MP-BIOS bug: 8254 timer not connected to IO-APIC
Hi all,
The "MP-BIOS bug: 8254 timer not connected to IO-APIC" error message shows up on boot on at least one of my RHEL servers, and I'm not quite sure what to make of it. My understanding of the situation is that the timer is located elsewhere on the motherboard than where the kernel looks for it. Is this correct? I've come across people suggestin one should disable APIC by adding "noapic" to the kernel boot options, but which consequences does this imply - in SNP setups only one CPU will be used by the kernel? Best regards, kenneho PS. I posted this question on a RHEL mailing list, but since I didn't get any replies I'm posting it here too. |
I've gotten this message before, and sometimes it correlates with problems, and other times it doesn't. Does it cause problems ? If not, ignore it.
If it causes problems, first try 'noioapic', this only disables IO-APIC not all of APIC, and causes less side effects. As for side effects of turning off APIC, this may be relevant: http://en.wikipedia.org/wiki/Intel_APIC_Architecture Then, I may try updating the BIOS, seeing that this may indeed be a BIOS bug, but check the BIOS changelog first and see if it mentions something about APIC fixes. If it doesn't it may not be worth it. |
Quote:
- kenneho |
All times are GMT -5. The time now is 07:11 PM. |