[gentoo-user] vanilla-source-2.6.12.5 Xeon EM64T + SMP

[gentoo-user] vanilla-source-2.6.12.5 Xeon EM64T + SMP

[Chris Ong]

Hi Friends,
	I am having a machine with 2 x Xeon 2.8Ghz w/HT/EM64T.

	I am using the minimal-amd64 iso to boot up and install the machine and 
it's a sucess.

	But there's a doubt here..
	
	During the installation stage, the kernel provided with the Minimal CD 
will actually tell 4 CPU. Correct as Real CPU + HT CPU. But when I 
booted the machine with my own kernel. It shows only 2. Here's the 
extraction of config.gz

# Processor type and features
#
# CONFIG_MK8 is not set
CONFIG_MPSC=y
# CONFIG_GENERIC_CPU is not set
CONFIG_X86_L1_CACHE_BYTES=128
CONFIG_X86_L1_CACHE_SHIFT=7
CONFIG_X86_TSC=y
CONFIG_X86_GOOD_APIC=y
# CONFIG_MICROCODE is not set
# CONFIG_X86_MSR is not set
# CONFIG_X86_CPUID is not set
CONFIG_X86_HT=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_MTRR=y
CONFIG_SMP=y
CONFIG_PREEMPT=y
CONFIG_PREEMPT_BKL=y
CONFIG_SCHED_SMT=y
# CONFIG_K8_NUMA is not set
# CONFIG_NUMA_EMU is not set
# CONFIG_NUMA is not set
CONFIG_HAVE_DEC_LOCK=y
CONFIG_NR_CPUS=4
CONFIG_HPET_TIMER=y
# CONFIG_HPET_EMULATE_RTC is not set
# CONFIG_GART_IOMMU is not set
CONFIG_DUMMY_IOMMU=y
CONFIG_X86_MCE=y
CONFIG_X86_MCE_INTEL=y
CONFIG_SECCOMP=y
CONFIG_GENERIC_HARDIRQS=y
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_ISA_DMA_API=y

	I have the same problem before when I try to compile kernel-2.6.12.5 in 
FC4 with a P4 3.0 w/HT. I also lost the virtual CPU.

	Did the kernel-2.6.12.5 treat HT CPU differently ?

	I hope I can find the answer in the kernel changelog. But it's quite 
impossible for me right now. Any ideas ?

---
Regards,
C. K. Ong (Chris)
Linux System Engineer
RHCT Cert No: 603004347692007
http://www.redhat.com/rhce/rhce603004347692007.html

My Directory Sdn. Bhd.
Your Open Source Partner.
http://www.md.com.my http://www.net.my
2005

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Re: [gentoo-user] vanilla-source-2.6.12.5 Xeon EM64T + SMP

[gentuxx]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Chris Ong wrote:

> Hi Friends,
> I am having a machine with 2 x Xeon 2.8Ghz w/HT/EM64T.
>
> I am using the minimal-amd64 iso to boot up and install the
> machine and it's a sucess.
>
> But there's a doubt here..
>
> During the installation stage, the kernel provided with the
> Minimal CD will actually tell 4 CPU. Correct as Real CPU + HT CPU.
> But when I booted the machine with my own kernel. It shows only 2.
> Here's the extraction of config.gz
>
> # Processor type and features
> #
> # CONFIG_MK8 is not set
> CONFIG_MPSC=y
> # CONFIG_GENERIC_CPU is not set
> CONFIG_X86_L1_CACHE_BYTES=128
> CONFIG_X86_L1_CACHE_SHIFT=7
> CONFIG_X86_TSC=y
> CONFIG_X86_GOOD_APIC=y
> # CONFIG_MICROCODE is not set
> # CONFIG_X86_MSR is not set
> # CONFIG_X86_CPUID is not set
> CONFIG_X86_HT=y
> CONFIG_X86_IO_APIC=y
> CONFIG_X86_LOCAL_APIC=y
> CONFIG_MTRR=y
> CONFIG_SMP=y
> CONFIG_PREEMPT=y
> CONFIG_PREEMPT_BKL=y
> CONFIG_SCHED_SMT=y
> # CONFIG_K8_NUMA is not set
> # CONFIG_NUMA_EMU is not set
> # CONFIG_NUMA is not set
> CONFIG_HAVE_DEC_LOCK=y
> CONFIG_NR_CPUS=4
> CONFIG_HPET_TIMER=y
> # CONFIG_HPET_EMULATE_RTC is not set
> # CONFIG_GART_IOMMU is not set
> CONFIG_DUMMY_IOMMU=y
> CONFIG_X86_MCE=y
> CONFIG_X86_MCE_INTEL=y
> CONFIG_SECCOMP=y
> CONFIG_GENERIC_HARDIRQS=y
> CONFIG_GENERIC_IRQ_PROBE=y
> CONFIG_ISA_DMA_API=y
>
> I have the same problem before when I try to compile
> kernel-2.6.12.5 in FC4 with a P4 3.0 w/HT. I also lost the virtual CPU.
>
> Did the kernel-2.6.12.5 treat HT CPU differently ?
>
> I hope I can find the answer in the kernel changelog. But it's
> quite impossible for me right now. Any ideas ?
>
> ---
> Regards,
> C. K. Ong (Chris)
> Linux System Engineer
> RHCT Cert No: 603004347692007
> http://www.redhat.com/rhce/rhce603004347692007.html
>
> My Directory Sdn. Bhd.
> Your Open Source Partner.
> http://www.md.com.my http://www.net.my
> 2005
>
I'm running a P4 3.0GHz w/ HT and it works fine for me.  Here's what
is in my config, that's not in yours:

CONFIG_X86_PC=y
CONFIG_MPENTIUM4=y
CONFIG_X86_GENERIC=y
CONFIG_X86_CMPXCHG=y
CONFIG_X86_XADD=y
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_HPET_EMULATE_RTC=y
CONFIG_NR_CPUS=8
CONFIG_X86_MCE_NONFATAL=y
CONFIG_X86_MCE_P4THERMAL=y
CONFIG_MICROCODE=m
CONFIG_X86_MSR=m
CONFIG_X86_CPUID=m

None of that seems like it would would make a difference, except
perhaps the processor identification.  If you don't tell the kernel
what type of processor it's using (i.e. by just leaving it generic) it
won't know to enable hyperthreading.....

HTH

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