Re: RE : Clock is suddently ticking too fast ! [Kernel2.4.19-pre10-ac2, Intel]

Re: RE : Clock is suddently ticking too fast ! [Kernel2.4.19-pre10-ac2, Intel]

[Alan Cox]

On Tue, 2002-11-26 at 20:22, Benoit GRANGE wrote:
> Alan Said:
> > Does this stop if you boot with "noapic" 
> I will try, but the clock frenzy happens only once every full moon...
> it won't be easy to tell.
> By the way, can you refer me to some nice documents explaining what is apic ?
> Regards,
> Benoit Grange

Old IBM PC has PIC (peripheral interrupt controller) - does the 16 IRQ
lines and attaches them to the CPU

Modern PC also as APIC (advanced peripheral interrupt controller) which
is in two parts - locsl apic is on the CPU, and talks over a link to one
or more io-apics that attach to the devices on the bus

"noapic" says to run the box like an old IBM PC

Re: RE : Clock is suddently ticking too fast ! [Kernel2.4.19-pre10-ac2, Intel]

[Rusty Lynch]

> On Tue, 2002-11-26 at 20:22, Benoit GRANGE wrote:
> > Alan Said:
> > > Does this stop if you boot with "noapic"
> > I will try, but the clock frenzy happens only once every full moon...
> > it won't be easy to tell.
> > By the way, can you refer me to some nice documents explaining what is
apic ?
> > Regards,
> > Benoit Grange
>

There is also the "Multiprocessor Specification" that talks about APIC.
You can get to the document from:
http://www.intel.com/design/pentium/datashts/242016.htm

> Old IBM PC has PIC (peripheral interrupt controller) - does the 16 IRQ
> lines and attaches them to the CPU
>
> Modern PC also as APIC (advanced peripheral interrupt controller) which
> is in two parts - locsl apic is on the CPU, and talks over a link to one
> or more io-apics that attach to the devices on the bus
>
> "noapic" says to run the box like an old IBM PC
>
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Re: RE : Clock is suddently ticking too fast ! [Kernel2.4.19-pre10-ac2, Intel]

[Bill Davidsen]

On Wed, 27 Nov 2002, Alan Cox wrote:

> Old IBM PC has PIC (peripheral interrupt controller) - does the 16 IRQ
> lines and attaches them to the CPU
> 
> Modern PC also as APIC (advanced peripheral interrupt controller) which
> is in two parts - locsl apic is on the CPU, and talks over a link to one
> or more io-apics that attach to the devices on the bus

That's interesting, I thought when the first APIC came out it was the one
on the CPU as stood for "Attached Processor Interrupt Controller" to
replace the 8259. Acronym overload? 

> "noapic" says to run the box like an old IBM PC

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.