![Ubuntu 内核启动非常慢 - 时间跳过“raid6: sse2x1 gen() 858 MB/s”](https://linux22.com/image/914154/Ubuntu%20%E5%86%85%E6%A0%B8%E5%90%AF%E5%8A%A8%E9%9D%9E%E5%B8%B8%E6%85%A2%20-%20%E6%97%B6%E9%97%B4%E8%B7%B3%E8%BF%87%E2%80%9Craid6%3A%20sse2x1%20gen()%20858%20MB%2Fs%E2%80%9D.png)
有这个时间跳过期间内核启动:
Jul 19 14:07:02 deetabokkusu kernel: [ 2.874776] hub 1-1.4:1.0: USB hub found
Jul 19 14:07:02 deetabokkusu kernel: [ 2.877993] hub 1-1.4:1.0: 4 ports detected
Jul 19 14:07:02 deetabokkusu kernel: [ 94.080339] raid6: sse2x1 gen() 858 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [ 94.128306] raid6: sse2x1 xor() 2371 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [ 94.176324] raid6: sse2x2 gen() 1730 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [ 94.224328] raid6: sse2x2 xor() 2816 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [ 94.272285] raid6: sse2x4 gen() 2430 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [ 94.320302] raid6: sse2x4 xor() 2333 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [ 94.323121] raid6: using algorithm sse2x4 gen() 2430 MB/s
Jul 19 14:07:02 deetabokkusu kernel: [ 94.325949] raid6: .... xor() 2333 MB/s, rmw enabled
Jul 19 14:07:02 deetabokkusu kernel: [ 94.328762] raid6: using ssse3x2 recovery algorithm
Jul 19 14:07:02 deetabokkusu kernel: [ 94.335698] xor: measuring software checksum speed
Jul 19 14:07:02 deetabokkusu kernel: [ 94.376549] prefetch64-sse: 7668.000 MB/sec
Jul 19 14:07:02 deetabokkusu kernel: [ 94.416564] generic_sse: 6661.000 MB/sec
Jul 19 14:07:02 deetabokkusu kernel: [ 94.419385] xor: using function: prefetch64-sse (7668.000 MB/sec)
Jul 19 14:07:02 deetabokkusu kernel: [ 94.426733] async_tx: api initialized (async)
Jul 19 14:07:02 deetabokkusu kernel: [ 94.555496] Btrfs loaded, crc32c=crc32c-intel
systemd-analyze
返回:
Startup finished in 1min 34.896s (kernel) + 38.914s (userspace) = 2min 13.810s graphical.target reached after 5.169s in userspace
systemd-analyze blame
返回:
25.913s apt-daily.service 9.181s apt-daily-upgrade.service 2.131s dev-sda2.device 1.325s snapd.service 729ms media-duraibu1.mount 717ms networkd-dispatcher.service
我是不是在系统上运行 RAID。我需要做哪些更改才能使内核启动得更快?
编辑:
我感兴趣的是内核启动时间的1 分 34.896 秒。我知道如何利用提供给我的信息来改善 38.914 秒的用户空间启动时间systemd-analyze blame
。
编辑2: 使用其他两个 LTS 内核(v4.19.59 和 v4.14.133)启动并没有改变问题