101 5.3.0.46.102
2020-04-06 21:08:49 status half-configured linux-image-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:49 status unpacked linux-image-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:49 status half-installed linux-image-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:49 status half-installed linux-image-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:49 status unpacked linux-image-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:08:49 status unpacked linux-image-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:08:49 install linux-headers-5.3.0-46:all <none> 5.3.0-46.38~18.04.1
2020-04-06 21:08:49 status half-installed linux-headers-5.3.0-46:all 5.3.0-46.38~18.04.1
2020-04-06 21:08:51 status unpacked linux-headers-5.3.0-46:all 5.3.0-46.38~18.04.1
2020-04-06 21:08:51 status unpacked linux-headers-5.3.0-46:all 5.3.0-46.38~18.04.1
2020-04-06 21:08:51 install linux-headers-5.3.0-46-generic:amd64 <none> 5.3.0-46.38~18.04.1
2020-04-06 21:08:51 status half-installed linux-headers-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:52 status unpacked linux-headers-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:52 status unpacked linux-headers-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:52 upgrade linux-headers-generic-hwe-18.04:amd64 5.3.0.45.101 5.3.0.46.102
2020-04-06 21:08:52 status half-configured linux-headers-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:52 status unpacked linux-headers-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:52 status half-installed linux-headers-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:52 status half-installed linux-headers-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:52 status unpacked linux-headers-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:08:52 status unpacked linux-headers-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:08:52 upgrade linux-libc-dev:amd64 4.15.0-91.92 4.15.0-96.97
2020-04-06 21:08:52 status half-configured linux-libc-dev:amd64 4.15.0-91.92
2020-04-06 21:08:52 status unpacked linux-libc-dev:amd64 4.15.0-91.92
2020-04-06 21:08:53 status half-installed linux-libc-dev:amd64 4.15.0-91.92
2020-04-06 21:08:53 status half-installed linux-libc-dev:amd64 4.15.0-91.92
2020-04-06 21:08:53 status unpacked linux-libc-dev:amd64 4.15.0-96.97
2020-04-06 21:08:53 status unpacked linux-libc-dev:amd64 4.15.0-96.97
2020-04-06 21:08:53 upgrade linux-signed-generic-hwe-18.04:amd64 5.3.0.45.101 5.3.0.46.102
2020-04-06 21:08:53 status half-configured linux-signed-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:53 status unpacked linux-signed-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:53 status half-installed linux-signed-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:53 status half-installed linux-signed-generic-hwe-18.04:amd64 5.3.0.45.101
2020-04-06 21:08:53 status unpacked linux-signed-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:08:53 status unpacked linux-signed-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:08:53 startup packages configure
2020-04-06 21:08:53 configure linux-modules-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1 <none>
2020-04-06 21:08:53 status unpacked linux-modules-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:53 status half-configured linux-modules-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:53 status installed linux-modules-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:53 configure linux-headers-5.3.0-46:all 5.3.0-46.38~18.04.1 <none>
2020-04-06 21:08:53 status unpacked linux-headers-5.3.0-46:all 5.3.0-46.38~18.04.1
2020-04-06 21:08:53 status half-configured linux-headers-5.3.0-46:all 5.3.0-46.38~18.04.1
2020-04-06 21:08:53 status installed linux-headers-5.3.0-46:all 5.3.0-46.38~18.04.1
2020-04-06 21:08:53 configure linux-libc-dev:amd64 4.15.0-96.97 <none>
2020-04-06 21:08:53 status unpacked linux-libc-dev:amd64 4.15.0-96.97
2020-04-06 21:08:53 status half-configured linux-libc-dev:amd64 4.15.0-96.97
2020-04-06 21:08:53 status installed linux-libc-dev:amd64 4.15.0-96.97
2020-04-06 21:08:53 configure linux-image-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1 <none>
2020-04-06 21:08:53 status unpacked linux-image-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:53 status half-configured linux-image-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:54 status installed linux-image-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:54 status triggers-pending linux-image-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:54 configure linux-modules-extra-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1 <none>
2020-04-06 21:08:54 status unpacked linux-modules-extra-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:54 status half-configured linux-modules-extra-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:54 status installed linux-modules-extra-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:54 configure linux-headers-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1 <none>
2020-04-06 21:08:54 status unpacked linux-headers-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:08:54 status half-configured linux-headers-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:09:45 status installed linux-headers-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:09:45 configure linux-headers-generic-hwe-18.04:amd64 5.3.0.46.102 <none>
2020-04-06 21:09:45 status unpacked linux-headers-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 status half-configured linux-headers-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 status installed linux-headers-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 configure linux-image-generic-hwe-18.04:amd64 5.3.0.46.102 <none>
2020-04-06 21:09:45 status unpacked linux-image-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 status half-configured linux-image-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 status installed linux-image-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 configure linux-generic-hwe-18.04:amd64 5.3.0.46.102 <none>
2020-04-06 21:09:45 status unpacked linux-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 status half-configured linux-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 status installed linux-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 configure linux-signed-generic-hwe-18.04:amd64 5.3.0.46.102 <none>
2020-04-06 21:09:45 status unpacked linux-signed-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 status half-configured linux-signed-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 status installed linux-signed-generic-hwe-18.04:amd64 5.3.0.46.102
2020-04-06 21:09:45 trigproc linux-image-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1 <none>
2020-04-06 21:09:45 status half-configured linux-image-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
2020-04-06 21:10:33 status installed linux-image-5.3.0-46-generic:amd64 5.3.0-46.38~18.04.1
更新之后，每当我运行 Flightgear 时，整个系统似乎都会在几秒后冻结，每次大约 5 秒。
top
除了在 Flightgear 未运行时 Xorg 不时占用 3% 的 CPU 之外，命令 没有显示任何极端可疑的使用情况，但当它运行时，无法识别麻烦制造者，因为整个系统会短时间冻结，而当它恢复时top，会以无法读取的快速序列显示其统计数据。
你知道问题的根源是什么吗？或者如何更好地诊断它？谢谢你的帮助。
编辑 在运行 flightgear 之前
$ sysctl vm.swappiness
vm.swappiness = 60
$ free -h
total used free shared buff/cache available
Mem: 7,7G 2,3G 1,8G 427M 3,6G 4,7G
Swap: 4,0G 0B 4,0G
运行飞行装备时
$ sysctl vm.swappiness
vm.swappiness = 60
$ free -h
total used free shared buff/cache available
Mem: 7,7G 4,2G 452M 618M 3,0G 2,6G
Swap: 4,0G 218M 3,8G
答案1
我创建了一个帐户，只是想说我在 Flightgear 和大约 24 小时前安装的这个新更新中遇到了完全相同的问题。这肯定与更新有关：linux-image-5.3.0-46-generic因为如果我重新启动机器，转到 grub 菜单并选择上一个内核：linux-image-5.3.0-42-generic，一切都会恢复正常，我可以玩 Flightgear。
答案2
我还看到图形性能下降（在 Ubuntu 18.04 上），但主要是在运行 Java 程序时（我实际上并不使用我的电脑玩游戏）。我想知道这是否是 Radeon 显卡特有的，因为我没有在另一台使用相同内核（但 Ubuntu 版本不同：19.10）的机器上看到性能不佳（没有 Radeon 显卡）。以下是显示 Java 图形速度缓慢的机器上的一些输出：
lspci | grep VGA 00:02.0 VGA 兼容控制器：Intel Corporation HD Graphics 530（rev 06） 01:00.0 VGA 兼容控制器：Advanced Micro Devices, Inc. [AMD/ATI] Venus XTX [Radeon HD 8890M / R9 M275X/M375X]（rev 83）
恢复到 5.3.0-45-generic 可以解决问题。
答案3
它现在可以与 Ubuntu 最新的内核升级完美配合
Linux HP 5.3.0-53-generic #47~18.04.1-Ubuntu SMP Thu May 7 13:10:50 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux