Broken APIC on my laptop or bug in FreeBSD?

[Giorgos Keramidas]

On Sat, 19 Jul 2008 17:03:08 -0400, "Alexandre \"Sunny\" Kovalenko" <gaijin.k at gmail.com> wrote:
> On Thu, 2008-07-17 at 21:20 +0300, Giorgos Keramidas wrote:
>> I recently had to replace my dead laptop, and I bought a replacement
>> relatively fast, but something is broken with APIC on this one.
>> 
>> FreeSBIE 2.0.1 (based on 6.2-RELEASE) seems to automatically disable the
>> APIC, using hint.apic.0.disabled="1", so I didn't realize APIC failed to
>> work properly until I dump(8) and restore(8)'d my backup to the new
>> laptop.
>> 
>> After booting with the APIC enabled, I found out that:
>> 
>>   * In single user mode, after `boot -sv', I can keep working without
>>     any major slow down.
>> 
>>   * When I exit single user mode, and a few of the rc.d startup scripts
>>     run, the laptop becomes progressively slower, and eventually crawls
>>     to an unusable state.  I can almost complete logging in as `root' in
>>     ttyv0 but only if I keep furiously moving the mouse around.  If I
>>     don't move the mouse at all, the typed characters may never actually
>>     appear on ttyv0.
>> 
> Are you by any chance using cx_lowest="C3" (or "LOW") in your rc.conf? I
> have seen these symptoms (including mouse inducement of the typed
> characters) when cpu0 on my laptop went to C3. Nowadays I have C3 on
> cpu1 and C2 on cpu0 and life is good. Then again, I am running RELENG_7
> (which AFAICR was 7-CURRENT at the time), so YMMV.

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