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SubjectRe: 2.4.5-ac6 and 2.4.4-ac11 boot fails with APIC timer
On Sat, 16 Jun 2001 11:27:53 +0900, <root@norma.kjist.ac.kr> wrote:

>> The message on the screen
>>
>> calibrating APIC timer .....
>> .... CPU clock speed is 1395.7390MHz
>> ... host bus clock speed is 0.0000 MHz
>> cpu: 0, clocks: 0, slic: 0
>>
>> Then nothing. I had to push the reset button at this point.
>> ACPI and APM were disabled from the kernel config.
>>
>> This boot failure messages was obtained from
>> Pentium4 board GB-450(?) from Intel, NVIDIA M64 video.
>> Sound Blaster 128 PCI. Netgear PNIC fast ethernet....
>>
>> The same kernel was able to boot up the other Pentium 4 board from
>> Gigabyte flawlessly. So, it depends on the motherboard manufacturers.
>>
>> Regards to all.
>>
>> G. Hugh Song
>
>Replying to my own message:
>
>When I chose "No" to "APIC support on uniprocessors", the above error
>message disappeared and the machine booted up OK with 2.4.5-ac13.
>...
>I think that APIC thing was defined by Intel themselves.
>They should have implemented it the best. How much penalty do I pay
>by not choosing "yes" to "APIC support on uniprocessors"?

From the part of the dmesg log you quoted I conclude that
(a) the NMI watchdog didn't kill you (good), but
(b) the calibration loop detects a 0MHz bus speed and then fails
to produce the "CPU0:<T0: ...>" line, which means it hangs in
arch/i386/kernel/apic.c:setup_APIC_timer(), probably because
apic_read(APIC_TMCCT) always returns zero.

Anyway, you should disable CONFIG_X86_UP_APIC on your P4 for now.
You won't lose any performance due to this, only the possibility to
use the NMI watchdog.

/Mikael
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