| View previous topic :: View next topic |
| Author |
Message |
nemesis01
n00b
Joined: 19 May 2005
Posts: 52
|
 Posted: Fri May 27, 2005 2:37 pm Post subject: Local APIC?? |
 |
|
| Code: |
#dmesg | grep APIC
Local APIC disabled by BIOS -- you can enable it with "lapic"
mapped APIC to ffffd000 (01240000)
Local APIC not detected. Using dummy APIC emulation. |
I saw this message in dmesg, so I enabled APIC in my bios. I do however still get this message. What is this all about?
I did some quick searching and found:
| Quote: |
Pass "lapic" to the kernel in GRUB!
i.e.
title RTAI3.2-test2, kernel 2.6.9 GCC-4.0
root (hd0,0)
kernel /boot/vmlinuz-2.6.9-adeos root=/dev/hda1 ro lapic
savedefault
boot
|
Is this something I should have compiled in to my kernel? Or do I need to pass this like they did?
Any suggestions greatly appreciated.
- Nemesis |
|
| Back to top |
|
 |
NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54848
Location: 56N 3W
|
| Posted: Fri May 27, 2005 3:19 pm Post subject: |
|
|
nemesis01,
There is an option in the Kernel for APIC use. Its in the same menu as Processor Type.
You need to say yes or teh kernel will use the old PIC code.
Look in /proc/interrups, entries with XT-PIC mean you are not useing the APIC.
I need to fix mine now too!
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
|
| Back to top |
|
|
nemesis01
n00b
Joined: 19 May 2005
Posts: 52
|
| Posted: Fri May 27, 2005 4:44 pm Post subject: looking... |
|
|
NeddySeagoon,
Thanks for your help again! I can't seem to find the menu item, doh.
| Code: | /proc/interrupts
CPU0
0: 1314783 XT-PIC timer
1: 8 XT-PIC i8042
2: 0 XT-PIC cascade
7: 0 XT-PIC parport0
9: 0 XT-PIC acpi, uhci_hcd
10: 4770 XT-PIC Intel 82801AA-ICH, eth0
11: 6441 XT-PIC ide1, ide2
14: 11 XT-PIC ide0
NMI: 0
LOC: 1314799
ERR: 0
MIS: 0
|
I added the lpaic to my grub.conf to see what it does. The result:
| Code: | # dmesg | grep -i apic
Kernel command line: root=/dev/md0 lapic
Local APIC disabled by BIOS -- reenabling.
Found and enabled local APIC!
mapped APIC to ffffd000 (fee00000)
|
I am getting this XT-PIC still though. I must need to enable that menu item you were speaking of. Can you give me driving directions to it?
Thanks so much.
-Nemesis01[/quote] |
|
| Back to top |
|
|
NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54848
Location: 56N 3W
|
| Posted: Fri May 27, 2005 8:15 pm Post subject: |
|
|
nemesis01,
Its in | Code: | | Processor type and features |
, where you want to choose
| Code: | | Local APIC support on uniprocessors |
and its subooption | Quote: | | IO-APIC support on uniprocessors |
Just above it are and which are both Good Things
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
|
| Back to top |
|
|
nemesis01
n00b
Joined: 19 May 2005
Posts: 52
|
| Posted: Sat May 28, 2005 2:04 am Post subject: Thats wierd... I don't seem to have it. |
|
|
This is my processor type and features:
| Code: | Subarchitecture Type (PC-compatible) ---> │ │
│ │ Processor family (Pentium-III/Celeron(Coppermine)/Pentium-III Xeon) --│ │
│ │[ ] Generic x86 support │ │
│ │[*] HPET Timer Support │ │
│ │[*] Symmetric multi-processing support │ │
│ │(8) Maximum number of CPUs (2-255) │ │
│ │[*] SMT (Hyperthreading) scheduler support │ │
│ │[*] Preemptible Kernel │ │
│ │[*] Preempt The Big Kernel Lock │ │
│ │[*] Machine Check Exception │ │
│ │<*> Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4 │ │
│ │[*] check for P4 thermal throttling interrupt. │ │
│ │< > Toshiba Laptop support │ │
│ │< > Dell laptop support │ │
│ │< > /dev/cpu/microcode - Intel IA32 CPU microcode support │ │
│ │< > /dev/cpu/*/msr - Model-specific register support │ │
│ │< > /dev/cpu/*/cpuid - CPU information support │ │
│ │ Firmware Drivers ---> │ │
│ │ High Memory Support (off) ---> │ │
│ │[ ] Math emulation │ │
│ │[*] MTRR (Memory Type Range Register) support │ │
│ │[ ] Boot from EFI support (EXPERIMENTAL) │ │
│ │[*] Enable kernel irq balancing │ │
│ │[ ] Use register arguments (EXPERIMENTAL) │ │
│ │ │ │
|
I am using the linux-2.6.11-gentoo-r9 kernel. Could it be that my system just doesn't support it? I am using a semi-old pc. Has the Celeron (Coppermine) 566 Mhz. But cruizes along great as console only server.
-Nemesis |
|
| Back to top |
|
|
steve_d555
Guru
Joined: 07 Nov 2004
Posts: 458
Location: Belmont, Massachusetts
|
| Posted: Sat May 28, 2005 2:41 am Post subject: |
|
|
Disable SMP and HyperThreading and it should show up.
_________________
rubyforums | blog | boxwhore |
|
| Back to top |
|
|
NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54848
Location: 56N 3W
|
| Posted: Sat May 28, 2005 9:56 am Post subject: |
|
|
steve_d555,
With an SMP kernel, APIC support is compulsory, you cannot turn it off, which is why its hidden.
Disabling SMP support on a single CPU box (unless you have Hyperthreading) is a good idea anyway. It gets rid of some code thats not required.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
|
| Back to top |
|
|
nemesis01
n00b
Joined: 19 May 2005
Posts: 52
|
| Posted: Sat May 28, 2005 1:02 pm Post subject: Enbaled, complied, cp |
|
|
I still get XT-PIC.... could it be the comp is just not so good?
-Nemesis01 |
|
| Back to top |
|
|
NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54848
Location: 56N 3W
|
| Posted: Sat May 28, 2005 1:16 pm Post subject: |
|
|
nemesis01,
Your CPU needs to support APIC for it to work.
I still get XT-PIC on one boc and APIC on another and I don't know why yet.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
|
| Back to top |
|
|
|
Kernel & Hardware
