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SubjectRe: BIOS bug, APIC version if 0 for CPU#0
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On Tue, 2008-04-22 at 06:10 +0000, Justin Mattock wrote:
> On Tue, Apr 22, 2008 at 5:21 AM, Jacek Luczak <difrost.kernel@gmail.com> wrote:
> > Hi,
> >
> >
> > > Hello;
> > > with the latest git on a macbook the system can barely boot without
> > > freezing, a work around for me at leat is either disable smp, or once
> > > booted turn on glxgears,or compiling the kernel i.g. when using the
> > > processors I'm not receiving a freeze, only when everything starts
> > > lowering down. in dmesg I'm noticing BIOS bug, APIC version is 0 for
> > > CPU#0! fixing up to 0x10. (tell you're hw vendor) could this be the
> > > reason for the system freezes?,
> >
> > I don't think so. On my machine there's no freezes with latest git and:
> > ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
> > BIOS bug, APIC version is 0 for CPU#0! fixing up to 0x10. (tell your hw vendor)
> > ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
> > BIOS bug, APIC version is 0 for CPU#0! fixing up to 0x10. (tell your hw vendor)
> >
> > I've got exactly the same messages.
>
> Are you using a macbook aswell?
>
> >
> >
> > > also I didnt have a camera handy on me
> > > but the screen spit out = Bug spinlock lockup on CPU#0
> > > swapper/0. c17fa7c0 PID 0, comm: swapper not tainted.
> >
> > Can you try to write down more of those bug messages?
>
> Yeah,
>
> >
> >
> > > I dont have a problem disabling smp, except when I cat /proc/cpuinfo I
> > > don't see anything about my cores.
> >
> > What exactly you expect to see in /proc/cpuinfp while smp is disabled?
>
> under smp I see cpu cores. disabling smp I dont see cpu cores, under
> cat /proc/cpuinfo.

well.. SMP is kindof support for multiple processors, be it in one
socket, or multiple sockets.. without SMP you will only be able to use 1
of your X cores.
>
>
> >
> >
> > > I know this is a stupid question
> > > but will it hurt the system if smp is disabled
> > > for the macbook pro ati chipset.?
> >
> > No it won't.
> >
> > -Jacek
> >
>
> Cool as long as the system Is o.k. disabling smp.
It is.. but with the limitations outlined above.
> What about x86: PAT
> support is disabled. how do I enable this option?
> regards;
>



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