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From: "Grover, Andrew" <andrew.grover@intel.com>
To: James Wright <james@jigsawdezign.com>
Cc: "Nakajima, Jun" <jun.nakajima@intel.com>, linux-kernel@vger.kernel.org
Subject: RE: P4 3.06Ghz Hyperthreading with 2.4.20?
Date: Thu, 20 Mar 2003 14:32:00 -0800
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> From: James Wright [mailto:james@jigsawdezign.com] 
> ACPI: Local APIC address 0xfee00000
> ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
> Processor #0 Pentium 4(tm) XEON(tm) APIC version 16
> ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
> Processor #1 Pentium 4(tm) XEON(tm) APIC version 16

There should be some messages about IO APICs right here. To be SMP, you
need IO APICs.

If you did the ACPI cpu enumeration only, please try the full ACPI
support. That is the only reason I can think of (except for !CONFIG_SMP)
as to why the IO APIC(s) could be overlooked.

> Kernel command line: BOOT_IMAGE=linux ro root=302 acpismp=force

Don't need acpismp=force, btw. With the patch off sf.net it is on by
default - you can use acpi=off to disable it, though. ;-)

Regards -- Andy

> On Thu, 20 Mar 2003 09:11:10 -0800
> "Grover, Andrew" <andrew.grover@intel.com> wrote:
> 
> > > From: James Wright [mailto:james@jigsawdezign.com] 
> > >    So i can apply the ACPI patch to 2.4.20, and it will work, 
> > > even though my motherboard BIOS
> > > doesn't provide the MPS table?
> > 
> > Yes, because ACPI uses a different table.
> > 
> > > Do i still need to use 
> > > "acpismp=force" option?
> > 
> > Nope.
> > 
> > > What do you mean
> > > by *configuring* acpi
> > 
> > Configuring it into your kernel, presumably, using make menuconfig.
> > 
> > > do i need the "acpid" or other 
> > > resources, than just enabling it?
> > 
> > Nope, all the SMP detection stuff is in the kernel.
> > 
> > Regards -- Andy
> > 
> > > 
> > > Thanks,
> > > James
> > > 
> > > 
> > > On Wed, 19 Mar 2003 18:50:59 -0800
> > > "Nakajima, Jun" <jun.nakajima@intel.com> wrote:
> > > 
> > > > You need to apply the ACPI patch: 
> > > http://sourceforge.net/projects/acpi and *configure* APIC. 
> > > > 
> > > > The 2.4 kernel depends on the MPS table for all but logical 
> > > processors. If MPS table is not present, it will fall back to UP.
> > > > 
> > > > Thanks,
> > > > Jun
> > > > 
> > > > > -----Original Message-----
> > > > > From: James Wright [mailto:james@jigsawdezign.com]
> > > > > Sent: Wednesday, March 19, 2003 5:34 PM
> > > > > To: linux-kernel@vger.kernel.org
> > > > > Subject: P4 3.06Ghz Hyperthreading with 2.4.20?
> > > > > 
> > > > > Hello,
> > > > > 
> > > > >    I have kernel 2.4.20 with a single P4 3.06Ghz CPU and 
> > > Asus P4G8X
> > > > > motherboard
> > > > > (with the Intel E7205) Chipset. I have enabled 
> > > Hyperthreading in the BIOS
> > > > > options,
> > > > > compiled in SMP & ACPI support, and also tried adding 
> > > "acpismp=force" to
> > > > > my lilo
> > > > > kernel cmdline, but it just doesn't seem to detect the 
> > > second Logical CPU.
> > > > > My
> > > > > current theory is that this is bcos Linux expects the 
> > > motherboard to be an
> > > > > SMP
> > > > > item (as with the Xeon boards) but this board is a Single 
> > > processor board,
> > > > > ansd
> > > > > doesn't have an MP table, but the cpu info is held in the 
> > > ACPI tables.?!?
> > > > > 
> > > > > I have tried installing 2.5.65 but can't get past the 
> > > compile due to
> > > > > compile-time
> > > > > errors... Is this a known problem? SHall i just disable 
> > > Hyperthreading
> > > > > until a new
> > > > > kernel release?
> > > > > 
> > > > > 
> > > > > Thanks,
> > > > > James
> > > > > 
> > > > > 
> > > > > 
> > > > > -
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