主页 / ubuntu / 问题 / 22913
Accepted
M. Tibbits
Asked: 2011-01-24 07:34:47 +0800 CST

内核消息“CPU0 attaching NULL sched-domain.”是什么意思？

  • 772

问题：这个 dmesg 是什么意思？不好吗？有一个两年前的帖子关于这如何意味着 I/O 性能下降，这可能是/这仍然是真的吗？

背景：我一直在经历 I/O 降级，但我将此归因于使用主板上的内置 RAID 而不是专用卡。我一直在追踪一些随机的内核消息，现在我已经切换到我的桌面——更多的是出于好奇。盒子有一个英特尔酷睿 i7 930 处理器。以下消息有规律地出现。我正在运行 openPBS，如果这很重要的话。但这些消息在系统重新启动后的过去一天半内出现了六次。

的输出uname -a是：

Linux ###### 2.6.32-26-generic #48-Ubuntu SMP Wed Nov 24 10:14:11 UTC 2010 x86_64 GNU/Linux

来自的消息dmesg是：

[  185.609169] CPU0 attaching NULL sched-domain.
[  185.609173] CPU1 attaching NULL sched-domain.
[  185.609175] CPU2 attaching NULL sched-domain.
[  185.609176] CPU3 attaching NULL sched-domain.
[  185.609178] CPU4 attaching NULL sched-domain.
[  185.609179] CPU5 attaching NULL sched-domain.
[  185.609180] CPU6 attaching NULL sched-domain.
[  185.609182] CPU7 attaching NULL sched-domain.
[  185.756764] CPU0 attaching sched-domain:
[  185.756766]  domain 0: span 0,7 level SIBLING
[  185.756768]   groups: 0 (cpu_power = 589) 7 (cpu_power = 589)
[  185.756772]   domain 1: span 0-7 level MC
[  185.756773]    groups: 0,7 (cpu_power = 1178) 1,4 (cpu_power = 1178) 2,5 (cpu_power = 1178) 3,6 (cpu_power = 1178)
[  185.756780] CPU1 attaching sched-domain:
[  185.756781]  domain 0: span 1,4 level SIBLING
[  185.756782]   groups: 1 (cpu_power = 589) 4 (cpu_power = 589)
[  185.756786]   domain 1: span 0-7 level MC
[  185.756787]    groups: 1,4 (cpu_power = 1178) 2,5 (cpu_power = 1178) 3,6 (cpu_power = 1178) 0,7 (cpu_power = 1178)
[  185.756793] CPU2 attaching sched-domain:
[  185.756794]  domain 0: span 2,5 level SIBLING
[  185.756795]   groups: 2 (cpu_power = 589) 5 (cpu_power = 589)
[  185.756799]   domain 1: span 0-7 level MC
[  185.756800]    groups: 2,5 (cpu_power = 1178) 3,6 (cpu_power = 1178) 0,7 (cpu_power = 1178) 1,4 (cpu_power = 1178)
[  185.756806] CPU3 attaching sched-domain:
[  185.756807]  domain 0: span 3,6 level SIBLING
[  185.756808]   groups: 3 (cpu_power = 589) 6 (cpu_power = 589)
[  185.756812]   domain 1: span 0-7 level MC
[  185.756813]    groups: 3,6 (cpu_power = 1178) 0,7 (cpu_power = 1178) 1,4 (cpu_power = 1178) 2,5 (cpu_power = 1178)
[  185.756819] CPU4 attaching sched-domain:
[  185.756820]  domain 0: span 1,4 level SIBLING
[  185.756821]   groups: 4 (cpu_power = 589) 1 (cpu_power = 589)
[  185.756825]   domain 1: span 0-7 level MC
[  185.756826]    groups: 1,4 (cpu_power = 1178) 2,5 (cpu_power = 1178) 3,6 (cpu_power = 1178) 0,7 (cpu_power = 1178)
[  185.756832] CPU5 attaching sched-domain:
[  185.756833]  domain 0: span 2,5 level SIBLING
[  185.756834]   groups: 5 (cpu_power = 589) 2 (cpu_power = 589)
[  185.756838]   domain 1: span 0-7 level MC
[  185.756839]    groups: 2,5 (cpu_power = 1178) 3,6 (cpu_power = 1178) 0,7 (cpu_power = 1178) 1,4 (cpu_power = 1178)
[  185.756845] CPU6 attaching sched-domain:
[  185.756846]  domain 0: span 3,6 level SIBLING
[  185.756847]   groups: 6 (cpu_power = 589) 3 (cpu_power = 589)
[  185.756850]   domain 1: span 0-7 level MC
[  185.756852]    groups: 3,6 (cpu_power = 1178) 0,7 (cpu_power = 1178) 1,4 (cpu_power = 1178) 2,5 (cpu_power = 1178)
[  185.756858] CPU7 attaching sched-domain:
[  185.756859]  domain 0: span 0,7 level SIBLING
[  185.756860]   groups: 7 (cpu_power = 589) 0 (cpu_power = 589)
[  185.756863]   domain 1: span 0-7 level MC
[  185.756865]    groups: 0,7 (cpu_power = 1178) 1,4 (cpu_power = 1178) 2,5 (cpu_power = 1178) 3,6 (cpu_power = 1178)
kernel

2 个回答

  1. Best Answer

    该消息只是告诉您 CPU 内核正在初始化为空域。如果您愿意，您可以关闭消息，但它不会损害您的 I/O。

    您可以使用它iostat来查找 IO 中的问题以及该错误中发生的情况。

    如果可以，请安装ubuntu-desktop软件包，注销并登录 gnome，看看您是否遇到同样的问题。这会将 kio 和 kthread 问题与系统范围的 io 问题分开。在两者上运行测试。

    • 2

  2. 在显式禁用和启用 CPU 内核后，我的日志中出现了相同的消息：

    echo 0 > /sys/devices/system/cpu/cpu6/online
echo 1 > /sys/devices/system/cpu/cpu6/online

    我的建议是，如果您收到此消息，请尝试按上述方式循环禁用和启用 CPU 内核。

    • 0

相关问题