Shulou(Shulou.com)05/31 Report--

Today, I will talk to you about how to start the virtual machine MP-BIOS bug:8254 timer not connected to IO-APIC in openstack. Many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

When I install redhat5.4 directly on the hard drive, press the ENTER key in the "installation boot interface" and appear:

Enabling IO-APIC IRQs

.. Timer:vector=0X31 apic1=0 pin1=0 apic2=-1 pin2=-1

.. MP-BIOS bug:8254 timer not connected to IO-APIC

... trying to set up timer (IRQ0) through the 8259A...failed.

... trying to set up timer as Virtual Wire IRQ...failed.

Trying to set up timer as EXT INT IRQ...failed: (.

Kernel panic-not syncing:IO-APIC+timer doesn't work! Boot with

Apic=debug and send a report. Then try booting with the "noapic" option.

And then it stopped moving. Stopped before entering the "detect CD Media" interface.

(I also have the same problem when installing with CD)

Method 1: at this time, we can add noapic to the line kernel / vmlinuz in the boot/grub folder in the root directory under the windows system.

Method 2: when you see the boot menu of grub when you install the boot interface, press e, add noapic to the options in the kernel, that is, enter the editing state, press e on the Kernel line, and then move the cursor to the end, if there are two horizontal lines, that is, add noapic just before that, pay attention to separate everything before and after with a space, if there are no two horizontal lines, add it directly to the end, and then press esc to exit the editing state. Press b to start. Method 3: press DEL+CTRL+ALT to restart when this happens, and press Del to enter the BIOS interface, go to the APIC option under POWER, change it to DISABLED, and then restart to install it. However, if you change this parameter, you will not be able to start the Windows system, so you have to change the value to the original ENABLED value. ) if such a problem still occurs at startup after installation, the system will also be booted and entered normally through method 2 and method 3 above. Enter the kernel kernel of / boot/grub/menu.lst to add the option noapic at the end of the line. (there should be spaces between all options) restart after you have modified it. There should be no problem.

Note: the APIC option in POWER in DIOS, remember to change its value to the original ENABLED.

Note: the use method of this test is 2, which can run normally after modification.

After reading the above, do you have any further understanding of what to do when MP-BIOS bug:8254 timer not connected to IO-APIC appears when starting a virtual machine in openstack? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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