Text 2193, 106 rader
Skriven 2011-08-10 03:03:36 av Dariusz Piatkowski
Ärende: Re: Enabling SMP
========================
comp.os.os2.setup.misc,comp.sys.ibm.pc.hardware.chips,comp.os.os2.misc,comp.os.os2.apps

p6864fd6b474ddb5b7e760f849be3b32e6ab8302eb351e43743a085bb8df6af86.newsdawg.com
comp.sys.ibm.pc.hardware.chips:1317 comp.os.os2.misc:3562 comp.os.os2.apps:1872
From: "Dariusz Piatkowski" <dariusz@_NO-SPAM_mnsi.net>

On Tue, 9 Aug 2011 21:36:12 UTC, "Dariusz Piatkowski" 
<dariusz@_NO-SPAM_mnsi.net> wrote:

> Jonathan,
> 
> On Tue, 9 Aug 2011 09:39:25 UTC, Jonathan de Boyne Pollard 
> <J.deBoynePollard-newsgroups@NTLWorld.COM> wrote:
> 
> > >> My machine is NOT configured to support ACPI, however, setting my
> > >> BIOS to ACPI enabled and using MPS map 1.4 seems to produce an
> > >> otherwise pretty darn stable system. [...]
> > >
> > > So you have ACPI disabled even though having it enabled is more stable?
> > 
> > The last time around, M. Piatkowski said APIC, not ACPI.  I pointed out 
> > then that xe shouldn't be mixing up xyr initialisms.  Disabling the 
> > Advanced Configuration and Power Interface is a very different kettle of 
> > fish to disabling any use of Advanced Programmable Interrupt 
> > Controllers.  It's actually the latter that M. Piatkowski is doing.
> > 
> > In an AMIBIOS machine, the setting that M. Piatkowski was talking about 
> > earlier is named "ACPI APIC Support" and it deals with APICs.  In 
> > AWARD-Phoenix firmwares, the equivalent setting is named "APIC Mode". 
> > It almost goes without saying that if one disables the use of APICs 
> > entirely, by setting APIC mode to "disabled", then I/O APICs are as a 
> > consequence unavailable.  If all local APICs are switched off during 
> > POST (as essentially all that this setting has to do), then whatever I/O 
> > APICs may do is entirely irrelevant: there is no-one listening to them.
> 
> Well...you did bring up an excellent point. I had read your original response
to
> my other post and had intended to respond...however I did encounter a 
> soft-freeze and wasn't able to find the posting anymore in my news
reader...???
> 
> So here is the response, hopefully if I used the wrong terminology last time
I 
> am getting it correct this time...I am in fact using the correct terms as 
> applicable to my hardware and in my descriptions I am addressing 2 separate 
> issues:
> 
> 1) ACPI - replacing APM for example
> 2) APIC - dealing with SMP support and things like advanced programmable IO 
> controllers
> 
> In the BIOS of my motherboard, which is the MSI 790X-G45 piece, I do in fact 
> have 2 such separate settings. 
> 
> 1) Enabling ACPI also appears to enable the IOAPIC (that's correct),
disabling 
> ACPI shuts OFF IOAPIC
> 
> 2) SMP related stuff, I believe is really just the MPS table selection of 1.1
or
> 1.4
> 
> What I do not know is how enabling ACPI turns on the IOAPIC and how that in
turn
> relates to supporting SMP in OS2.
> 
> Here is a link to a mb review, and while it's not the matching model, it is
very
> close: MSI 790FX-GD70, the BIOS screenshots are very close (not the same 
> ofcourse for all settings) to what I see for my 790X-G45, 
> http://www.hardocp.com/article/2009/08/04/msi_790fxgd70_amd_motherboard/
> 
> Specifically, this is AMI BIOS and shows the following:
> 
> 1) 
>
http://www.hardocp.com/image.html?image=MTI0NTM3OTE2NFhVdWJNdTV0MzNfMl80X2wuZ2lm

> 
> ...shows the IOAPIC function, it is ONLY present when ACPI has been turned ON
> 
> 2) 
>
http://www.hardocp.com/image.html?image=MTI0NTM3OTE2NFhVdWJNdTV0MzNfMl84X2wuZ2lm

> 
> ...shows the ACPI controls
> 
> OK...so now given that information, I stand by my earlier conclusion...how
does 
> ACPI control the IOAPIC??? Unless, the IOAPIC is only used to support the
ACPI 
> functionality and has absolutely nothing to do with SMP.

...something else which I looked up in the BIOS this time, the description for 
hte IOAPIC says the following:

'Include ACPI APIC table pointer to RSDT pointer list'

Now...does that make sense, and can you shed some light on this? Google is my 
next stop...LOL...

Thanks!

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